CHAPTER 4 AVIATION UNIT MAINTENANCE INSTRUCTIONS

9-1270-219-13&P

CHAPTER

AVIATION

UNIT

MAINTENANCE

INSTRUCTIONS

Section

SERVICE

UPON

RECEIPT

MATERIEL

4-1. Inspecting Instructions.

c. Visually Inspecting the EPU.

a. Visually Inspecting the AADS.

(1) Inspect the EPU for dust, dirt, lint, grease, oil

or other foreign matter, scratched or damaged surfaces,

(1) Inspect the AADS for dust, dirt, lint, grease,

loose or missing screws and illegible or obliterated markings.

oil or other foreign matter, scratched or damaged surfaces

w h i c h would impair the operation of the AADS. Inspect for

l o o s e or missing screws, illegible or obliterated markings,

(2)

Inspect

the

electrical

connector

for

and broken or missing safety wire.

broken, loose, bent, corroded or missing pins.

(2)

Inspect

the

electrical

connector

for

(3) Check that the pitot and static connectors PS

broken, loose, bent, corroded or missing pins.

and

PT o n

the

front

panel

are

unobstructed

and

have

undamaged threads.

(3) Check that the pitot hole, the two static

holes and the two drain holes in the head are unobstructed.

d. Visually Inspecting the LAI.

that

the

pitot

and

static

union

(4)

Check

body

are

unobstructed

and

have

connectors

the

(1) Inspect the LAI for dust, dirt, lint, grease, oil

undamaged threads.

or other foreign matter, scratched or damaged surfaces, and

loose or damaged screws.

(5) Check that the swivelling probe rotates freely

through 360 in pitch and approximately 120 in yaw

(2) Inspect the electrical connector for broken,

(fig. 1-9).

loose, bent, corroded or missing pins.

b. Visually Inspecting the Sensor Installation

(3) Inspect the front of the LAI for damaged glass

and illegible or obliterated dial markings.

(1)

Inspect

the

sensor

installation

support

assemblies (9, fig. 4-1) for loose or missing bolts, screws and

threaded inserts. Inspect for loose rivets securing support

4-2. Installing the AADS.

assembly to tube assembly (8).

a. Secure the helicopter pitot and static union

(2) Inspect the tube assembly (8) and mounting

connectors (12 and 13, fig. 4-1) to the AADS. If necessary

bracket (7) for cracks. Inspect mounting bracket for loose

loosen

helicopter

plumbing

securing

clips

allow

rivets.

movement of the pitot and static plumbing. Tighten

securing

clips

after

the

helicopter

pitot

and

static

(3)

Inspect

canopy

channel

support

(5)

for

connectors have been secured to the AADS.

cracks and loose or missing screws.

Connect

the

helicopter

electrical

connector

(4) From inside the pilots compartment, inspect

18A2J1 (14) to the AADS.

pitot

and

static

lines

for

chafing,

breaks

and

loose

connectors.

c . Apply a thin film of sealant (item 1, Appendix

F) to the sensor installation support assembly (9) mat

(5)

Inspect

clamps

for

proper

installation

ensure pitot and static lines are not crimped.

surface.

4-1