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 NOTE: Titanium parts include ducts in the wheel well areas, engine
____ fan case, and firewalls. Also included are the ducts in the aft fuselage between the pressure bulkhead and the APU firewall. Other titanium parts are some strut attach fittings and spar webs, landing gear beam, APU support structure, and stabilizer links.
 (a)  Signs of hydraulic fluid contamination are a light glossy brown film, or a dull black carbonaceous residue. Also look for a bare surface on painted titanium ducts.
 S 142-002
 (2)  
Remove the hydraulic fluid residue. Use acetone and wooden or plastic scrapers.

 S 902-003

 (3)  
Replace all parts that show paint deterioration and/or metal that is etched.

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757 MAINTENANCE MANUAL
 EXCESSIVE CABIN PRESSURE LEAKAGE - MAINTENANCE PRACTICES
________________________________________________________
 TASK 05-51-24-702-001
 1. Excessive Cabin Pressure Leakage Test
_____________________________________
 A. General
 (1)  This procedure gives steps to do a leakage test to the airplane fuselage. This leakage test is used to make sure the fuselage pressurized areas are tight and there are no large leaks.
 WARNING: OBEY ALL SAFETY STANDARDS FOR COMPRESSION AND DECOMPRESSION
_______ WHEN PERSONS ARE IN A PRESSURIZED AREA. SUDDEN PRESSURE CHANGES WILL CAUSE PAIN AND INJURY AND MUST NOT BE DONE. WHEN YOU DO NOT OBEY THE PRECAUTIONS, INJURY TO PERSONS WILL OCCUR.
 (2)  
When persons are in the airplane during this test, they must be in good physical condition.

 (3)  
When a person feels pain during a pressure change, you must lower the pressure or make it stable immediately. Do this to make sure the person can make the pressure equal in their ears.

 NOTE: Also, lower the pressure to remove the person from the
____
 airplane.

 (4)  This test uses the airplane equipment to pressurize the airplane and monitor the procedure.
 (a)  
The primary source to pressurize the airplane is the APU. An external pneumatic service cart or the engine bleed air can also be used.

 (b)  
The cabin differential pressure and the rates of pressurization and bleed-down are monitored in the control cabin. They are monitored on the differential pressure indicator, and the cabin rate indicator.

 B. Equipment
 (1)  Pneumatic Service Cart, capacity of 5.00 psig at 1000 SCFM flow, with a pressure gage, flowmeter.
 NOTE: Service cart is only necessary if the airplane
____ APU is not used as pressure source.
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757
MAINTENANCE MANUAL

 (2) Stop Watch
 C. References
 (1)
21-32-01/201, Positive Pressure Relief Valve

 (2)
AMM 21-51-00/601, Cooling Pack System

 (3)
24-22-00/201, Electrical Power - Control

 (4)
34-11-00/501, Pitot Static System

 (5)
49-11-00/201, Auxiliary Power Unit

 D. Prepare for the Test
 S 862-002
 (1) Supply electrical power (Ref 24-22-00).

757-200
Excessive Cabin Pressure Leakage
Figure 201

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757
MAINTENANCE MANUAL

 ú
 ú  S 862-003
 ú  (2)  757-200 AIRPLANES (See Fig. 201), Make sure the items that follow, for the forward and aft toilet service panel, are closed: (a) Toilet fill/shutoff valve (b) Toilet drain fitting (c) Toilet ground flush fitting.
　
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