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Cirrus SR20 Maintenance Manual

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CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
08-10
Page 1
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EFFECTIVITY:
LEVELING
1. DESCRIPTION
This chapter provides information necessary to properly level the airplane for any of the various mainte-
nance, overhaul, or major repairs which might become necessary.
For general longitudinal leveling, the cabin door sill edge is parallel within 0.10° relative waterline 100. The
door sill is used in conjunction with a spirit level to determine airplane ground attitude.
Serials 1005 thru 1422: For specific longitudinal leveling, two forward leveling points are located on either
side of the cowl at fuselage station 99.00. One aft point is located on the tailcone access flange under the
horizontal stabilizer on the right side, at fuselage station 299.00. The leveling points are used in conjunc-
tion with a transit to determine ground attitude.
Serials 1423 & subs: For specific longitudinal leveling, two forward leveling points are located on either side
of the cowl at fuselage station 98.4. One aft point is located below the RE1 empennage access panel aft of
the horizontal stabilizer, at fuselage station 316.8. Pegged ruler gauges suspended from the leveling points
are used in conjunction with a transit to determine ground attitude.
For general lateral leveling, a straight edge may be placed across both cabin door sills. The door sill is
used in conjunction with a spirit level to determine airplane ground pitch.
For specific lateral leveling, an alignment brace bar may be placed across the upper engine mount weld-
ment attach points. The attach points are used in conjunction with a digital level to determine airplane
ground pitch.
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EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
15 Jun 2010
2. MAINTENANCE PRACTICES
A. Longitudinal Leveling
(1) Spirit Level Using Door Sill (See Figure 08-101)
(a) Acquire necessary tools, equipment, and supplies.
(b) Open LH or RH cabin door.
(c) Position and hold spirit level to composite ledge below door sill.
(d) To level airplane longitudinally, deflate nose gear tire to center bubble in level.
(2) Transit Level Using Fuselage Leveling Points (See Figure 08-101)
(a) Acquire necessary tools, equipment, and supplies.
(b) Serials 1005 thru 1422: At WL 95.9 on side of fuselage, remove screws at forward longitu-
dinal leveling point located at FS 99.0, and aft longitudinal leveling point located at FS
299.0.
(c) Serials 1423 & subs: At WL 103.5 on side of fuselage, remove screws at forward longitudi-
nal leveling point located at FS 98.4, and aft longitudinal leveling point located at FS 316.8.
(d) Position pegged ruler gauges at forward and aft longitudinal leveling points.
(e) Position aircraft jack at aft tail tie-down.
(f) Position and sight transit level on ruler gauges and observe transit level crosshair locations
on rulers.
(g) To level airplane longitudinally, raise or lower jack as required until transit level is aligned
with the same measurement on both ruler gauges. (Refer to 07-10)
Description P/N or Spec. Supplier Purpose
Spirit Level - Any Source Level the airplane.
Description P/N or Spec. Supplier Purpose
Transit Level - Any Source Leveling
Ruler Gauge (Pegged),
Forward and Aft
T6320 Cirrus Design
Duluth, MN 55811
218-727-2737
Leveling
Aircraft Hydraulic Jack - Any Source Leveling
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
08-10
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EFFECTIVITY:
Figure 08-101
Airplane Leveling - Longitudinal
SR20_MM08_1773B
Serials 1423 & subs.
WL 103.5
At door opening, position spirit level along lower
composite ledge located below door seal, to represent
pitch axis for pitch attitude.
NOTE
WL 95.9
3
3
1
3
3
2
LEGEND
1. Transit Level
2. Aircraft Hydraulic Jack
3. Ruler Gauge (Pegged)
WL 103.5
WL 100
DOOR SILL
SPIRIT LEVEL
FS 306
FS
99.0
FORWARD
LEVELING HOLE
Ø 0.129
FS
98.4
Ø 0.25
FORWARD
LEVELING HOLE
FS
316.8
Ø 0.25
AFT
LEVELING HOLE
AFT
LEVELING HOLE
Ø 0.129
FS
299.0
WL 95.9
Serials 1005 thru 1422.
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EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
15 Jun 2010
B. Lateral Leveling
(1) Spirit Level Using Door Sills (See Figure 08-102)
(a) Acquire necessary tools, equipment, and supplies.
(b) Remove main landing gear fairings. (Refer to 32-10)
(c) Open both doors on airplane.
(d) Place spacer blocks on LH and RH door sills so that height of blocks is higher than door
seals.
(e) Place a straight edge on top and perpendicular to spacer blocks positioned on door sills,
centered.
(f) Place spirit level on top and parallel to straight edge, centered.
(g) To level airplane laterally, deflate main gear tire to center bubble in level.
(h) Install main landing gear fairings. (Refer to 32-10)
(2) Digital Level Using Engine Mount Weldment (See Figure 08-102)
(a) Acquire necessary tools, equipment, and supplies.
(b) Remove main landing gear fairings. (Refer to 32-10)
(c) Remove upper engine cowling. (Refer to 71-10)
(d) Position leveling bar on upper engine mount weldment. At flat, upper surface of leveling
bar, position digital level lengthwise.
(e) To level airplane laterally, deflate LH or RH main landing gear tire as required until digital
level reads 0°.
Note: Perform tasks that required leveling prior to leveling equipment removal and
cowl reinstallation.
(f) Remove digital level and engine mount leveling bar from airplane.
(g) Install upper engine cowling. (Refer to 71-10)
(h) Install main landing gear fairings. (Refer to 32-10)
Description P/N or Spec. Supplier Purpose
Spirit Level - Any Source Level the airplane.
Straight Edge
minimum 5.0 ft (1.5 m)
- Any Source Level platform.
Spacer Blocks
1.0 × 2.0 inches (2.54 × 5.08 cm)
- Any Source Level platform.
Description P/N or Spec. Supplier Purpose
Engine Mount Leveling Bar T2474 Cirrus Design
Duluth, MN 55811
218-727-2737
Leveling
Digital Level - Any Source Leveling
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
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EFFECTIVITY:
Figure 08-102
Airplane Leveling - Lateral
SR20_MM08_1037D
DOOR SEAL
(REF)
DOOR SEAL
(REF)
STRAIGHT EDGE
STRAIGHT EDGESTRAIGHT EDGE
SPACER BLOCK
DOOR SILL
DOOR SILL
SPACER BLOCK
NOTE
Position alignment brace bar at upper engine mount
weldment attach points.
SPIRIT LEVEL
2
1
LEGEND
1. Digital Level
2. Engine Mount Leveling Bar
To level airplane laterally, deflate LH or RH main landing
gear tire as required until digital level reads 0°.
Position spirit level on straight edge so it points
outboard, to represent roll axis for roll attitude.
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EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR20
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