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A 737-300/400/500MAINTENANCE MANUAL
Pitot-Static System
Figure 101
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F41840
A
737-300/400/500MAINTENANCE MANUAL
PITOT-STATIC SYSTEM - FAULT ISOLATION
_____________________________________
1. General_______
A. This subject has one task. The task is to isolate a fault in the pitot-static system.
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A 737-300/400/500MAINTENANCE MANUAL
PITOT-STATIC SYSTEM - MAINTENANCE PRACTICES
___________________________________________
1. General
_______
A. This subject gives 2 tasks. The first task is to flush the pitot-static system which removes unwanted material from the system. The second task is to drain the pitot-static system to remove the collected liquid from the system.
TASK 34-11-00-172-072
2. Flush the Pitot Static System
_____________________________
A. General
(1) You can flush the system and do a leakage tolerance check at the same time, when it is necessary. You do not have to flush the system before each system leakage check. You do not have to flush the system whem you replace pitot-static instruments or seal caps.
B. Standard Tools and Equipment
(1) Dry air pressure source, 0 to 15 pounds per square inch with filter and gage for measuring pressure.
C. Prepare to Flush the Pitot Static System
S 862-030
(1) Do these steps to prepare the pitot-static hoses:
(a)
Disconnect the pitot-static hoses from their relative components.
(b)
Seal each hose with a cap.
S 862-031
(2)
Remove the quick-disconnect hose fittings from the hoses.
S 862-032
(3)
Temporarily attach the hoses to prevent movement.
S 862-036
(4)
In the flight compartment, disconnect these instruments from the pitot-static system:
(a)
The combined standby altimeter/airspeed indicator.
(b)
The cabin altimeter and differential pressure indicator.
(c)
In the electronics comparment, disconnect these instruments from the pitot-static system: 1) The air data computers. 2) The electronic pressure controller. 3) The flap load limiter airspeed switch.
(d)
Disconnect the hoses from the pitot and static system drain fittings.
(e)
Disconnect the static system hoses from the alternate static ports.
(f)
Remove the four pitot-static probes (34-11-11, Pitot Static Probe - Removal/Installation).
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737-300/400/500MAINTENANCE MANUAL
(g) Disconnect the pitot and static hoses from all four of the pitot-static tubes.
S 862-039
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