(d)  
Set the L and R PACK switches to OFF.

 (e)  
Stop the APU (Ref 49-11-00/201).

 (f)  
Set the APU BLEED switch to OFF.

 S 862-026
 (16)
 Start the engines and let the engines operate at ground idle speed (Ref 71-00-00/201).

 S 862-027

 (17)
 Operate the air conditioning packs:

 NOTE: This procedure uses the engine bleed air to remove the
____ oil contamination from the conditioned air in the airplane.
 (a)  
Set the position of these switches on the P5-10 overhead panel as follows: 1) L and R PACK switches to AUTO 2) BLEED 1 and 2 switches to ON

 (b)  
Let the air conditioning packs operate until the conditioned air in the airplane has no smell of the oil contamination.

 (c)  
Set the L and R PACK switches to OFF.

 S 862-028
 (18)
 Stop the engines (Ref 71-00-00/201).

 S 862-029

 (19)
 Set these switches to OFF on the P5-10 overhead panel:

 (a)  
L and R PACK switches

 (b)  
RECIRC FAN

 S 212-030
 (20) Examine these components for oil contamination:
 (a)  Heat exchangers
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737-300/400/500MAINTENANCE MANUAL
 (b) Coalescer bags in the water separators
 S 102-032
 (21)
 Do the procedure again, if required, until the conditioned air in the airplane has no smell of the oil contamination.

 S 412-033

 (22)
 Close the access doors to the air conditioning bays.

 S 862-034

 (23)
 Remove the electrical power if it is not necessary (Ref 24-22-00/201).

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737-300/400/500MAINTENANCE MANUAL
 AIRPLANE ABILITY TO MAINTAIN CABIN PRESSURE
___________________________________________ IN FLIGHT ON SINGLE PACK OPERATION - TROUBLE SHOOTING
_____________________________________________________
 1.  General_______
 A.  Trouble shooting the airplane ability to maintain cabin pressure in flight on a single pack operation involves the air cycle system, the pneumatic supply system, the pressurization control system, and various airplane openings that could possibly be a source of leakage. An understanding of how the different components are interrelated as well as the function of each is needed to locate and correct problems in either system.
 2.  Preparation for Trouble Shooting________________________________
 A.  Supply electrical power (AMM 24-22-00/201).
 B.  Make sure that all air conditioning circuit breakers are on.
 C.  Make sure that all pressurization control system circuit breakers are on.
 3.  Trouble Shooting Chart (Fig. 101)
______________________
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A 737-300/400/500MAINTENANCE MANUAL
SYSTEM  REQUIREMENT MINIMUM  YES NO REQUIREMENT SATISFIED 
SINGLE PACK - LOW FLOW  ABLE TO MAINTAIN CABIN  CONFIDENCE IS HIGH THAT  CONFIDENCE IS LOW THAT 
MODE  DIFFERENTIAL PRESSURE OF  AIRPLANE WILL MAINTAIN  AIRPLANE WILL MAINTAIN 
3.9 - 4.1 PSID AND CABIN  PRESSURE WITH SINGLE PACK  PRESSURE ON SINGLE PACK 
RATE OF CHANGE IS NO  IN HIGH FLOW MODE WHILE  IN THE HIGH FLOW MODE AT 
MORE THAN -100 FEET/  AT CRUISE.  CRUISE.  EMPHASIS NEEDS 
　
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