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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
(i)
Remove the seal from the S2 port of the upper left pitot-static probe.
(j)
Make sure that the indication on the test set vacuum gage drops to field elevation.
S 865-140
CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE STATIC PRESSURE CHANGES LESS THAN 5000 FEET FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
(4)
Open the static cutoff valve.
S 865-307
(5)
Put the alternate No. 1 static system to ambient pressure.
S 085-141
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.
(6) Disconnect the pneumatic test set from the test fitting.
S 085-142
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.
(7) Remove the vinyl adhesive tape from these locations:
(a) The forward static ports (S1) in the lower right pitot-static probe.
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747-400 MAINTENANCE MANUAL
(b) The aft static ports (S2) in the upper left pitot-static probe.
S 215-143
(8) Examine the pitot-static probe static port for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-01/601).
H. The Auxiliary No. 2 Static System Cross-Manifold Test
S 485-512
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 ON 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 PITOT DRAINS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
(1) Seal these locations with vinyl adhesive tape:
(a)
The forward static ports (S1) in the lower left pitot-static probe.
(b)
The aft static ports (S2) in the upper right pitot-static probe.
S 485-145
(2) Connect the pneumatic test set to the auxiliary No. 2 static system test fitting.
(a) Connect the static (vacuum) source in the pneumatic test unit through the static control valve to the static cutoff valve.
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747-400 MAINTENANCE MANUAL
(b) Connect the quick-disconnect test fitting of the auxiliary No. 2 static system to the static cutoff valve through the static system test gage and flow restrictor.
NOTE: You will find the test fitting on the right side of the
____ airplane above the system drains at STA 400.
(c) Open the static cutoff valve.
S 795-146
(3) Do a test of the auxiliary No. 2 static system manifold.
CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR
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