34-11-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

NOTE: AIRPLANE CONFIGURATION IS TYPICAL
Pitot Static System Test Connections
Figure 501

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-11-01

 ú ú 07 Page 502 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (6)  
The differential pressure between the pitot and static systems must not be larger than 10.00 inches of mercury.

 (7)  
The absolute pressure applied to a static system must not be more than ambient pressure when an instrument is connected to that static system.

 (8)  
The pressure in a static system must not be more than 32.10 inches of mercury.

 (9)  
Do not connect or disconnect equipment or indicators when you apply pressure or a vacuum to the pitot-static system.

 (10)
 AIRPLANES WITH STATIC SOURCE SELECT VALVES; You must not set the source selector valve to the ALTERNATE position when you apply a vacuum to a static system.

 (11)
 AIRPLANES WITH STATIC SOURCE SELECT VALVES; Make sure that the source selector valve stays in the NORMAL position unless the procedure tells differently.

 (12)
 Remove the drain fitting caps during the leak test.

 CAUTION: MAKE SURE THAT YOU DO NOT APPLY ELECTRICAL POWER TO THE
_______ PITOT-STATIC PROBE HEATERS. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC PROBES.
 (13)
 Make sure that the pitot-static probe heat is off during the test.

 (14)
 Make sure that the autopilot system is off during the test.

 WARNING: MAKE SURE THE ATC TRANSPONDERS ARE NOT IN AN ALTITUDE REPORTING
_______
 MODE WHEN YOU SIMULATE ALTITUDE. IF YOU DO NOT, YOU CAN
 ACCIDENTALLY CAUSE FALSE TCAS TARGETS.

 (15)
 Make sure the ATC transponders are not in an altitude reporting mode.

 (16)
 Make sure that the seals you use on the pitot drains and/or the static ports do not extend into the port.

 (17)
 Make sure that the surfaces around the static ports are not damaged when you remove the seals.

 (18)
 Make sure that you install flow restrictors between the cutoff valve and the pitot-static system.

 TASK 34-11-01-795-001
 2. The Pitot-Static System Full-Range Leak Test
____________________________________________
 A. Standard Tools and Equipment
 (1)  
Air data test set, Druck ADTS405F, Druck Ltd. (Vendor Code 0R667), Leicester, England; or equivalent

 (2)  
Pitot-static probe adapter kit, P/N AD-953-7, Nav-Aids Ltd., Montreal, Canada; or equivalent

 (3)  
Flow restrictors, control valves, cutoff valves, vinyl adhesive tape and port seals as required

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 NOTE: Flow restrictors, control valves, and cutoff valves must be
____ contained in the air data test set listed above.
 B. Consumables
 (1)  Vinyl Adhesive Tape, Red, 3M No. 471, 3 inches wide
 C. References
 (1)  
24-22-00/201, Manual Control

 (2)  
34-11-11/601, Pitot-Static Probe

 D. Prepare for the Test
 S 845-002
 (1)
Remove the drain fitting caps from the pitot-static system drains.

 S 845-004

 (2)  
Disconnect the cabin altitude differential pressure indicator from the static pressure source.

 S 845-006

 (3)  
Put a cap on the pressure source.

 S 865-332

 (4)  
Supply electrical power (Ref 24-22-00/201).

 S 865-329
 WARNING:_______YOU MUST OPEN THE FLAP LOAD RELIEF CIRCUIT BREAKER. YOU CAN CAUSE INJURY TO PERSONS.
　
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