BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 865-039
(8)
Close the STALL WARNING NO. 1 and NO. 2 circuit breakers on load control panels P6 and P18.
S 865-040
(9)
Close the FLAP LOAD RELIEF circuit breaker on the load control panel P6.
S 035-041
(10)
Remove the cap and connect the cabin altitude differential pressure indicator to its static pressure source.
S 435-042
(11)
Replace the drain fitting caps on all of the pitot-static system drains.
S 865-333
(12)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 34-11-00-865-044
3. The Captain's Pitot System Leak Test
____________________________________
A. Standard Tools and Equipment
(1)
Air data test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; 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
B. References
(1)
24-22-00/201, Manual Control
(2)
34-11-11/601, Pitot-Static Probe
C. Prepare for the Test
S 865-045
(1) Supply the electrical power (Ref 24-22-00/201).
S 865-050
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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 485-315
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
(3) Install the pitot-static probe adapter on the upper left pitot-static probe.
CAUTION: DO NOT EXTEND THE SEALS INTO THE PITOT DRAINS AND STATIC
_______ PORTS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
(a) Seal the pitot chamber drain hole on the bottom of the probe with vinyl adhesive tape.
NOTE: You will find the drain hole about 2.25 inches aft of
____
the probe tip.
CAUTION: MAKE SURE THAT YOU FLUSH THE PROBE ADAPTER WITH WATER
_______ BEFORE YOU ATTACH THE ADAPTER TO THE PROBE. YOU CAN CAUSE DAMAGE TO THE PROBE OR THE ADAPTER.
(b) Flush the pitot-static probe adapter with water.
NOTE: Use equal parts of water and ethylene glycol when the
____ temperature is between 32 degrees F and -40 degrees F.
(c) Install the probe adapter on the probe.
S 485-309
CAUTION: MAKE SURE THAT THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT FROM
_______ THE TEST HOSES. YOU CAN BEND OR TWIST THE PITOT-STATIC PROBE OUT OF TOLERANCE.
(4) Connect the pneumatic test set to the pitot-static probe adapter:
(a)
Connect the pitot (pressure) source in the pneumatic test set through the pitot control valve to the pitot cutoff valve.
(b)
Connect the inlet of the probe adapter to the pitot cutoff valve through the pitot system test gage and flow restrictor.
(c)
Open the pitot cutoff valve.
D. The Captain's Pitot System Leak Test
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 865-310
CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE PITOT PRESSURE CHANGE BELOW 300 KNOTS 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.
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