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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 CONFIDENCE CHECK OF AIRPLANE ABILITY TO MAINTAIN CABIN PRESSURE
_______________________________________________________________ IN FLIGHT ON SINGLE PACK OPERATION - MAINTENANCE/PRACTICES
__________________________________________________________
 1.  General_______
 A.  The function of this procedure is to do a ground check of the capability of the air conditioning pack(s) to pressurize the airplane when it is in flight. This test can be accomplished prior to dispatch at an interval best determined by the operator.
 B.  This confidence check consists primarily of the three parts that follow:
 (1)  
Airplane pressurization to 4.0 psid with the right engine and the APU.

 (2)  
Comparison of the capability of the pack(s) to pressurize the airplane at low and high flow mode operation with engine bleed sources at ground and flight idle settings. The pack performance will be determined by the collection and comparison of the cabin pressure rate of change indications observed with the different pack modes. The cabin rate of change indications during the test are to be recorded on the data sheet of Figure 202.

 (3)  
Determination if the airplane is unable to maintain pressure due to a leaky cabin or a pack performance problem.

 C.  Figure 201 provides a graphical representation of the three parts of this confidence check.
 TASK 21-00-05-782-001
 2.  Airplane Dispatch with Single Pack Operation - Confidence Check_______________________________________________________________
 A.  References
 (1)  
AMM 05-51-91, Excessive Cabin Pressure Leakage

 (2)  
AMM 21-52-71/401, Turbofan Valve

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 27-51-00/501, Trailing Edge Flap System

 (5)  
AMM 32-00-01/201, Ground Lock Assemblies

 (6)  
AMM 36-05-00/201, Pressurize/Depressurize Pneumatic System

 (7)  
AMM 71-00-00/201, Power Plant

 B.  Airplane Pressurization
 S 862-002
 (1)  Prepare for airplane pressurization as follows:
 (a)  
Make sure that the nose and main landing gear are pinned (AMM 32-00-01/201).

 (b)  
Inspect the condition of the cargo door, main entry door, and service door seals for evidence of wear and tear. 1) Record the condition of the door seals on the data sheet of

 Figure 202.

 (c)  
Lower the bay doors for the air conditioning equipment.

 S 482-003
 (2)  Make sure that there is audio communication between the flight compartment personnel and ground personnel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

5.0
4.0
PSID
3.0
2.0
1.0
TIME
OUTFLOW VALVE IN MANUAL MODE
Airplane Dispatch with Single Pack Operation - Confidence Check Figure 201

K21786
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
AIRPLANE _____________ HOURS ____________ CYCLES _____________ DATE ____________ PART I - INITIAL CABIN PRESSURIZATION (0.0 TO 4.0 PSID)
CONDITION OF CARGO AND MAIN ENTRY DOOR SEALS ________________________________________________________
FLOW CONTROL VALVE INDICATOR MODULATION LEFT VALVE __________________ RIGHT VALVE _________________ ANY OBVIOUS AIR LEAK NOISE FROM INSIDE CABIN ________________________________________________________ ANY OBVIOUS LEAKS OUTSIDE AIRPLANE __________________________________________________________________ ESTIMATED TIME TO PRESSURIZE FROM 0.0 TO 4.0 PSID ____________________________________________________ BLEED SOURCE(S) USED TO ACHIEVE 4.0 PSID LEFT ENGINE RIGHT ENGINE APU
　
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