21-32-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 CAUTION: DO NOT DAMAGE THE AIRPLANE SKIN OR LET PARTICLES GET INTO
_______ THE INTEGRAL SENSE TUBE. IF PARTICLES GET INTO THE TUBE, IT COULD CAUSE THE RELIEF VALVE TO FAIL.
 (a)  
Grind off the end of the tube until it is less or equal to .02 inches past the airplane skin.

 (b)  
Restore the chamfer to the end of the tube.

 (c)  
Do these steps to the inner and outer surface of the last 0.3 inches of the tube: 1) Use the solvent to clean the tube. 2) Apply one coat of the type I primer. 3) Apply one coat of the type II primer to the outer surface. 4) Apply one coat of the enamel to the outer surface.

 S 032-015
 (7)  Remove the cap from the remote sense tube.
 S 432-016
 CAUTION: DO NOT TWIST OR KINK THE SENSE TUBE WHEN THE NUT IS INSTALLED.
_______
 A DAMAGED SENSE TUBE COULD CAUSE THE VALVE TO FAIL.

 (8)  
Connect the remote sense tube to the valve at the primary metering section.

 S 822-022

 (9)  
Make sure the remote sense tube is at a 3-degree or greater slope towards the remote sensor port.

 S 712-049

 (10)
 Do this task:  Static System Leak Check - Positive Pressure Relief Valve (AMM 21-32-01/201).

 NOTE: This leak check will determine if there is air leakage at the
____ connection of the remote ambient sense tube to the positive pressure relief valve, and in the remote ambient sense tubes between the static pressure port and the positive pressure relief valves.
 E. Put the airplane back to its usual condition.
 S 412-018
 (1)
Install the duct(s) that were removed to get access to the valves.

 S 412-019

 (2)  
Install the left sidewall lining in the aft cargo compartment (AMM 25-50-02/401).

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757 MAINTENANCE MANUAL
 S 412-020
 (3)  Close the aft cargo door, 822 (AMM 06-46-00/201).
 TASK 21-32-01-702-050
 4. Static System Leak Check - Positive Pressure Relief Valve
_________________________________________________________
 A. General
 (1)  
This procedure does a leak check of the static system for the positive pressure relief valve.

 (2)  
This procedure will determine if there is air leakage in the remote ambient sense tubes between the remote static pressure port and the positive pressure relief valves.

 (3)  
If you replaced both positive pressure relief valves with two new valves which were successfully tested off-aircraft as outlined in the Vendor component maintenance manual, you can use this procedure as an alternate test to the Positive Pressure Relief Valve - System Test in AMM 21-32-01/201.

 B.
Equipment

 (1)  
33410MC-125-4 Adapter - Static Port, or equivalent

 NOTE: The adapter is included with the Vacuum Tank - Positive
____ Pressure Relief Valve Test Equipment, A21010.
 (2)  
Tester - Pitot/Static, or equivalent vacuum source

 C.
Access

 (1)  
Location Zones
 153 Aft Cargo Compartment (left)

 D.
Procedure

 S 212-051
 (1)  
Make sure the static pressure port is free of blockage or contamination.

 (2)
Connect the static port adapter to the static pressure port.

 S 482-052
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 S 482-053
 (3)  
Connect the pitot/static tester (or equivalent vacuum source) to the static port adapter.
　
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