Cessna SK180-26A Quick start guide

Brand: Cessna

Model: SK180-26A

Type: Quick start guide

SK180-26A

FEBRUARY

3,

1969

Title

MARKER

BEACON

ANTENNA

MODIFICATION

C

ssna.

MODELS

AFFECTED

SERIALS

AFFECTED

150

All

serials

prior

to

serial

15059834

172

All

serials

prior

to

serial

17250075

P172

All

serials

prior

to

serial

P17257171

180

All

serials

prior

to

serial

18051226

182

All

serials

prior

to

serial

18254619

185

All

serials

prior

to

serial

185-0549

205

All

serials

prior

to

serial

205-0254

210

All

serials

prior

to

serial

21058143

PURPOSE:

To

install

a

rod

antenna

to

replace

the

marker

beacon

wire antenna.

NOTE

Aircraft

with

wire

antenna

installations

have

developed

cracks

in

the

antenna

masts.

All

such

installations

may

be

retrofitted

with

this

installation

of

a

rod antenna.

PARTS LIST:

QUANTITY

PART

NUMBER

NOMENCLATURE

1

0770681-1

Antenna

Rod

Assembly

-

Marker

Beacon

2

AN970-3

Washer

1

MS20365-1032C

Nut

1

AN520-10R12

Screw

1

AN936A10

Washer

1

AN742D3

Clamp

1

AN515-8R6

Screw

1

MS20364-832C

Nut

1

Installation

Instructions

INSTALLATION

INSTRUCTIONS:

a.

Drill

a

#

10

(0.

1935

inch) hole

approximately

two

inches

forward

of

the

ceramic

feed-thru

insulator

connected

to

the

existing

wire

marker-beacon

antenna.

b.

Refer

to

figure

1;

drill

a

#

10

(0.

1935

inch)

hole aft

of

the

insulator.

Refer

to

dimensions

given

to

locate

this

hole.

c.

Remove

screws

securing

both

antenna

masts

and

remove

masts.

Plug

screw

holes

in

skin

by

re-

installing

sheet

metal

screws.

d.

Install

rod

antenna

as

shown

in

figure

1.

e.

Using

the

wire

formerly

connected

to

the

wire

antenna,

a

clamp,

screw,

and

nut.

connect

the

rod

antenna

to

the

feed-thru

insulator.

(SK180-26)

f.

Using

a

75

mc

signal

generator

on

the

ground

or

tests

of

the

marker

beacon

in

flight,

adjust

position

of

the

clamp

on

the

rod

antenna

to

attain

a

maximum

signal.

AN520-10R12

SCREW

AN970-3

WASHER

AN936A10

WASHER

MS20365-1032C

NUT

AN970-3

WASHER

1

EA

REQD

1

EA

REQD

*27.

5"

(MODEL

205-210)

*25

(MODEL

150,

172,

P172,

180,

182,

185)

(ADJUST

CLAMP

POSITION

FORE-AND-AFT

FOR

MAXIMUM

SIGNAL)

*DIMENSIONS

ARE

APPROXIMATE

AND

MAY

BE

VARIED

TO

ALLOW

INSTALLATION

TO

CLEAR

FUSELAGE

STRUCTURE.

**PART

OF

ANTENNA

ASSY

NO.

0770681-1

Figure

1.

Marker

Beacon

Rod

Antenna

Installation

2

of

2

1
2

Cessna SK180-26A Quick start guide

Brand: Cessna

Model: SK180-26A

Type: Quick start guide

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