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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
CAUTION:_______ MAKE SURE THAT YOU HOLD THE PRESSURE BEHIND THE CUTOFF
VALVE DURING THE CUTOFF TIME. YOU CAN CAUSE DAMAGE TO THE
EQUIPMENT WHEN YOU OPEN THE CUTOFF VALVE WITHOUT THE
PRESSURE.
(b)
Close the static cutoff valve to the system when the instrument shows the necessary altitude.
(c)
Stop for 5 to 6 minutes to permit the system to become stable.
(d)
Write the altitude.
(e)
Stop for 1 minute and read the altitude again.
(f)
Make sure that the altitude does not go down by more than 400 feet (0.20 in. Hg).
S 845-192
(6)
Open the static cutoff valve.
S 865-276
(7)
Put the auxiliary No. 1 static system to ambient pressure.
NOTE: You must release the pressure from the cutoff valves slowly.
____
S 845-193
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.
(8)
Disconnect the pneumatic test set from the test fitting.
S 865-373
(9)
Connect the auxiliary No. 1 static system to the input of the source select valve.
S 845-491
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.
(10) Remove the vinyl adhesive tape from these locations:
(a)
The forward static ports (S1) in the lower right pitot-static probe.
(b)
The aft static ports (S2) in the upper left pitot-static probe.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 845-196
(11)
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-01/601).
S 845-197
(12)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6D30 PROBE HEAT PITOT L
2) 6D33 PROBE HEAT AUX PITOT R
3) 6E01 PRIM T/E FLAP CONT AC
4) 6E02 PRIM T/E FLAP CONT DC
TASK 34-11-00-795-199
10. The Auxiliary No. 2 Static System Leak Test (Full-Range)
________________________________________________________
A. Standard Tools and Equipment
(1)
Pneumatic Test Set
(a) Vaccum source, 10 to 30 inches of mercury (absolute)
(2)
Gages
(a) Static system test gage - required to indicate 10 to 30 inches of mercury (absolute) with accuracy of |0.1 (readable to |0.01) inch of mercury or |200 (readable to |20) feet.
(3)
Flow restrictors, control valves, cutoff valves, and pressure tape as required.
B. References
(1) 34-11-01/601, Pitot-Static Probe
C. Access
(1) Location Zone 115 Area Between Nose Gear Well and Fuselage, LH 116 Area Between Nose Gear Well and Fuselage, RH 118 Electrical and Electronics Compartment, RH
D. Procedure
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