S 485-159
(4)
Seal the forward static ports (S1) in the lower right pitot-static probe with pressure tape.
S 485-160
(5)
Use these steps to connect the pneumatic test set to the captain'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 captain's static system drain fitting to the static cutoff valve through the static system test gage and flow restrictor.
NOTE: The captain's static system drain fitting is found on
____ the left forward end of the nose wheel well.
(c) Open the static cutoff valve.
D. The Captain's Static System (Low-Range) Leak Test
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 865-160
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 captain's static system equal to 5,000 feet of altitude above field elevation (ambient pressure minus
5.25 |0.25 in. Hg).
S 865-162
CAUTION: HOLD THE VACUUM, 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 VACUUM.
(2)
Close the static cutoff valve to system when the necessary altitude is reached.
S 865-164
(3)
Stop for 5 to 6 minutes to allow the system to stabilize.
S 865-165
(4)
Write the altitude.
S 865-166
(5)
Stop for one minute and read the altitude again.
S 865-167
(6)
Make sure that the altitude does not decrease by more than 80 feet
(0.07 in. Hg).
S 865-168
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 send the captain's static system to ambient pressure.
E. Put the Airplane to Its Usual Condition
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 085-170
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.
S 085-338
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 forward static ports (S1) on the upper left pitot-static probe.
S 085-174
(3)
Remove the vinyl adhesive tape from the forward static ports (S1) on the lower right pitot-static probe.
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