THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/10/05 i
THRUSH AIRCRAFT INC.
TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Model S2R – T660
Serial Numbers T660 – 109 & Up
Manual Number: T660 -3
Issued December 17, 2003
Revised January 10, 2005
Note:
All serial numbers with the DC suffix indicate the dual cockpit configuration.
Manufacturer’s Serial Number:_____________________________________________
Registration Number:____________________________________________________
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/10/05 ii
Page
LOG OF PAGES
Date Page
Date
i …………………………… 01/10/05 SECTION II
(
CONT’D
)
ii …………………………… 01/10/05 SERVICING
iii …………………………… 01/10/05 34 ……………………………. 12/17/03
iv …………………………… 01/10/05 35 ……………………………. 12/17/03
v ……………………………. 12/17/03 36 ……………………………
.
12/17/03
vi ……………………………. 01/10/05 37 ……………………………
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12/17/03
vii ……………………………. 12/17/03 38 ……………………………. 12/17/03
SECTION I 39 ……………………………. 12/17/03
GENERAL INFORMATION 40 ……………………………. 12/17/03
1 ……………………………. 12/17/03 41 ……………………………. 12/17/03
2 ……………………………. 12/17/03 42 ……………………………. 12/17/03
3 ……………………………. 12/17/03 43 ……………………………. 12/17/03
4 ……………………………. 12/17/03 44 ……………………………. 12/17/03
5 ……………………………. 12/17/03 45 ……………………………. 12/17/03
6 ……………………………. 01/10/05 46 ……………………………. 12/17/03
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8 ……………………………. 12/17/03 48 ……………………………. 12/17/03
9 ……………………………. 12/17/03 49 ……………………………. 12/17/03
10 ……………………………. 12/17/03 50 ……………………………. 12/17/03
11 ……………………………. 12/17/03 51 ……………………………. 12/17/03
SECTION II 52 ……………………………. 01/10/05
SERVICING 53 ……………………………. 12/17/03
1 ……………………………. 12/17/03
2 ……………………………. 12/17/03 SECTION III
3 ……………………………. 12/17/03 HYDRAULICS
4 ……………………………. 12/17/03 1 ……………………………. 12/17/03
5 ……………………………. 12/17/03 2 ……………………………. 12/17/03
6 ……………………………. 12/17/03 SECTION IV
7 ……………………………. 12/17/03 POWERPLANT &
8 ……………………………. 12/17/03 PROPELLER
9 ……………………………. 12/17/03 1 ……………………………. 12/17/03
10 ……………………………. 12/17/03 2 ……………………………. 09/02/04
11 ……………………………. 12/17/03 3 ……………………………. 12/17/03
12 ……………………………. 12/17/03 4 ……………………………. 12/17/03
13 ……………………………. 12/17/03 5 ……………………………. 12/17/03
14 ……………………………. 12/17/03 6 ……………………………. 12/17/03
15 ……………………………. 12/17/03 7 ……………………………. 12/17/03
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17 ……………………………. 12/17/03 9 ……………………………. 12/17/03
18 ……………………………. 12/17/03 10 ……………………………. 12/17/03
19 ……………………………. 01/10/05 11 ……………………………. 12/17/03
20 ……………………………. 01/10/05 12 ……………………………. 12/17/03
21 ……………………………. 12/17/03 13 ……………………………. 12/17/03
22 ……………………………. 12/17/03 14 ……………………………. 12/17/03
23 ……………………………. 12/17/03 15 ……………………………. 12/17/03
24 ……………………………. 01/10/05 16 ……………………………. 12/17/03
25 ……………………………. 12/17/03 17 ……………………………. 12/17/03
26 ……………………………. 12/17/03 18 ……………………………. 12/17/03
27 ……………………………. 12/17/03 19 ……………………………. 12/17/03
28 ……………………………. 12/17/03 20 ……………………………. 12/17/03
29 ……………………………. 12/17/03 21 ……………………………. 12/17/03
