Connecting the APU.

TM 55-4920-424-13&P

c. Connecting the APU.

(1) Remove protective cap from fuel inlet filter fitting on APU, and connect flexible fuel supply line refer to

(Fig. E-4) from check stand. Refer to Fig E-4.

NOTE

Reconnect PCD air supply line and fuel supply line (Refer to Fig E-8) to Purge

Valve Assembly.

(2) Connect check stand control harness (P301)(Fig E-8) to harness receptacle on APU. Tighten harness

connector securely.

(3) Cap the large customer air tube with a unit made cap and coupling clamp P/N 12J16-150 (UH-60)

(4) (For U/EH-60 APU) Remove and plug the oil fitting attached to the accessory drive assembly next to the

fuel control system.

(5) Remove fuel control covering (Fig. E-9) to allow mounting of the starter generator.

1. Starter/Generator (P\W 23032-020) is used on the U\EH-60 APU.

2. Starter/Generator (P\N 20064-001) is used on the CH-47D APU.

3. The aircraft installed generator may remain attached to the APU.

(6) Install the appropriate auxiliary starter/generator (Fig. E-10) for your APU. (For U/EH-60 APU) First install

the starter/generator mounting bracket (Fig. E-9) to the accessory drive assembly with four nuts and washers, used to

hold the hydraulic starter on. With clamp, install starter/generator (P/N 23032-020) and tighten clamp nut. (For CH-47D)

First remove hydraulic starter and install electric starter/generator.

(7) Reinstall fuel control covering.

(8) Connect the four electrical leads from the control console to the starter/generator, observing proper

markings match.

(9) Install drain lines to the fuel drain and compressor drain. Route lines into a suitable waste fuel container.

CAUTION

Do not transport mobile check stand over rough terrain with APU installed.

Vibrations and Shock may damage vital APU parts.

3-5.

PRELIMINARY CHECKS.

Change 2 E-17