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 (l) Do a check of the areas which are difficult to get to.
 NOTE: These areas can also show leaks.
____
 1)  Look at the structure that is hidden by the wing-to-body fairing and the APU bulkhead.
 NOTE: You should look at these areas for potential
____ structure and seal leaks.
 (m) Do the Leakage Rate Analysis
 1)  Get the correction factor from Figure 202 to correct the time data. Do this if the test was done at field altitudes that are much higher than at the sea level.
 2)  Make a graph from the points that follow: a) The differential pressure data on the vertical axis of Figure 203 b) The time on the horizontal axis of Figure 203. 3) Make a straight line through the two axis points on Figure 203. 4) If the lines on the graph are in the Satisfactory Zone on Figure 203, the pressure leakage rate is satisfactory.
 F.  Put the Airplane Back to Its Initial Condition.
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MAINTENANCE MANUAL

 S 862-013
 WARNING: DO NOT DECREASE THE PRESSURE MORE THAN 1000 FEET A MINUTE (0.5
_______ PSI A MINUTE) . IF YOU DECREASE THE PRESSURE MORE THAN 1000 FEET A MINUTE (0.5 PSI A MINUTE), INJURY TO PERSONS OR DAMAGE TO THE AIRPLANE STRUCTURE CAN OCCUR.
 (1)  To release the pressure differential, put the MANUAL cabin altitude control switch to CLIMB. This will move the outflow valve to the open position. Monitor the valve position indicator on the panel, P5, to make sure the valve is fully open.
 NOTE: The CABIN pressure rate-of change must not be more than
____ 500 feet a minute. This will be shown on the cabin RATE indicator of the panel, P5.
 For the test, this rate can be increased if the last WARNING is obeyed.
 S 942-015
 (2)  
If it is necessary, remove the equipment used to apply the differential pressure.

 S 982-057

 (3)  
If the equipment cooling fans were selected from NORMAL to ALTERNATE, the switches must be returned to the NORMAL position.

 (4)  
Put all switches and circuit breakers back to their normal position.

 (5)  
Remove the electrical power if it is not necessary (Ref 24-22-00).

 S 862-059
 S 862-016
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MAINTENANCE MANUAL

 CONDITIONED AIR PACK OUTLET DUCT SYSTEM FAILURE - MAINTENANCE PRACTICES
_______________________________________________________________________
 1.  General
_______
 A.  This procedure contains the task to examine the cabin air supply check valve after an upstream duct failure.
 (1)  
The cabin air supply check valve can be damaged when there is an upstream duct failure of the pack outlet.

 (2)  
When there is a duct failure, the applicable cabin air supply check valve must be removed and inspected.

 (3)  
There is one cabin air supply check valve found downstream of each air cooling pack, near the forward bulkhead of the ECS bay.

 TASK 05-51-25-212-001
 2.  Cabin Air Supply Check Valve Conditional Inspection
___________________________________________________
 A.  References
 (1)  
AMM 21-51-15/401, Cabin Air Supply Check Valve

 (2)  
AMM 21-51-15/601, Cabin Air Supply Check Valve

 B.  Access
 (1)  
Location Zones 135/136 Environmental control systems (ECS) bay

 (2)  
Access Panels 193HL/194ER Environmental control system access doors

 C.  Procedure
 S 022-002
 (1)  
Remove the cabin air supply check valve for inspection (AMM 21-51-15/401).

 S 212-003

 (2)  
Do a visual inspection of the cabin air supply check valve (AMM 21-51-15/601).
　
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