30 ……………………………. 12/17/03 22 ……………………………. 12/17/03
31 ……………………………. 12/17/03 23 ……………………………. 12/17/03
32 ……………………………. 12/17/03 24 ……………………………. 12/17/03
33 ……………………………. 12/17/03 25 ……………………………. 01/10/05
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AIRCRAFT MAINTENANCE MANUAL
Effective: 01/10/05 iii
Page LOG OF PAGES
Date Page Date
SECTION IV
POWER PLANT &
PROPELLER
8
SECTION VI (CONT’D)
LANDING GEAR
……………………………. 12/17/03
26 ……………………………. 01/10/05 9 ……………………………. 12/17/03
27 ……………………………. 12/17/03 10 ……………………………. 12/17/03
28 ……………………………. 12/17/03 11 ……………………………. 12/17/03
29 ……………………………. 12/17/03 12 ……………………………. 12/17/03
30 ……………………………. 12/17/03 13 ……………………………. 12/17/03
31 ……………………………. 12/17/03 14 ……………………………. 12/17/03
32 ……………………………. 01/10/05 15 ……………………………. 12/17/03
33 ……………………………. 12/17/03 16 ……………………………. 12/17/03
34 …………………………… 12/17/03 17 …………………………… 12/17/03
35 …………………………… 12/17/03 18 …………………………… 12/17/03
36 …………………………… 01/10/05 19 …………………………… 01/10/05
37 …………………………… 12/17/03 19a …………………………… 01/10/05
38 …………………………… 12/17/03 20 …………………………… 12/17/03
39 …………………………… 12/17/03 21 …………………………… 12/17/03
40 …………………………… 12/17/03 22 …………………………… 12/17/03
41 ……………………………. 12/17/03 23 …………………………… 12/17/03
42 ……………………………. 12/17/03 SECTION VII
43 ……………………………. 12/17/03 FLIGHT CONTROLS
44 ……………………………. 12/17/03 1 ……………………………. 12/17/03
45 ……………………………. 12/17/03 2 ……………………………. 12/17/03
SECTION V 3 ……………………………. 01/10/05
FUEL SYSTEM 4 ……………………………. 12/17/03
1 ……………………………. 12/17/03 5 ……………………………. 12/17/03
2 ……………………………. 12/17/03 6 ……………………………. 12/17/03
3 ……………………………. 12/17/03 7 ……………………………. 12/17/03
4 ……………………………. 12/17/03 8 ……………………………. 12/17/03
5 ……………………………. 12/17/03 9 ……………………………. 12/17/03
6 …………………………… 12/17/03 10 ……………………………. 12/17/03
7 …………………………… 12/17/03 11 ……………………………. 12/17/03
8 ……………………………. 12/17/03 12 ……………………………. 12/17/03
9 ……………………………. 01/10/05 13 ……………………………. 01/10/05
10 ……………………………. 12/17/03 14 ……………………………. 01/10/05
11 ……………………………. 01/10/05 15 ……………………………. 12/17/03
12 ……………………………. 12/17/03 16 ……………………………. 12/17/03
13 ……………………………. 12/17/03 17 ……………………………. 12/17/03
14 ……………………………. 12/17/03 18 ……………………………. 12/17/03
15 ……………………………. 12/17/03 19 ……………………………. 12/17/03
16 ……………………………. 12/17/03 20 ……………………………. 12/17/03
17 ……………………………. 12/17/03 21 ……………………………. 12/17/03
18 ……………………………. 12/17/03 22 ……………………………. 12/17/03
19 ……………………………. 12/17/03 23 ……………………………. 12/17/03
20 ……………………………. 12/17/03 24 ……………………………. 12/17/03
SECTION VI 25 ……………………………. 12/17/03
LANDING GEAR 26 ……………………………. 12/17/03
1 ……………………………. 01/10/05 27 ……………………………. 12/17/03
2 ……………………………. 12/17/03 28 ……………………………. 12/17/03
3 ……………………………. 01/10/05 29 ……………………………. 12/17/03
4 …………………………… 01/10/05 30 ……………………………. 12/17/03
5 ……………………………... 01/10/05 31 ……………………………. 12/17/03
6 …………………………… 01/10/05 32 …………………………… 12/17/03
6a …………………………….. 01/10/05 33 ……………………………. 12/17/03
7 ……………………………. 12
/
17/03 34 ……………………………. 12/17/03
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/10/05 iv
