(b)
Close the static cutoff valve to the system when the instrument shows the necessary altitude.
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 LOSS OF SAFE FLIGHT.
(c)
Remove the seal from the S1 port of the lower left pitot-static probe.
(d)
Make sure that the indication on the test set vacuum gage drops to field elevation.
WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT
_______ CONDITION IS VISIBLE FORM 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 lower left pitot-static probe again.
(f)
Open the static cutoff valve.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400
MAINTENANCE MANUAL
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.
(g)
Apply vacuum to the auxiliary No. 2 static system equivalent to 100 feet of altitude above field elevation.
(h)
Close the static cutoff valve to the system when the instrument shows the necessary altitude.
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 LOSS OF SAFE FLIGHT.
(i)
Remove the seal from the S2 port of the upper right pitot-static probe.
(j)
Make sure that the indication on the test set vacuum gage drops to field elevation.
S 865-147
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 865-308
(5)
Put the auxiliary No. 2 static system to ambient pressure.
S 085-148
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.
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747-400 MAINTENANCE MANUAL
S 085-513
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 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.
(7) Remove the vinyl adhesive tape from these locations:
(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.
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