21-21 Compressor Assembly (continued)
B. Removal
1. Remove tailcone cowling per § 53-23.
2. Turn BATTERY switch OFF. Cut and discard ty-raps as required and disconnect
compressor assembly wiring from airframe harness at connectors.
3. Recover refrigerant per § 12-81. Remove hardware securing refrigerant hose
assemblies to G777-1 compressor assembly. Cap fittings.
4. Remove hardware securing compressor to G781-1 arm weldment and G782-1
mount weldment and remove compressor.
C. Installation
1. Remove G777-1 compressor assembly service port caps and completely drain oil.
Using a syringe, service compressor with 120±10 cc A257-20 pag oil into the
high pressure port. Install service port caps; verify security.
2. Refer to § 5-45. Inspect B173-5 v-belt condition and replace as required. Fit
belt around G779-1 pulley and compressor pulley, and install hardware securing
compressor to G782-1 mount weldment. Standard torque bolts per § 20-32.
3. Install hardware securing compressor to G781-1 arm weldment. Rotate compressor
up and outboard to tension belt, then tighten hardware securing compressor to
weldment. Adjust belt until 4.5-5.5 lb of force applied mid-span deflects belt
0.16-inch. Standard torque bolts per § 20-32, and torque stripe all compressor
mounting hardware per Figure 5-1.
4. Remove caps and install refrigerant hose assemblies and hardware securing hoses
to compressor. Special torque screws per § 20-33 and torque stripe per Figure
5-1.
5. Connect compressor assembly wiring to airframe harness at connectors and install
ty-raps as required. Cinch ty-raps until snug without over-tightening, and trim tips
flush with heads.
6. Perform leak detection per § 12-83.
7. Charge system with refrigerant per § 12-82.
8. Install tailcone cowling per § 53-23.
Page 21.6 Chapter 21 Environment Control MAY 2015
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