Page Date Page Date
SECTION VII (CONT’D)
FLIGHT CONTROLS SECTION X (CONT’D)
ELECTRICAL
35 ……………………………. 12/17/03 3 ……………………………. 12/17/03
36 ……………………………. 01/10/05 4 ……………………………. 12/17/03
37 ……………………………. 12/17/03 5 ……………………………. 12/17/03
38 ……………………………. 12/17/03 6 ……………………………. 12/17/03
39 ……………………………. 12/17/03 7 ……………………………. 12/17/03
40 …………………………… 01/10/05 8 ……………………………. 12/17/03
41 …………………………… 01/10/05 9 ……………………………. 12/17/03
SECTION VIII 10 ……………………………. 12/17/03
INSTRUMENTS 11 ……………………………. 12/17/03
1 ……………………………. 12/17/03 12 ……………………………. 12/17/03
2 ……………………………. 12/17/03 13 ……………………………. 12/17/03
3 ……………………………. 12/17/03 14 ……………………………. 12/17/03
4 ……………………………. 12/17/03 15 ……………………………. 12/17/03
5 ……………………………. 12/17/03 16 ……………………………. 12/17/03
6 ……………………………. 12/17/03 17 ……………………………. 12/17/03
7 ……………………………. 12/17/03 18 ……………………………. 12/17/03
8 ……………………………. 12/17/03 19 ……………………………. 12/17/03
9 ……………………………. 12/17/03 20 ……………………………. 12/17/03
10 ……………………………. 12/17/03 21 ……………………………. 12/17/03
11 ……………………………. 12/17/03 22 ……………………………. 12/17/03
12 ……………………………. 12/17/03 23 ……………………………. 12/17/03
13 ……………………………. 12/17/03 24 ……………………………. 12/17/03
14 ……………………………. 12/17/03 25 ……………………………. 12/17/03
15 ……………………………. 12/17/03 26 ……………………………. 12/17/03
16 ……………………………. 12/17/03 27 ……………………………. 12/17/03
17 ……………………………. 12/17/03 28 ……………………………. 12/17/03
18 ……………………………. 12/17/03 29 ……………………………. 12/17/03
19 ……………………………. 12/17/03 30 ……………………………. 12/17/03
20 ……………………………. 12/17/03 31 ……………………………. 12/17/03
21 ……………………………. 12/17/03 32 ……………………………. 12/17/03
22 ……………………………. 12/17/03 33 ……………………………. 12/17/03
23 ……………………………. 12/17/03 34 ……………………………. 12/17/03
24 ……………………………. 12/17/03 35 ……………………………. 12/17/03
25 ……………………………. 12/17/03 36 ……………………………. 12/17/03
26 ……………………………. 12/17/03 37 ……………………………. 12/17/03
SECTION IX 38 ……………………………. 12/17/03
DISPERSAL SYSTEMS 39 ……………………………. 12/17/03
1 ……………………………. 12/17/03 40 ……………………………. 12/17/03
2 ……………………………. 12/17/03 41 ……………………………. 12/17/03
3 ……………………………. 12/17/03 42 ……………………………. 12/17/03
4 ……………………………. 12/17/03 43 ……………………………. 12/17/03
5 ……………………………. 12/17/03 44 ……………………………. 12/17/03
6 ……………………………. 12/17/03 45 ……………………………. 12/17/03
7 ……………………………. 12/17/03 46 ……………………………. 12/17/03
8 ……………………………. 12/17/03 47 ……………………………. 12/17/03
9 ……………………………. 12/17/03 48 ……………………………. 12/17/03
10 ……………………………. 12/17/03 49 ……………………………. 12/17/03
11 ……………………………. 12/17/03 50 ……………………………. 12/17/03
12 ……………………………. 12/17/03 51 ……………………………. 12/17/03
SECTION X 52 ……………………………. 12/17/03
ELECTRICAL 53 ……………………………. 12/17/03
1 ……………………………. 12/17/03
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 12/17/03 vii
INTRODUCTION
This publication provides information for the Thrush Aircraft, Inc. Model S2RT660
Turbo Thrush Aircraft. Installations or equipment will vary from model to model due
to the wide range of optional equipment. The information contained within this
manual is based on data available at the time of publication and will be kept
current by changes or service publications.
