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05-51-80
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CABIN DEPRESSURIZATION CONDITION - MAINTENANCE PRACTICES
________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General
_______
A. One task is supplied in this procedure. The task is cabin
depressurization conditional inspection.
NOTE: Examine the cabin only when depressurization occurs
____
because of the outflow valve.
B. The cabin depressurization conditional inspection examines these items:
(1)
Inflight Depressurization Blowout Panels
(2)
Sidewall Dado Panels
(3)
Cargo Compartment Sidewall Panels
(4)
Cargo Compartment Insulation
(5)
Cargo Compartment Lining
(6)
Outflow Valve
TASK 05-51-81-202-001
2. Cabin Depressurization Conditional Inspection
_____________________________________________
A. References
(1)
21-31-11/401, Pressurization Outflow Valve
(2)
25-21-39/401, Sidewall and Ceiling Isulation
(3)
25-52-60/801, Cargo Compartments
(4)
25-52-60/001 Blowout Panel
B. Procedure
S 212-004
(1)
Examine the inflight depressurization blowout panels for movement (Ref 25-52-60/001).
S 212-003
(2)
Do a check to see if the sidewall dado panels are open (Ref 25-21-39/401).
S 212-002
(3)
Examine the cargo compartment for these conditions (Ref 25-52-60/801):
(a) Moved Sidewall Panels
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A 737-300/400/500MAINTENANCE MANUAL
(b) (c) Moved InsulationMoved Lining
(4) S 212-006Examine the outflow valve (Ref 21-31-11/401.
(5) S 212-005Examine the area around the outflow valve for damage.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
05-51-81
ALL ú ú 01 Page 202 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
EXCESSIVE CABIN PRESSURE LEAKAGE - MAINTENANCE PRACTICES
________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
A. 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.
TASK 05-51-91-702-001
2. Cabin Pressure Leak Test________________________
A. General
(1)
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 optional source to supply air to the air conditioning packs is the engine bleed air or an external air source.
(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.
(2)
Figure 201 shows how to get a correction factor used in connection with some test data. Figure 202 shows the straight line curves for the permitted airplane leakage rates.
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