S 794-083
(20)
Do the steps that follow to make sure there are no leaks at the connections for the precooler:
(a)
Use the ground air to pressurize the pneumatic system
(AMM 36-05-00/201).
(b)
Put the PACK switches to the OFF position.
(c)
Put the BLEED switches to the OFF position.
(d)
If it is necessary, open the isolation valve.
(e)
Do the check for leakage at the precooler connections.
NOTE:____Diffused leakage is permitted. Jet blast leakage must be repaired.
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36-12-25
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
BLEED AIR DISTRIBUTION SYSTEM AND PRECOOLER - ADJUSTMENT/TEST
_____________________________________________________________
1. General
A. This procedure contains these tasks:
(1)
The inspection of the engine bleed air precooler for allowable crack location.
(2)
A test to find if the level of leakage from the engine bleed air distribution system is within acceptable limits.
(3)
A check for leakage from the pneumatic duct sections and valves.
B. A precooler with internal crack locations and leakage levels that are within acceptable limits is permitted for continued operation.
C. A precooler with external crack locations that are within acceptable limits is permitted for limited operation.
TASK 36-12-25-215-049
2. Bleed Air Precooler Inspection for Cracks
_________________________________________
A. General
(1) This procedure inspects the precooler for allowable crack locations.
B. References
(1)
AMM 12-31-01/201, Zone Diagrams
(2)
AMM 36-05-00/201, Pneumatic System
(3)
AMM 36-12-25/401, Bleed Air Precooler
(4)
AMM 71-11-02/201, Fan Cowl Panels
(5)
AMM 78-31-00/201, Thrust Reverser System
C. Access
(1)
Location Zones
502/503 Fan Cowls - Left Nacelle
504/505 Thrust Reversers - Left Nacelle
602/603 Fan Cowls - Right Nacelle
604/605 Thrust Reversers - Right Nacelle
(2)
Access Panels
5737/5837 Fan Cowl Assy
5738/5838 Thrust Reverser Cowl Assy
5739/5839 Thrust Reverser Cowl Assy
5746/5846 Fan Cowl Assy
D. Procedure
S 045-042
WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF
_______ THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
FLIGHT COMPARTMENT
BBA FULL OPEN RAM DOORRAM DOOR FULL OPENBLEED DUAL
L RECIRC FAN AUTO A A A A A A APU OVHT OFF BLEED TRIP OFF HIGH AUTOAUTO L PACK OPEN AUTO CLOSE VALVE ISOLATION R PACK TEST 100 80 6040 PSI TRIP ICE ANTI WING ICE ANTI BLEED OVERHEAT WING-BODY TRIP OFF PACK TRIP OFF BLEED 2 ON OFF OVERHEAT WING-BODY TRIP OFF PACK HIGH OFF 1 ON OFF 0 RESET WING R RECIRC FAN OFFOFF AUTO 1
GGAA AUTO STANDBY MANUAL DESCENT OFF SCHED FAIL
737-400 ONLY
Pressurizing Components Location Figure 501
G99629
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