This manual contains information on aircraft systems and operating procedures
required for safe and effective maintenance. It shall not be used as a substitute
for sound judgment.
In this manual:
*** WARNING *** -- Indicates a strong possibility of severe personal injury or loss
of life if instructions are not followed.
** CAUTION ** -- Indicates a possibility of personal injury or equipment damage
if instructions are not followed.
* NOTE * -- Gives helpful information.
CAUTION: Detailed descriptions of standard workshop procedures, safety
principles and service operations are NOT included in this manual. Please note
that this manual DOES contain warnings and cautions against some specific
service methods which could cause PERSONAL INJURY or could damage an
aircraft or MAKE IT UNSAFE. Please understand that these warnings cannot cover
all conceivable ways in which service, whether or not recommended by Thrush
Aircraft Inc., might be done or of the possible hazardous consequences of each
conceivable way, nor could Thrush Aircraft Inc. investigate all such ways. Anyone
using service procedures or tools, whether or not recommended by Thrush Aircraft
Inc. must satisfy himself thoroughly that neither personal safety nor aircraft safety
will be jeopardized.
All information contained in this manual is based on the latest product information
available at the time of printing. We reserve the right to make changes at any time
without notice.
THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Section 1
GENERAL INFORMATION
TABLE OF CONTENTS
SECTION ONE.................................................................................................................................1
GENERAL INFORMATION..............................................................................................................2
GENERAL DESCRIPTION...........................................................................................................2
PRINCIPAL DIMENSIONS...........................................................................................................2
GENERAL .................................................................................................................................2
WING.........................................................................................................................................3
HORIZONTAL STABILIZER AND ELEVATORS......................................................................3
VERTICAL STABILIZER AND RUDDER..................................................................................3
AREAS ......................................................................................................................................4
SUPPLIER FURNISHED COMPONENT MANUALS................................................................4
AIRCRAFT STRUCTURES ..........................................................................................................4
FUSELAGE ...............................................................................................................................4
CENTER SECTION...................................................................................................................5
WING.........................................................................................................................................5
EMPENNAGE............................................................................................................................5
COCKPIT...................................................................................................................................6
AIRCRAFT SYSTEMS..................................................................................................................6
HYDRAULIC SYSTEMS ...........................................................................................................6
POWER PLANT & PROPELLER..............................................................................................6
FUEL SYSTEM .........................................................................................................................7
LANDING GEAR, WHEELS & BRAKES...................................................................................8
FLIGHT CONTROLS.................................................................................................................8
INSTRUMENTS ........................................................................................................................8
ELECTRICAL SYSTEM ............................................................................................................9
AIRCRAFT WEIGHT & BALANCE............................................................................................9
FIGURE 1-1 ................................................................................................................................10
FIGURE 1-2 ................................................................................................................................11
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
GENERAL INFORMATION
SECTION ONE
GENERAL DESCRIPTION
The Thrush Aircraft Inc Turbo Thrush is designed especially for agricultural flying. It is a monoplane
featuring a full cantilever low wing and all metal construction. The design and construction of the
airframe components assure all structural integrity, flight safety, and minimum maintenance
requirements. The Turbo Thrush is designed for the highest crash load factors in the industry.
Safety and reliability of operation and maximum pilot crash protection are proven and effective
features of the design. The high strength overturn structure is a proven design. The fuselage and
overturn structure, constructed throughout of chrome-moly steel tubing, is immensely strong in the
cockpit area.
CONTACT INFORMATION
For further information related to this manual, please contact our Product Support Manager at (229)
883-1440.
PRINCIPAL DIMENSIONS
GENERAL
Wing Span Extended Tip 648.0 Inches (54’.00”)
Overall Length 432.9 inches (36' 0.91")
Height To Top Of Canopy 126.0 inches (10' 6.00")
Main Gear Tread 108.7 inches (9' 0.74")
Main Gear To Tail Wheel 274.20 inches (22' 10.20")
Empty Weight Equipped 6,100 pounds minimum
Maximum Weight 14,150 pounds with liquid dispersal equipment installed
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
WING
Type Full Cantilever
Airfoil Section Naca 4412
Dihedral 3.50 Degrees
C. G. Range (See Airplane Flight Manual for pertinent data)
-Fwd Limit 24.5 Inches Aft Of Datum
-Aft Limit 30.0 Inches Aft Of Datum
(Datum Is The Leading Edge Of The Wing.)
