36-12-01
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A 747-400 MAINTENANCE MANUAL
SEE B
PRECOOLER EXHAUST FLANGE
B
Engine Bleed Air Precooler Installation
Figure 601 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
S 046-013
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do this deactivation procedure for the thrust reverser for ground maintenance (78-31-00/201).
S 016-014
(2)
Open the fan cowl panels (Ref 71-11-04/201).
S 016-016
(3)
Open the core cowl panel (Ref 71-11-06/201).
S 016-015
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(4)
Open the thrust reverser (Ref 78-31-00/201).
S 866-004
(5)
Pressurize the pneumatic system with a ground air source
(Ref 36-00-00/201).
D. Do the Check for the Precooler
S 866-005
(1)
Manually open the PRSOV (Ref 36-11-04/201).
S 756-006
(2)
Listen to the fan air inlet and the exhaust duct for leakage.
NOTE: No leakage is permitted.
____
S 216-007
(3)
Examine the precooler and the hardware that is attached to it for cracks, dents, and other damage.
S 426-008
(4)
If it is necessary, replace the precooler (Ref 36-12-01/401).
E. Put the Airplane Back to Its Usual Condition
S 866-009
(1) Release the pressure in the pneumatic system (Ref 36-00-00/201).
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A
747-400 MAINTENANCE MANUAL
S 416-017
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(2)
Close the thrust reverser (Ref 78-31-00/201).
S 416-018
(3)
Close the core cowl panel (Ref 71-11-06/201).
S 416-019
(4)
Close the fan cowl panel (Ref 71-11-04/201).
S 446-020
(5)
Do the activation procedure for the thrust reverser (Ref 78-31-00/201).
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A
747-400 MAINTENANCE MANUAL
ENGINE BLEED AIR PRECOOLER - APPROVED REPAIRS
_____________________________________________
1. General
_______
A. This procedure contains the task to repair the precooler flange while the precooler is installed on-wing.
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