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A
747-400 MAINTENANCE MANUAL
E. Procedure
S 485-506
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 STATIC PORT. 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 upper left pitot-static probe.
(b)
The aft static ports (S2) in the lower right pitot-static probe.
S 485-124
(2) Connect the pneumatic test set to the captain's 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.
(b)
Connect the captain's static system test fitting to the static cutoff valve through the test gage and flow restrictor.
NOTE: You will find the test fitting on the left side of the
____ airplane above the system drains at STA 400.
(c) Open the static cutoff valve.
S 795-125
(3) Do a test of the captain's static system manifold
CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR
_______ MORE THAN THE STATIC LINE PRESSURE. KEEP THE STATIC SYSTEM CAHNGES 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.
(a) Apply vacuum to the captain's static system equivalent to 100 feet of altitude above field elevation.
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747-400
MAINTENANCE MANUAL
(b)
Close the static cutoff valve to the system when the necessary altitude is reached.
LOSS OF SAFE FLIGHT.
(c)
Remove the seal from the S1 port of the upper left pitot-static probe.
(d)
Make sure that the indication on the test set vacuum gage drops to field elevation.
WARNING:_______ FAILURE TO REMOVE THE VINYL ADHESIVE TAPE FROM THE STATIC
PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED
SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO
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.
(e)
Seal the S1 port on the upper left pitot-static probe again.
(f)
Open the static cutoff valve.
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.
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