(b)
Make sure the fitting is clean and does not have any contamination on the surface.
TASK 34-11-00-795-001
2. The Pitot-Static System Full-Range 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)
(b)
Static port test adapter - NAVAIDS, P/N 33410LH-125-4 (3 required)
(2)
Pneumatic Test Set
(a)
Dry air pressure source, - 30 to 35 inches of mercury (absolute)
(b)
Vacuum source, 10 to 30 inches of mercury (absolute) (2 required)
(3)
Gages
(a)
Pitot system test gage - required to indicate 10 to 34 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.
(c)
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.
(4)
Flow restrictors, control valves, cutoff valves, and pressure tape as required.
(5)
MS21913D6 plug (3/8") (2 required)
B. Consumable Materials
(1)
G00000, Soft rag for wiping off pitot-static probe
(2)
G02321, Vinyl Adhesive Tape
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FLOWSTATICRESTRICTOR
CUTOFFVALVE
Pitot-Static System - Test Equipment Connection
Figure 501
A
747-400
MAINTENANCE MANUAL
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MAINTENANCE MANUAL
C. References
(1) 34-11-01/601, Pitot-Static Probe
D. Access
(1) Location Zone 115 Area Between Nose Gear Well and Fuselage Left 116 Area Between Nose Gear Well and Fuselage Right 121 Forward Cargo Container Compartment Forward Half 122 Forward Cargo Container Compartment Forward Half 312 Area Aft of Pressure Bulkhead
E. Prepare for the Test
S 865-278
CAUTION: MAKE SURE THAT YOU DO NOT APPLY ELECTRICAL POWER TO THE
_______ PITOT-STATIC PROBE HEATERS. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC PROBES.
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
WARNING: MAKE SURE THAT YOU DO NOT APPLY ELECTRICAL POWER TO THE
_______ FLIGHT CONTROLS. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(a) P6 Main Power Distribution Panel
1) 6D30 PROBE HEAT PITOT L
2) 6D31 PROBE HEAT PITOT R
3) 6D32 PROBE HEAT AUX PITOT L
4) 6D33 PROBE HEAT AUX PITOT R
5) 6E01 PRIM T/E FLAP CONT AC
6) 6E02 PRIM T/E FLAP CONT DC
(b) P7 Overhead Circuit Breaker Panel
1) 7C10 FLT CONT ELEC 2LAC
2) 7C12 FLT CONT ELEC 1LAC
3) 7C14 FLT CONT ELEC 1RAC
4) 7C16 FLT CONT ELEC 2RAC
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747-400 MAINTENANCE MANUAL
S 485-002
WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
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