S 205-175
(4)
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).
S 865-176
(5)
Close the STALL WARNING NO. 1 and NO. 2 circuit breakers on load control panels P6 and P18.
S 865-317
(6)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
TASK 34-11-00-795-179
8. The First Officer's 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
(2)
34-11-11/601, Pitot-Static Probe
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A
737-300/400/500MAINTENANCE MANUAL
C. Prepare for the Test
S 865-180
(1) Supply electrical power (Ref 24-22-00/201).
S 865-183
CAUTION: YOU MUST OPEN THE DIGITAL STALL WARNING COMPUTER (DSWC) CIRCUIT
_______ BREAKERS. YOU CAN CAUSE THE DSWC TO FAIL THE SELF-TEST UNTIL IT IS SET AGAIN.
(2) Open the STALL WARNING NO. 1 and NO. 2 circuit breakers on load control panels P6 and P18.
S 485-337
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.
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
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.
(3)
Seal the forward static ports (S1) in the upper right pitot-static probe with vinyl adhesive tape.
S 485-188
(4)
Seal the forward static ports (S1) in the lower left pitot-static probe with vinyl adhesive tape.
S 485-189
(5)
Use these steps to connect the pneumatic test set to the first officer's 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 first officer's static system drain fitting to the static cutoff valve through the static system test gage and flow restrictor.
NOTE: The First officer's static system drain fitting is found
____ on the right forward end of the nose wheel well.
(c) Open the static cutoff valve.
D. The First Officer's Static System (Low-Range) Leak Test
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A 737-300/400/500MAINTENANCE MANUAL
S 865-190
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.
(1) Apply a vacuum to the first officer's static system equal to 5,000 feet of altitiude above field elevation (ambient pressure minus
5.25 |0.25 in. Hg).
S 865-192
CAUTION: HOLD THE PRESSURE, AS AN ALTERNATIVE, BEHIND THE CUTOFF VALVES
_______ DURING THE CUTOFF TIME. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT WHEN YOU OPEN THE CUTOFF VALVES WITHOUT THE PRESSURE.
(2)
Close the static cutoff valve to the system when the necessary altitude is reached.
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