SEP 2012 R66 Maintenance Manual Chapter 21 Environment Control Page 21.13
21-33 Diffuser and Tee Assemblies (continued)
B. Forward Diffuser and Tee Assembly Installation
1. Refer to Figure 21-3. As required, install MS21919WCH16 and (two) B277-24
clamps on G400-1 tee assembly. Install tee with clamps, and install hardware
securing MS21919WCH16 clamp and tee to angle.
2. Insert G400-7 and G400-8 diffuser assemblies through lower console and into tee
assembly. Orient diffuser holes vertically within 5°, and tighten clamps (against
spacers) securing tee assembly collars to diffusers. Verify security.
3. Slide A785-39 hose and B277-12 clamp onto tee assembly can weldment and tighten
clamp. Verify security.
4. Close and secure upper console.
C. Aft Diffuser Assemblies and Tee Removal
1. Refer to Section 6-70. Remove hardware securing F794-1 (belly cover) forward
panel and remove panel.
2. Refer to Figure 21-3. Hinge aft right and left seats forward. Remove hardware
securing G394-1 guards and G392-3 diffuser assemblies to aft seat assemblies and
remove guards. Hinge seats back.
3. Disconnect diffuser assembly B-nuts from AN824-8D tee and remove diffusers. As
required, disconnect G391-4 line assembly B-nut from tee and remove tee. Cap
fittings.
D. Aft Diffuser Assemblies and Tee Installation
1. Refer to Figure 21-3. As required, remove caps, install AN824-8D tee, and connect
G391-4 line assembly B-nut, but do not torque.
2. Remove caps and install G392-3 diffuser assemblies; connect diffuser assembly
B-nuts to tee, but do not torque. Hinge aft right and left seats forward and install
hardware securing diffusers to aft seat assemblies. Special torque line assembly and
diffuser B-nuts per Section 20-33, and torque stripe per Figure 5-1.
3. Install G394-1 guards and hardware securing guards to aft seat assemblies. Verify
security. Hinge seats back.
4. Install (belly cover) panel, and install hardware. Verify security.
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