Figure 3-1. Mounting and Connecting the APU

TM 55-4920-424-13&P

Fuel Inlet Line

APU Support Housing

APU Co ntrol Harness

Air Inlet Silencer

Tachometer Generator

Thermocouple

Exhaust Duct Assembly

Figure 3-1. Mounting and Connecting the APU

(1) Using a suitable hoist assembly, or equivalent, position APU and engage spline drive adapter. Move APU

forward until it contacts face of speed increaser mounting pad.

(2) Secure APU to speed increases with nuts and washers removed in step a. (3), preceding.

(3) Secure APU to bracket assembly (122, figure 5-1) with wing bolt assembly (121).

(4) Install flexible duct section from air inlet silencer (4, figure 3-1) to air inlet shroud on APU. Secure flexible

duct with clamp provided.

c. Connecting the APU. (See figure 3-1.)

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

check stand. Install protective cap on check stand dummy fitting.

(2) Connect check stand control harness (3) to harness receptacle on APU.

Tighten harness connector

securely.

(3) Install tachometer generator (6)(furnished with stand) on aft pad of APU speed switch, using coupling, nuts,

and washers furnished with stand.

3-2