Aileron Travel
-Up 21 Degrees ±1 Degree
-Down 17 Degrees ±1 Degree
Flap Travel Down 15 Degrees ±1 Degree
HORIZONTAL STABILIZER AND ELEVATORS
Span 204 Inches (17')
Elevator Travel
-Up 27 Degrees ±1 Degree
-Down 17 Degrees ±1 Degree
Trim Tab Travel
-Up 8 Degrees ±1 Degree
-Down 22 Degrees ±1 Degree
VERTICAL STABILIZER AND RUDDER
Rudder Travel 22 Degrees ±1 Degree
Rudder Trim Tab Travel 0 Degrees to Max 8.6 Degrees Trailing Edge
Left
1 – 3 Effective: 12/17/03
THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
AREAS
Wing 405.0 Square Feet
Aileron (Each) 23.40 Square Feet
Flaps (Each) 26.70 Square Feet
Stabilizer 39.30 Square Feet
Elevators 20.40 Square Feet
Elevator Tabs (Each) 1.30 Square Feet
Fin 10.59 Square Feet on T660-109 and subsequent
Rudder 15.55 Square Feet on T660-109 and subsequent
SUPPLIER FURNISHED COMPONENT MANUALS
MANUAL PART #
PT6A-67AG Maintenance Manual
Vol. I & II 3036132
Parts Manual 3036134
PT6A-60AG Maintenance Manual
Vol. I & II 3034342
Parts Manual 3034344
THIS SPACE INTENTIONALLY LEFT BLANK.
PT6A-45A, PT6A-45B, PT6A-
45R
Maintenance Manual
Vol I & II 3027042
Parts Manual 3027044
Propeller (B5P10120S) Owner’s Manual 139
AIRCRAFT STRUCTURES
FUSELAGE
The fuselage comprises a welded tubular steel frame, fiberglass hopper, and detachable skins. An
overturn structure forms an integral part of the fuselage frame. The frame structure, fittings,
bushings, brackets, and so forth are fabricated from 4130 chrome-moly seamless steel tubing.
As a corrosion preventative, hot linseed oil is pumped throughout the entire welded structure. On an
average, 12 gallons are pumped into the frame and 11 to 11 1/2 gallons drain out, leaving a
residual coating on all members. The exterior of the frame is sandblasted, etched, and primed,
which is followed by two coats of polyurethane paint that is resistant to chemical reaction. The
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
fuselage is covered with heat treated Alclad panels attached with camloc fasteners. Side skins can
be removed using only a screwdriver, thus exposing the fuselage frame for thorough cleaning and
inspection. All skins are supported clear of the fuselage tubing to prevent accumulation of corrosive
chemicals. The seams and lap joints of the skin panel support structure are sealed with a special
compound to eliminate chemical action between the mating surfaces. Each skin panel is etched,
primed, and painted before assembly to insure complete coverage. All lower fuselage skins around
the hopper opening and aft to the tail post are made of stainless steel. The skin fasteners in the
high corrosion areas are also stainless steel.
CENTER SECTION
The Center Section is a constant chord of 90 inches, all metal, and full cantilever design. The
massive main spar is of a one piece design of high strength heat treated steel and machined to
reduce weight. The spar is cad plated, primed and painted. All metal skins and ribs are constructed
from Alclad heat-treated aluminum material. The unit attaches to the fuselage and supports the
wings. WING
The wing is a constant chord of 90 inches, all metal, and full cantilever design. The massive main
spar is a tension field beam structure constructed from Alclad webs and high strength heat-treated
steel caps. All wing skins, ribs, and leading edges are constructed from Alclad heat-treated material.
