A45206
4500F Thermostat Installation 500
36-12-41Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/92
B. Remove the cap from the sense line.
C. Remove the cover from the opening on the duct.
D. Make sure there is packing on the thermostat.
E. Use the screws (2 locations) to attach the thermostat to the pneumatic duct.
NOTE: Do not tighten the screws at this time.
F. Apply a thin layer of antiseize compound to the external threads of the sense line/450oF thermostat coupling.
G. Connect the sense line to the thermostat.
NOTE: Do not tighten the sense line at this time.
H. Tighten the screws (2 locations) which connect the thermostat to the pneumatic duct.
I. Tighten the sense line.
5. Restore Airplane to Normal Configuration
A. Install the fixed fairing (AMM 71-11-21/.401).
B. Install the engine-to-wing forward fairing (AMM 54-51-11/401).
C. Install the side removable cowl panels (AMM 71-11-11/401).
D. Remove the DO-NOT-OPERATE tag from the following switches on the P5 panel:
(1)
BLEED 1
(2)
BLEED 2
(3)
APU BLEED
E. Remove the DO-NOT-CLOSE tag and close the BLEED AIR VALVES circuit breaker on the P6 panel.
Aug 01/96 36-12-41 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
DUCTS - MAINTENANCE PRACTICES
1. General
A. On newer airplanes, gold paint or tape insulation has been added on air conditioning ducts in the underwing left and right-hand pack bays. With air conditioning pacts using APU bleed air during ground operation in hot weather, the gold paint or tape insulation reduces radiation and eliminates possible overheat nuisance warnings. Gold painted or taped ducts should be cleaned periodically to prevent duct surfaces from becoming coated with contaminants.
2. Cleaning Gold Painted Or Taped Ducts (Fig. 201)
A. Clean with BMS 3-2 Type 1 or 2 or naphtha.
B. Wipe with a damp cloth.
501
May 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-19-11 Page 201
F89309
Gold Painted or Taped Ducts Location 501
36-19-11 Figure 201 May 01/74
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
DUCTS AND CLAMPS - REMOVAL/INSTALLATION
1. General
A. The ducts for the air conditioning, thermal anti-icing and pneumatics systems are all held in place by support clamps and joined together by V-band clamps. Some of the duct sections are designed and manufactured slightly short in length, in order to compensate for thermal expansion when hot air flows through the ducts. When ducts are installed the systems are inoperative therefore the ducts are cold and must be slightly prestressed by the clamps at the duct joints. Some V-band clamps are installed in areas containing control cables and special attention must be taken to ensure against interference with control cables.
2. Remove Ducts and Clamps
A. Gain access to the duct by removing the appropriate access panels.
B. Loosen V-band clamps at either end of duct section. (See figure 401.)
C. Unfasten duct support clamps which secure duct section to support brackets.
D. Remove duct support clamps, V-band clamps, and duct section.
3. Install Ducts and Clamps (See figure 401.)
A. Check that duct section is clean and undamaged. If a new duct section is being installed, be certain the new section is the correct part for the section being replaced.
B. Place new duct section in position and support loosely in duct support clamps.
C. Install duct V-band clamps
(1) Arrange loose duct sections so as to evenly space gap between ducts. Normal gap in 0.03 inch or less. If gap is in excess of 0.03 inch, loosen adjoining duct sections as required. If 0.03-inch maximum gap for all joints in work is not obtainable, equalize the gaps and proceed.
500
Jul 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-19-11 Page 401
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