-
Leakage Test of the Engine Bleed Air Ducts Upstream of the PRSOV
B.
The pneumatic duct leakage can be measured by one of two procedures:
-
Measure the air flow necessary to keep the duct pressure at 44-46 psig
-
Measure the rate of pressure decrease (decay).
C.
Refer to AMM 36-11-00/601 to perform the bleed down leakage check procedure to monitor the level of leakage in the engine bleed air supply system.
D.
Refer to AMM 36-11-00/601 to do the Engine Bleed, Wing Leading Edge and Body Crossover Duct Audible Leakage Check procedure.
TASK 36-11-00-715-148
2. Engine Bleed Air Supply System Operational Test_______________________________________________
A. General
(1)
This procedure performs an operational test of the engine bleed air supply system with the engines in operation. The test requires that the engines be operated at speeds higher than ground idle (just fast enough to achieve HP/IP switchover) for a short time to simulate as closely as possible to conditions that are experienced in-service.
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 45-10-00/201, Central Maintenance Computer System
(3)
AMM 71-00-00/201, Power Plant
C.
Procedure
(1)
Supply the electrical power (AMM 24-22-00/201).
S 865-124
(2)
Make sure that these circuit breakers are closed:
(a)
On the main power distribution panel, P6: 1) 6F19, PILOTS MISC IND 1
S 865-123
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
2) 6F20, PILOTS MISC IND 2
3) 6F28, ZONE TEMP CONT AC
4) 6F29, ZONE TEMP CONT DC
5) 6F33, PACK TEMP CONT AC-A
6) 6F34, PACK TEMP CONT AC-B
7) 6F35, PACK TEMP CONT DC-A
8) 6F36, PACK TEMP CONT DC-B
9) 6H20, L ISO VLV AIR SUPPLY PWR
10) 6H22, APU ISO VLV AIR SUPPLY PWR
11) 6H24, R ISO VLV AIR SUPPLY PWR
12) 6H36, APU VLV AIR SUPPLY CONT
13) 6J10, NACELLE ANTI-ICE 1
14) 6J11, NACELLE ANTI-ICE 2
15) 6J12, NACELLE ANTI-ICE 3
16) 6J13, NACELLE ANTI-ICE 4
(b)
Oh the overhead circuit breaker panel, P7:
1) 7F01, HYD DEMAND 4
2) 7F09, EIU L
3) 7F10, EIU C
4) 7F15, EIU R
5) 7G01, HYD DEMAND 2
6) 7H01, HYD DEMAND 3
7) 7H09, CARGO HEAT AFT
8) 7J01, HYD DEMAND 1
(c)
On the DC power distribution panel, P180:
1) 180F01, FLOW CONT VLV PACK 2
2) 180J01, FLOW CONT VLV PACK 1
3) 180J16, FLOW CONT VLV PACK 3
S 865-125
(3)
Open and then close these circuit breakers on the P6 panel:
(a)
6H32, ENG 1 AIR SUPPLY CONT
(b)
6H33, ENG 2 AIR SUPPLY CONT
(c)
6H34, ENG 3 AIR SUPPLY CONT
(d)
6H35, ENG 4 AIR SUPPLY CONT
S 865-126
CAUTION: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
(4)
Make sure that all four hydraulic demand pump switches on the M7316 hydraulic module are in the OFF position.
S 865-127
(5)
Make sure that the wing anti-ice switch on the M7321 module is in the OFF position.
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