The leading edge structure is made especially strong to minimize denting and is riveted with
universal rivets for strength. The fuel tanks, which are located in the inboard section of the wing, are
an integral part of the structure. Close pitch riveting of the seams, substantial reinforcement, and
flexible sealants minimize chances of rupture in crash conditions. Drain holes are provided in
adjacent bays to prevent accumulation of fuel in the event of a leak. The ailerons and flaps are all
metal construction and are hinged on ball bearings. The flaps are electrically operated by push rods
and are completely sealed against chemical entry. Flap hinges are stainless steel. For the Model
S2R-T660, the outer wing panel detaches from the center wing panel by removal of four bolts.
EMPENNAGE
The horizontal stabilizer, elevator, rudder and vertical fin are an all-metal structure. All skins, ribs
and leading edges are constructed from alclad material. The movable surfaces are hinged on
sealed bearings that can be easily replaced. The rudder and the elevator have aerodynamic
balances that are protected by overhangs on the fixed surfaces.
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
COCKPIT
The overturn structure is exceptionally strong and welded to "hard points" in the fuselage frame.
The forward bracing supports the windshield support channels and is welded to a lateral tube that is
curved to provide more head clearance. The fiberglass canopy shell has extra thickness on the top
portion and is well attached to the extra large steel tube structure so that it will serve as a skid in
case of overturn. The large canopy doors permit easy entrance to one or both cockpits. The doors
should not be removed for flight, as the aircraft performance will be lowered. The cockpit seat belts
are anchored to the seat structure, and the shoulder harnesses are secured to a steel channel at
the bottom of the seat structure. The seats adjust vertically. The rudder pedals adjust fore and aft.
The windshield is a three-piece construction. The center section is tempered safety plate glass for
better resistance to scratching and is enclosed in a stainless steel frame. The windshield side
panels are Plexiglas and are curved to provide streamlining.
AIRCRAFT SYSTEMS
HYDRAULIC SYSTEMS
The hydraulic system consists of two master cylinders and hydraulic brake lines connecting the
master cylinders to the wheel brake cylinders. Applying toe pressure on the rudder pedals actuates
the master cylinders, which are located just aft of the pilot’s rudder pedals. A small reservoir is
incorporated within each master cylinder to supply the system with brake fluid.
R1
POWER PLANT & PROPELLER
(Refer to manuals listed in Chart on Page 1-4 in this Section.)
The S2R-T660 Turbo Thrush is powered by the PT6, a lightweight free turbine engine incorporating
a reverse flow combustion path, is designed for aircraft propulsion use. It utilizes two counter
rotating turbine sections. One drives the compressor, and the other drives the propeller through a
reduction gearbox. The latter turbine is "free" or independent of the compressor turbine. More
recent and higher-powered models incorporate a two-stage free turbine. The PT6 has been
produced in several models and has been adapted to a multitude of uses.
The propeller has five blades mounted on a hollow hub in the front end of which is a servo-piston
that moves forward under servo-oil pressure or rearward under feather return spring pressure.
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
There are five links from the servo-piston. One goes to each blade root, and these links transmit
forward motion of the servo-piston to the blade roots and pivot the blades in the decrease pitch
direction. When servo-piston pressure is relieved, the servo-piston moves rearward under feather
return spring pressure and pivots the blades in the increase pitch direction. This action is assisted
by centrifugal force of the counterweight on each blade root.
