D. Access
(1) Location Zone 117 Electrical and Electronics Compartment, LH 121 Forward Cargo Compartment Forward Half, LH 122 Forward Cargo Compartment Forward Half, RH 211 Passenger Cabin Nose to First Door, LH
E. Prepare for the Test
S 865-014
(1)
Supply electrical power (Ref 24-22-00/201).
S 415-016
(2)
Remove the sidewall lining from the left side of the forward cargo compartment between Stations 500 and 600 to get access to the supply system (AMM 25-52-01/401).
S 015-021
(3)
Remove the sidewall lining from the right side of the forward cargo compartment at Station 520 to get access to the exhaust fan (AMM 25-52-01/401).
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S 415-017
(4)
Lower the applicable ceiling panel to get access to the flight deck low flow (cooling effect) detector (Ref 25-22-01/401). The detector is installed above the main deck ceiling on the left side of the airplane, approximately 10 feet (305 cm) aft of the forward bulkhead.
S 415-018
(5)
If neccessary for access to the flight deck low flow (cooling effect) detector; remove the left hand drip shield which is installed just forward of flight deck forward bulkhead (Ref 25-14-01/401).
S 865-033
WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE SPECIFIED TASK TO
_______ PUT THE AIR/GROUND RELAY SYSTEM IN THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(6) Do the "Put the Air/Ground Relay System in the Air Mode" task (Ref 32-09-02/201).
F. Do the Test
S 735-020
(1)
Do a test of the equipment cooling system in the closed loop mode (one fan failure) with the airplane in the air mode.
S 865-142
(2)
Set the EQUIP COOLING switch on the P5 overhead panel to NORM.
S 865-143
(3)
Make sure that the exhaust fan and the supply fan are operating (listen for the sound of the fan).
S 865-144
(4)
Make sure the inboard supply valve, inboard exhaust valve, and E6/E9 valve are open.
S 865-145
(5)
Make sure that the bypass valve, ground exhaust valve and
smoke/override valve are closed.
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S 865-140
(6) Make sure these circuit breakers are open:
(a) On the DC power distribution panel, P180:
1) 180J4, EQUIP COOL CONT SUPPLY FAN
S 865-146
(7)
Make sure the exhaust fan is on and the supply fan is off.
S 865-141
(8)
Make sure these circuit breakers are closed:
(a) On the DC power distribution panel, P180:
1) 180J4, EQUIP COOL CONT SUPPLY FAN
S 865-147
(9)
Make sure the supply fan and the exhaust fan are on.
S 865-148
(10)
Make sure these circuit breakers are open:
(a) Circuit breaker on the power distribution center-left, P414: 1) 414R30, EQPT COOLING SUPPLY FAN
S 715-150
(11)
Make sure the exhaust fan is on and supply fan is off.
S 715-151
(12)
Make sure the bypass valve and the E6/E9 valve are open.
S 715-152
(13)
Make sure the inboard supply valve, inboard exhaust valve, ground exhaust valve and smoke/override valve are closed.
S 745-153
(14)
Make sure the status message EE CLNG SUP FAN is the only equipment cooling message shown on EICAS.
S 865-154
(15) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 2(73)
