Chapter 3. AVIATION UNIT MAINTENANCE INSTRUCTIONS

TM 55-4920-405-13&P

CHAPTER 3

AVIATION UNIT MAINTENANCE INSTRUCTIONS

Section I. PREPARATION FOR INSTALLATION, STORAGE, AND SHIPMENT

NOTE

3-1. PREPARATION FOR INSTALLATION.

If the engine crankcase has been filled with

a. Uncrating. Remove the test stand from its

corrosion preventive compound for storage

shipping container (figure 3-1) as follows:

or shipment, drain all corrosion preventive

(1) Disconnect the tie down straps.

compound before lubrication.

(2) Connect cable slings to the lifting eyebolts

of the test stand. Using a lifting device

f. Battery Activation. The battery is supplied

that can lift over 2000 pounds, lift the test

with the test stand, but is not activated. The battery

stand out of its shipping container.

must be activated as follows:

b. Unpacking. After uncrating the test stand, do

WARNING

the following:

(1) Remove all pressure sensitive tape from

The battery generates explosive gas; keep

seams, doors, panel screens, and ventila-

flames, sparks, and hot glowing objects

tion ducts.

away. Ventilate the area while charging

(2) Remove all barrier material from ventila-

a battery. The battery heats up during

tion ducts and screens.

activation. Wear protective gloves if you

(3) Remove all dessicant bags from inside the

have to handle the battery before it can

test stand cabinet.

cool down.

(4) Remove pressure sensitive tape from all

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sealed openings.

CAUTION

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c. Cleaning. After unpacking the test stand,

Never add acid to the battery. Do not

clean it as follows:

break seals until the battery is to be

(1) Remove preservative from the outside sur-

activated. Do not use mineral water to

faces of the test stand with solvent (item

activate the battery; use fresh, clean

1, table 1-7).

water from the cold water tap.

(2) Blow away dust and loose packing material

from the test stand, using a low pressure

(1) Open the flip cap vents along the center

air source.

line of the battery top. Using the knockout

tool supplied with the battery, break the

d. Preinstallation Inspection. Carefully inspect

seal in each of the six vent tubes. Do not

the test stand for any signs of damage that might

try to retrieve the sealing discs.

have occurred during shipment. Correct all

(2) Close the flip cap vents.

deficiencies. Make certain that:

(3) Remove the initial fill caps along the edge

(1) All gages and controls on the control

of the battery top. Using the knockout

panels are not damaged, missing, or

tool, break the seal at the bottom of each

loose.

of the six filler tubes. Do not try to re-

(2) All major components (figures 1-2 and

trieve the sealing discs.

1-3) are not damaged, missing, or loosely

mounted.

-- UT.IO--

CA .

(3) Hydraulic tubing is not damaged, and all

Keep your fingers out of the filler tubes.

fittings in the hydraulic and fuel line sys-

Newly exposed surfaces may have a film

tems are tightly connected.

of concentrated acid.

(4) All hand operated controls and switches

operate freely.

(4)

Pour clean, cold tap water slowly through

(5) All electrical connections are tight.

the filler tubes until the water level in

(6) All four tires show no signs of deep cuts,

each cell is up to the bottom of the filler

fabric breaks. or excessive wear.

tube.

(7) All tires are inflated to about 60 PSI.

(5) Install the initial fill cap filler plugs.

Press them down firmly, and make sure

e. Preliminary Lubrication. Check the oil level

that they rest on the cover. These plugs

in the engine crankcase. Make sure that all points

need never be removed again.

listed in table 3-5 are properly lubricated.

3-1