FUEL SYSTEM
A 230-gallon fuel supply is available for the Thrush S2R-T660. In each wing, fuel is contained inside
integral wing tanks (wet wing fuel tanks) just outboard of the center section sub-wings. The left wing
and right wing fuel tanks are interconnected through a 5 U.S. gallon header tank that is located in
the fuselage. The fuel supply lines, to the engine, are routed from the header tanks outlet finger
screen through a fuel shutoff (on/off) valve to an electric driven fuel boost pump. The electric driven
fuel boost pump discharge is then routed through a 25-micron main fuel filter to an engine driven
fuel boost pump. The electric driven fuel boost pump serves two purposes, first as a backup system
to provide continuous fuel pressure to the engines high pressure fuel pump in case the engine
driven fuel boost pump fails and secondly to provide boosted fuel pressure to the engines high
pressure fuel pump during engine starting. The aircraft’s fuel system is equipped with two fuel
filters, a ¼ inch mesh finger strainer is installed in the outlet fitting from the header tank and a 25-
micron, airframe supplied, main fuel filter located on the forward L/H side of the firewall. Fuel from
the aircraft fuel system enters the engines high pressure fuel pump which has two fuel filters, an 74-
micron inlet filter and a 10-micron discharge filter (refer to the engines appropriated maintenance
manual for pertinent maintenance details for the engine supplied filters and fuel system). The fuel
tank vent system is designed to keep the fuel spillage to a minimum. The fuel tanks are vented
through tubing connected at both the inboard and outboard ends of the individual fuel tanks to the
centrally located vent system in the fuselage. Ram air enters a vent scoop, on the fuselage, under
the left wing and pressurizes the vent system to maintain positive pressure on the fuel tanks. The
vent system is provided with two quick drains, located on the fuselage under each wing, to drain
any fuel that might happened to have got in the tanks outboard vent lines. At engine shutdown, fuel
from the flow divider/dump valve, located at the 6 o’clock position on the engines fuel nozzle
manifold, is directed to a residue fuel reservoir “EPA tank” mounted inboard on the L/H aft shin skin.
This reservoir hold approximately 3 engine shutdowns worth of fuel before the fuel will exit the
reservoirs vent system. (NOTE: This reservoir should be emptied after each engine shutdown.)
(NOTE: It is common and normal after an engine compressor Water Wash or Performance
Recovery Wash to have water or soap appear in the reservoirs’ drained waste fuel.) The fuel
quantity gauge is located on the lower left instrument panel. The fuel quantity indicating system
consists of two transmitters, one indicator gauge, and a L/H or R/H tank fuel quantity selector
switch. A transmitter, installed in each wing
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
tank transmits an electrical signal to the single fuel quantity indicator. The instrument reads both the
left and right fuel tanks singularly as chosen by the electrical control switch, adjacent to the fuel
quantity indicator gauge on the instrument panel. The two fuel tanks are serviced through filler ports
located on the top of both wings. The filler ports incorporate security chains to prevent the lost of the
fuel caps. Service the aircraft from refueling facilities that utilize proper ground handling equipment
and filter systems to remove impurities and water accumulations from the bulk fuel. If filtering
facilities are not available, filter the fuel through a quality high-grade chamois. Fuel tanks should be
serviced after the last flight of each day to reduce condensation and allow any entrapped water
accumulations to settle to the fuel system drains, to be removed, prior to the next flight.
Prior to the first flight of the day the header tank and fuel filter should be drained to check for the
presence of water or sediment in the fuel system. If there is a possibility, at any time, that any
tank may contain water, the header tank and fuel filter should be drained as necessary to ensure no
water exists in the fuel system. For fuel system servicing information, refer to Section Two.
LANDING GEAR, WHEELS & BRAKES
The main landing gear is made using a formed chrome-moly spring steel unit. The left Main gear
and the right main gear are symmetrical. The main wheels are 11 x 10. The spring steel
construction and design of the main gear allow for absorption of landing weight and common
stresses associated with such, thus eliminating the need for shock struts. The brake system has
individual toe brakes and individual park brakes. The use of a special N-513 compound cup in each
master cylinder permits the use of MIL-H-5606, a heavy-duty aviation hydraulic fluid. The brakes
are dual caliper disc types. The tail gear is a spring steel type and uses a 600 x 6 tailwheel.
FLIGHT CONTROLS
The flight controls are of conventional design employing extensive use of ball bearings for low
friction and smoothness of operation. The aileron and elevator controls are push rod systems and
the rudder control is through cables. The elevator trim control is actuated by a lever that moves the
tab to the desired position through push rods. The wing flaps are operated electrically and
controlled by a switch located on the left side of the cockpit. The rudder controls are interconnected
by springs to the aileron system so that a wing may be lifted with the rudder alone.
INSTRUMENTS
The standard instruments are located on three separate panels: An upper panel, a left panel, and a
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
right panel. The left panel contains a clock, oil temperature, hour meter, fuel pressure, oil pressure,
air filter Delta “P”, and fuel quantity gauges. The right panel contains a voltmeter, ammeter, and
circuit breakers. The upper panel contains all engine-warning lights, torque pressure, ITT indicator,
and Gas Generator percent RPM, Propeller RPM and standard flight instrument package.
