34-11-00
ALL ú ú 02 Page 555 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(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 80
feet (0.07 in. Hg).
S 865-087
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.
(5)
Open the static cutoff valve.
S 865-300
(6)
Put the auxiliary No. 1 static system to ambient pressure.
S 085-088
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.
(7) Disconnect the pneumatic test set from the test fitting.
S 085-501
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.
(8) Remove the vinyl adhesive from these locations:
(a) The forward static ports (S1) in the lower right pitot-static probe.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-11-00
ALL ú ú 01 Page 556 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) The aft static ports (S2) in the upper left pitot-static probe.
S 215-090
(9)
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-01/601).
S 865-091
(10)
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 34-11-00-795-092
17. The Auxiliary No. 2 Static System Leak Test (Low-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
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址:747-400 AMM 飞机维护手册 导航 NAVIGATION 1(60)