(2)
When there is a duct failure, the applicable conditioned air check valve must be removed and inspected.
(3)
There is a conditioned air check valve for each of the three air conditioning packs.
(a) There is one conditioned air check valve found downstream of each air cooling pack, near the forward bulkhead of the ECS bay.
(4)
There is one aft cargo compartment conditioned air check valve.
(a) To get access to the check valve, you must go through the forward right sidewall lining in the aft cargo compartment.
TASK 05-51-23-212-008
2. Conditioned Air Check Valve Conditional Inspection__________________________________________________
A. References
(1)
AMM 21-21-01/401, Conditioned Air Check Valve
(2)
AMM 21-28-07/401, Aft Cargo Compartment Conditioned Air Check Valve
B. Access
(1)
Location Zones
142 Aft Cargo Compartment, RH
(2)
Location Zone
135 Wing Landing Gear Well, LH
136 Wing Landing Gear Well, RH
241 Passenger Cabin Second to Third Door, LH
242 Passenger Cabin Second to Third Door, RH
C. Procedure
S 022-002
(1)
Remove the conditioned air check valve for inspection (AMM 21-21-01/401).
S 022-006
(2)
If installed, remove the aft cargo compartment conditioned air check valve for inspection (AMM 21-28-07/401).
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A 747-400 MAINTENANCE MANUAL
(3) S 212-003Do a visual inspection of the conditioned air check valve.
NOTE:____ If there is damage to the valve, the valve must be replaced.
(a) Look for: - missing parts - cracks - corrosion - flapper deformation - restricted flapper movement.
(4) S 422-004Install the conditioned air check valve (AMM 21-21-01/401).
(5) S 422-007Install the aft cargo compartment conditioned air check valve (AMM 21-28-07/401).
(6) S 842-005Put the airplane back to its usual condition.
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A
747-400 MAINTENANCE MANUAL
CABIN DEPRESSURIZATION CONDITION - MAINTENANCE PRACTICES
________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General
_______
A. One task is supplied in this procedure. The task is cabin
depressurization conditional inspection.
NOTE: This examination applies only when cabin depressurization
____
occurs because of the outflow valve.
B. The cabin depressurization conditional inspection examines these items:
(1)
Inflight Depressurization Blowout Panels
(2)
Sidewall Dado Panels
(3)
Containerized Cargo Compartment Sidewall Panels
(4)
Containerized Cargo Compartment Insulation
(5)
Containerized Cargo Compartment Lining
(6)
Outflow Valve
TASK 05-51-24-202-001
2. Cabin Depressurization Conditional Inspection
_____________________________________________
A. References
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