(d)  
Put the APU switch to OFF.

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

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757
MAINTENANCE MANUAL

 S 422-012
 (9)  
Install the check valve that you removed from the pneumatic ground connector (AMM 36-11-03/401).

 S 862-013

 (10)
 Start the APU again (AMM 49-11-00/201).

 S 862-014

 (11)
 Set the APU switch to ON.

 S 862-015

 (12)
 Operate the left and right air conditioning packs:

 NOTE: this procedure uses the APU bleed air to remove the oil from
____
 the air conditioning system.

 WARNING: MAKE SURE THERE IS AN EXIT FOR THE CONDITIONED AIR IN THE
_______ AIRPLANE. ACCIDENTAL CABIN PRESSURIZATION CAN CAUSE INJURY TO PERSONS.
 (a)  
Make sure the pressurization outflow valve is open or a minimum of one passenger entry door is open.

 (b)  
Set the position of these switches on the overhead P5 panel as follows: 1) L and R PACK switches to STBY-C (or STBY-N) 2) TRIM AIR to ON. 3) L and R RECIRC FAN to ON.

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

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

 S 862-016
 (13)
 Start the engines and let the engines operate at ground idle speed (AMM 71-00-00/201).

 (14)
 Set the APU switch to OFF.

 S 862-017
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757 MAINTENANCE MANUAL
 S 862-018
 (15) 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 these switches on the overhead P5 panel as follows: 1) L and R PACK switches to STBY-C (or STBY-N) 2) L and R ENG bleed air switch 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 of OFF.

 S 862-019
 (16)
 Stop the engines (AMM 71-00-00/201).

 S 862-020

 (17)
 Set these switches to OFF on the overhead P5 panel:

 (a)  
TRIM AIR.

 (b)  
L and R RECIRC FAN.

 S 282-021
 (18)
 Examine these components for oil contamination:

 (a)  
Heat exchangers.

 (b)  
Recirculation air filter.

 (c)  
Galley vent fan filter.

 S 162-022
 (19)
 Clean the components or replace them if they have too much
 contamination.

 S 162-023

 (20)
 Do the procedure again until the conditioned air in the airplane has no smell of the oil contamination.

 D.
Put the Airplane Back to its Usual Condition.

 (1)  
Close the access doors to the air conditioning bays.

 S 862-025

 (2)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 412-024
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757 FAULT ISOLATION/MAINT MANUAL
DISTRIBUTION
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