S 026-022
(8) Remove the APU Controller, M7847 located in the E8 rack of the aft equipment center (Ref 49-61-07/401).
S 866-137
(9) Turn the DUCT PRESS slot screw in the clockwise direction from "A" to "E" on the back of the APU Controller, M7847.
S 426-024
(10) Install the APU Controller, M7847 (Ref 49-61-07/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 866-024
(11)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P83 Panel, E8 Aft Equipment Center
1) APU PRIMARY CONT
2) APU START
S 866-025
(12)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P6 Main Power Distribution Panel
1) 6K18 APU ALTN CONT
E.
Do the Leakage Check of the Pneumatic Manifold
S 216-025
(1)
Get access to the 21 ECS, SUPPLY, EICAS MAINT PAGES to display the pneumatic manifold pressure (AMM 45-10-00/201).
S 826-026
(2)
Set your stop watch or the pilot's clock to measure elapsed time (Ref 31-25-00/001).
S 866-027
(3)
Start the APU (Ref 49-11-00/201).
(a)
Let the operation of the APU become stable.
S 356-254
WARNING: MAKE SURE PERSONNEL AND EQUIPMENT ARE CLEAR OF THE APPLICABLE
_______ ENGINE INTAKE AND EXHAUST. ENGINE ROTATION MAY RESULT IN INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4) Pull the applicable engine start switch. (SIMULATED START)
NOTE: The MANIFOLD DUCT PRESSURE on both sides should read
____
approximately 33-35 psig.
S 866-007
(5)
After the duct pressure is stable, put the APU VALVE switch to the OFF position.
S 216-008
(6)
Monitor the MANIFOLD DUCT PRESSURE on the auxiliary EICAS display and let the duct pressure fall to 30 psi by natural decay.
(a)
When the duct pressure reaches 30 psi, begin the stop watch or the pilot's clock to check the time necessary for the duct pressure to drop to 15 psi.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 796-009
(7)
If the time noted is 17 +/-5 seconds, the system is acceptable. If not do one, two, or three of the tests as follows:
(a)
Do the Pneumatic Duct Leakage Test (AMM 36-11-00/501).
(b)
Do the Check of Engine 1 or Engine 2 for Duct Leakage test (AMM 36-11-00/601).
(c)
Do the Check of Engine 3 or Engine 4 for Duct Leakage test (AMM 36-11-00/601).
S 866-034
(8) Release the pressure from the pneumatic system if it is no longer necessary for other operations (Ref 36-00-00/201).
F. Check of Engine 1 or Engine 2 for Duct Leakage.
NOTE: Check the duct leakage for each engine separately.
____ S 016-011
(1)
Open the fan cowl panel (Ref 71-11-04/201).
S 016-012
(2)
Open the core cowl panel (Ref 71-11-06/201).
S 016-010
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
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