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A
737-300/400/500MAINTENANCE MANUAL
CONDITIONED AIR PACK OUTLET DUCT SYSTEM FAILURE - MAINTENANCE PRACTICES
_______________________________________________________________________
1. General
_______
A. This procedure contains the task to examine the applicable valves after an upstream duct failure.
(1)
The two cold air check valves are installed in the distribution bay just upstream of the mix muff.
(2)
The hot air check valves are installed in each of the air-conditioning bays.
(3)
These valves can be damaged when there is an upstream duct failure of the pack outlet.
(4)
When there is a duct failure, the applicable valve must be removed and inspected.
TASK 05-51-80-212-001
2. Cabin Air Check Valve Conditional Inspection
____________________________________________
A. References
(1)
AMM 21-21-04/401, Cold Air Check Valve
(2)
AMM 21-51-04/401, Hot Air Check Valve
B. Access
(1)
Location Zone (AMM 12-31-01/201)
210 Air-Conditioning Distribution Bay
(2)
Location Zones (AMM 12-31-01/201)
212 Left Air-Conditioning Equipment Bay
214 Right Air-Conditioning Equipment Bay
C. Procedure
S 022-002
(1)
Remove the applicable check valve for inspection
(AMM 21-21-04/401, AMM 21-51-04/401).
(2)
Do a visual inspection of the applicable check valve
S 212-003
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.
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