AIR CONDITIONING MODULE - REMOVAL/INSTALLATION
1. General
A. This procedure provides instructions to remove, install, and test the P5-10 air conditioning module, located on the P5 forward overhead panel. The test of the air conditioning module checks the integrity of the circuits into and out of the module.
2. Air Conditioning Module Removal (Fig. 401)
A. Open all circuit breakers on the P6-4 circuit breaker panel that are associated with the air conditioning system.
B. Lower the P5 forward overhead panel to get access to the back of the P5-10 air conditioning module.
C. Disconnect electrical connectors D646 and D680 from the back of the air conditioning module.
D. Loosen the fasteners on the sides of the air conditioning module that attach the module to the P5 forward overhead panel.
E. Remove the air conditioning module.
3. Air Conditioning Module Installation (Fig. 401)
A. Put the air conditioning module in its place in the P5 forward overhead panel.
B. Tighten the fasteners on the sides of the air conditioning module that attach the module to the P5 forward overhead panel.
C. Connect electrical connectors D646 and D680 to the air conditioning module.
D. Raise the P5 forward overhead panel into position and tighten the retaining fasteners.
4. Air Conditioning Module Test
A. Supply electrical power to the airplane.
B. Close all air conditioning circuit breakers on the P6-4 circuit breaker panel.
C. Check that all the following circuit breakers on circuit breaker panel P6-3 are closed:
(1)
MASTER CAUTION (all except FUEL, if installed)
(2)
INDICATOR LIGHTS, MASTER DIM BUS (9 places)
(3)
DIM & TEST
D. Make sure the RAM DOOR FULL OPEN lights on the P5-10 air conditioning module are on.
E. Make sure the L and R PACK switches on the air conditioning module are set to OFF.
F. Set the LIGHTS switch on the P2 center instrument panel momentarily to TEST and make sure these lights come on and then go off.
(1)
AUTO FAIL
(2)
OFF SCHED DESCENT
(3)
STANDBY
(4)
MANUAL
(5)
L and R PACK TRIP OFF
(6)
L and R BLEED TRIP OFF
(7)
DUAL BLEED
(8)
F OUTFLOW CLOSED
G. Push the OVHT TEST switch and make sure the WING-BODY OVERHEAT lights come on.
H. Open right cowl on both engines.
I. Position engine 1 BLEED switch to ON.
J. Check that bleed air valve for engine 1 opens as shown by valve position indicator.
K. Position engine 1 BLEED switch to OFF and check that valve closes.
L. Repeat steps H thru K for engine 2 BLEED switch.
M. Position GASPER AIR switch to ON.
N. Check that gasper fan operates and air is discharged from PSU gasper outlets in control and passenger cabins.
O. Position GASPER AIR switch to OFF.
P. Open an airplane door.
May 01/00 21-51-01 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Air Conditioning Module Installation 501
21-51-01 Figure 401 May 01/00
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Q. Test the air conditioning module APU, PACK, ISOLATION VALVE and BLEED switches as follows:
(1)
Supply pneumatic air from the APU.
(2)
Put the ISOLATION VALVE switch to close.
(3)
Put the APU BLEED switch to ON.
(4)
Make sure pressure is indicated on the left pressure gage.
(5)
Put the L PACK switch to the AUTO position.
(6)
Make sure the indication on the left pressure gage decreases.
(7)
Put the L PACK switch to the OFF position.
(8)
Put the ISOLATION VALVE switch to the OPEN position.
(9)
Make sure pressure is indicated on the right pressure gage.
(10)
Put the R PACK switch to AUTO.
(11)
Make sure the indication on the right pressure gage decreases.
(12)
Put the R PACK switch to OFF.
R. Return the Airplane Back To Its Usual Condition:
(1)
Remove pneumatic power.
(2)
Put the APU BLEED switch to OFF.
(3)
Remove electrical power if it is not necessary.
(4)
Close airplane door opened for this test.
(5)
Close engine cowls.
501
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-51-01 Page 403
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