ELECTRICAL SYSTEM
The standard 24 volts and 105 amps electrical system consists of the starting system, the
navigation lights, the wiper/washer system, and the strobe lights. The landing lights, the working
lights, and the air conditioner system are optional. The landing and working lights may be installed
in the field, since the wiring for them is included in the standard wire bundle. The electrical system
obtains power from two 24-volt batteries and one starter/generator. An external power receptacle is
standard equipment and may be used for connecting a 24-volt ground power unit to the aircraft for
engine starting or maintenance. The ground start system utilizes the master relay so that starting is
accomplished by engaging the starter switch.
AIRCRAFT WEIGHT & BALANCE
Refer to S2R-T660 Flight Manual for aircraft weight and balance information.
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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Section 2
SERVICING & INSPECTION
TABLE OF CONTENTS
SECTION TWO ................................................................................................................................................ 1
SERVICING .................................................................................................................................................. 3
GROUND HANDLING .................................................................................................................................. 3
TOWING ................................................................................................................................................... 3
TAXIING ................................................................................................................................................... 3
PARKING ................................................................................................................................................. 3
MOORING ................................................................................................................................................ 3
JACKING .................................................................................................................................................. 4
LEVELING ................................................................................................................................................ 4
COLD WEATHER OPERATION .................................................................................................................. 4
COLD WEATHER MAINTENANCE HINTS ............................................................................................. 4
GROUND EMERGENCY PROCEDURES ................................................................................................... 5
ENGINE FIRES ........................................................................................................................................ 5
ELECTRICAL FIRES ................................................................................................................................ 6
GROUND OPERATION OF ENGINE .......................................................................................................... 6
BEFORE STARTING ENGINE ................................................................................................................. 6
STARTING ENGINE ................................................................................................................................. 7
ENGINE OPERATIONAL CHECK ........................................................................................................... 8
SYSTEM AND COMPONENT SERVICING .................................................................................................8
HYDRAULIC SYSTEM ............................................................................................................................. 9
ENGINE OIL SYSTEM ............................................................................................................................. 9
FUEL SYSTEM ....................................................................................................................................... 13
DEFU ELI NG ......................................................................................................................................... 15
INDUCTION SYSTEM ............................................................................................................................ 16
POWER PLANT INTERNAL CLEANING ............................................................................................... 16
LANDING GEAR, WHEELS & BRAKES .................................................................................................... 17
TI RES .................................................................................................................................................... 17
BRAKE BLEEDING ................................................................................................................................ 17
I NSPECTION ......................................................................................................................................... 17
INSPECTION CHECK LIST ................................................................................................................... 17
INSPECTION CHART ............................................................................................................................. 19
ENGINE EXTERNALS ............................................................................................................................... 21
ENGINE OIL SYSTEM ............................................................................................................................... 22
ENGINE FUEL SYSTEM ............................................................................................................................ 24
IGNITION SYSTEM .................................................................................................................................... 25
PNEUMATIC SYSTEM .............................................................................................................................. 25
AIRFRAME FUEL SYSTEM ....................................................................................................................... 25
MAIN LANDING GEAR .............................................................................................................................. 26
TAIL GEAR ................................................................................................................................................. 27
FUSELAGE SKINS .................................................................................................................................... 28
HOPPER .................................................................................................................................................... 28
WI NGS ...................................................................................................................................................... 29
FUSELAGE FRAME ................................................................................................................................... 30
CONTROL SYSTEMS ................................................................................................................................ 30
METAL EMPENNAGE ............................................................................................................................... 32
AILERONS AND FLAPS ............................................................................................................................ 33
COCKPIT .................................................................................................................................................... 34
ELECTRICAL SYSTEM ............................................................................................................................. 34
AIRFRAME MAINTENANCE
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THRUSH AICRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
CORROSION CONTROL ........................................................................................................................36
WINDSHIELD ..........................................................................................................................................37
HOPPER REPAIR ...................................................................................................................................37
FUEL TANK REPAIR ..............................................................................................................................37
BATTERY MAINTENANCE ....................................................................................................................37
LUBRICATION ........................................................................................................................................38
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