(4)
Write the altitude.
S 865-265
(5)
Stop for Wait minute and read the altitude again.
S 865-266
(6)
Make sure that the altitude does not decrease by more than 80 feet
(0.07 in. Hg).
S 865-267 CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE STATIC PRESSURE CHANGE BELOW 5000 FEET FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.00 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
(7) Open the static cutoff valve and the send auxiliary No. 2 static system to ambient pressure.
NOTE: You must release the vacuum from the cutoff valves slowly.
____
E. Put the Airplane to Its Usual Condition
S 085-270 CAUTION: DO NOT DISCONNECT THE PNEUMATIC TEST SET WHEN THE PITOT-STATIC
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
(1) Disconnect the pneumatic test set from the drain fitting.
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A
737-300/400/500MAINTENANCE MANUAL
S 085-343
WARNING: FAILURE TO REMOVE VINYL ADHESIVE TAPE FROM STATIC PORTS BEFORE
_______ FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
CAUTION: MAKE SURE THAT YOU REMOVE ALL OF THE PIECES OF TAPE FROM EACH
_______ PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
(2)
Remove the vinyl adhesive tape from the aft static ports (S2) on the lower left pitot-static probe.
S 085-274
(3)
Remove the vinyl adhesive tape from the aft static ports (S2) on the upper right pitot-static probe.
S 215-275
(4)
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).
S 865-276
(5)
Close the FLAP LOAD RELIEF circuit breaker on the load control panel P6.
S 865-277
(6)
Remove electrical power if it is necessary (Ref 24-22-00/201).
TASK 34-11-00-795-278
11. The Alternate Static System Low-Range Leak Test
_______________________________________________
A. Standard Tools and Equipment
(1)
Air data test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; or equivalent
(2)
Flow restrictors, control valves, cutoff valves, and vinyl adhesive tape as required
B. References
(1) 24-22-00/201, Manual Control
C. Prepare for the Test
S 865-279
(1) Supply electrical power (Ref 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 485-344
WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. FAILURE TO OBSERVE AND REMOVE COVERINGS OVER STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
CAUTION:_______DO NOT EXTEND THE SEALS INTO THE STATIC PORTS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
(2)
Seal the left and right alternate static pressure ports with pressure tape.
S 485-282
(3)
Use these steps to connect the pneumatic test set to the alternate static system drain fitting:
(a)
Connect the static (vacuum) source in the pneumatic test unit through the static control valve to the static cutoff valve.
(b)
Connect the alternate static system quick-disconnect drain fitting to the static cutoff valve through the static system test gage and flow restrictor.
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