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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 865-331
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS OFF. YOU CAN CAUSE INJURY TO PERSONS.
CAUTION: MAKE SURE THAT THE SEALS DO NOT EXTEND INTO THE PITOT DRAINS OR
_______ STATIC PORTS. YOU CAN CAUSE DAMAGE TO THE SYSTEM.
(7) Install a pitot-static probe adapter on all four of the pitot-static probes.
(a) Seal the pitot chamber drain hole on the bottom of the probes with vinyl adhesive tape.
NOTE: You will find the drain hole about 2.25 inches aft of
____
the tip of the probe.
WARNING: WHEN YOU SEAL THE STATIC PORTS, MAKE SURE THIS CONDITION
_______ IS VISIBLE FROM THE GROUND. FAILURE TO SEE AND REMOVE THE SEAL FROM THE STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN THE SIGNALS FOR AIRSPEED AND ALTITUDE. THIS MAY LEAD TO LOSS OF SAFE FLIGHT.
(b) Seal the forward static ports (S1) and the aft static ports (S2) with vinyl adhesive tape at these locations: 1) The upper left pitot-static probe 2) The lower left pitot-static probe.
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.
(c) Flush the pitot-static probe adapters with water.
NOTE: Use equal parts of water and ethylene glycol when the
____ temperature is between 32 degrees F and -40 degrees F.
(d) Install the probe adapters on the probes.
S 845-020
(8) Connect the pneumatic test set to the pitot-static probe adapters:
(a) Connect the pitot (pressure) source in the pneumatic test unit through the pitot control valve to the pitot cutoff valve.
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ú ú 02 Page 505 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(b) Connect the static (vacuum) source in the pneumatic test unit through the static control valve to the static cutoff valves.
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.
(c)
Connect the inlet of the pitot-static probe adapters to the pitot cutoff valve through the pitot system test gage and flow restrictor.
(d)
Connect the S1 and S2 inlets to the static cutoff valves through the static system test gages and flow restrictors, from these locations: 1) The upper right pitot-static probe adapter. 2) The lower right pitot-static probe adapter.
(e)
Open the pitot and static cutoff valves.
S 845-021
(9) Connect the alternate static system to the cutoff valve:
WARNING: WHEN YOU SEAL THE STATIC PORTS, MAKE SURE THIS CONDITION IS VISIBLE FROM THE GROUND. FAILURE TO SEE AND REMOVE THE SEAL FROM THE STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN THE SIGNALS FOR AIRSPEED AND ALTITUDE. THIS MAY LEAD TO LOSS OF SAFE FLIGHT.
CAUTION: DO NOT EXTEND THE SEALS INTO THE STATIC PORTS. YOU CAN CAUSE DAMAGE TO THE STATIC PORT SURFACE WHEN YOU REMOVE THE SEALS.
(a)
Seal the left and right alternate static pressure ports with vinyl adhesive tape.
(b)
Install a static line on drain No. 5.
(c)
Connect the alternate static system to the static cutoff valve through the correct static system test gage and flow restrictor.
(d)
Open the static cutoff valve.
E. The Full-Range Pitot-Static System Leak Test
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