ADJUSTMENT. - TM-55-4920-424-13-P0138

TM 55-4920-424-13&P

b. Disconnect APU fuel lines from fuel manifold and from start fuel nozzle.

c. Connect suitable drain lines to disconnected lines, and place open ends of drain lines into a waste fuel container

(one-quart minimum capacity).

d. Connect Battery.

e. Push in MAIN POWER circuit breaker. (See figure E-3).

f. Move START RUN-OFF switch to RUN.

g. Move LITES TEST/ESU RESET switch to ESU RESET three times. Move FUEL BOOST PUMP switch to ON,

Let run approximately 30 seconds, and turn OFF.

h. Move START-RUN-OFF switch from RUN to START, and motor APU until air-free fu el flows from the drain lines;

then, move START-RUN-OFF switch to OFF.

i. Pull MAIN POWER circuit breaker.

j. Disconnect Battery.

k. Disconnect drain lines, and connect APU fuel lines to fuel solenoid valve; or to fuel manifold and start fuel nozzle.

I. Reconnect harness connector to APU ignition exciter.

3-9.

ADJUSTMENT.

3-10. Adjustment procedures are contained in the engine manual for your type APU, refer to the appropriate Technical

Manual.

3-11. OPERATION OF THE APU.

WARNING

Operation of this equipment presents a noise hazard to personnel in the area. The

noise level exceeds the allowable limits for unprotected personnel; wear ear muffs

or earplugs which were fitted by a trained professional.

3-12. Starting APU without APU Tester Box (P/N 161226-200) installed.

a. Place Instrument panel switches in the following positions:

(1) START-RUN-OFF switch to OFF.

(2) FUEL BOOST PUMP switch to OFF.

Change 2 E-19