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.
(b) Remove the vinyl adhesive tape from the drain hole of the probe pitot chamber.
S 215-037
(8)
Examine the drain hole for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-01/601).
S 215-038
(9)
Make sure that the pitot-static probes do not show damage to the probe tip or the static ports (Ref 34-11-01/601).
S 865-039
(10)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6D31 PROBE HEAT PITOT R
2) 6E01 PRIM T/E FLAP CONT AC
3) 6E02 PRIM T/E FLAP CONT DC
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747-400 MAINTENANCE MANUAL
TASK 34-11-00-795-040
5. The Auxiliary No. 1 Pitot System Leak Test
__________________________________________
A. Standard Tools and Equipment
(1)
Adapters
(a) Pitot-static probe test adapter -Rosemount Engineering, P/N 884EE with RCF kit P/N 508 or, RCF Seals & Couplings, Inc., P/N 508747, (4 required)
(2)
Pneumatic Test Set
(a) Dry air pressure source, - 30 to 35 inches of mercury (absolute).
(3)
Gages
(a)
Pitot system test gage - required to indicate 10 to 30 inches of mercury (absolute) with an accuracy of |0.16 (readable to |0.03) inch of mercury or |5 (readable to |1) knots.
(b)
Differential pressure gage - required to indicate 10 inches of mercury differential pressure (minimum) with an accuracy of |0.010 inch of mercury.
(4)
Flow restrictors, control valves, cutoff valves, pressure tape and port seals as required.
B. Consumable Materials
(1) G00000, Soft rag for wiping off pitot-static probe
C. References
(1) 34-11-01/601, Pitot-Static Probe
D. Access
(1) Location Zone 115 Area Between Nose Gear Well and Fuselage, LH
E. Procedure
S 865-267
WARNING: MAKE SURE THAT YOU DO NOT APPLY ELECTRICAL POWER TO THE FLIGHT
_______ CONTROLS. FLIGHT CONTROL SURFACES CAN MOVE AUTOMATICALLY WHEN YOU PRESSURIZE THE PITOT-STATIC SYSTEM. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION: MAKE SURE THAT YOU DO NOT APPLY ELECTRICAL POWER TO THE PROBE
_______ HEATERS. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC PROBES.
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6D32 PROBE HEAT AUX PITOT L
2) 6E01 PRIM T/E FLAP CONT AC
3) 6E02 PRIM T/E FLAP CONT DC
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A
747-400
MAINTENANCE MANUAL
S 485-042
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
(2) Install the pitot-static probe adapter on the lower left pitot-static probe.
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.
(a) Seal the pitot chamber drain hole on the bottom of the probe with vinyl adhesive tape.
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