WARNING:_______ WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT
CONDITION IS VISIBLE FROM 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.
(b) Seal the forward static ports (S1) and the aft static ports (S2) with vinyl adhesive tape, at these locations: 1) The upper left pitot-static probe 2) The lower left pitot-static probe
CAUTION: MAKE SURE THAT YOU FLUSH THE PROBE ADAPTER WITH WATER
_______ BEFORE YOU ATTACH THE ADAPTER TO THE PROBE. YOU CAN CAUSE DAMAGE TO THE PROBE OR THE ADAPTER.
(c) Flush the pitot-static probe adapters with water.
NOTE: Use equal parts of water and ethylene glycol when the
____ temperature is between 32 degrees F and -40 degrees F.
(d) Install the probe adapters on the probes.
S 485-003
(3) Connect the pneumatic test set to the pitot-static probe adapters.
(a)
Connect the pitot (pressure) source in the pneumatic test unit through the pitot control valve to the pitot cutoff valve.
(b)
Connect the static (vacuum) source in the pneumatic test unit through the static control valve to the static cutoff valves.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-11-00
ALL ú ú 01 Page 506 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CAUTION: MAKE SURE THAT THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT
_______
FROM THE TEST HOSES. YOU CAN BEND OR TWIST THE
PITOT-STATIC PROBE OUT OF TOLERANCE.
(c)
Connect the pitot inlet of the pitot-static probe adapters to the pitot cutoff valve through the pitot system test gage and flow restrictor.
(d)
Connect the S1 and S2 inlets of the upper right and lower right pitot-static probe adapters to the static cutoff valves through static system test gages and flow restrictors.
(e)
Open the pitot and static cutoff valves.
S 485-004
(4) Install the static port test adapters on the static pressure ports.
WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT
_______ CONDITION IS VISIBLE FROM 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.
CAUTION:_______DO NOT EXTEND THE SEALS INTO THE STATIC PORTS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
(a)
Seal the left alternate static pressure port with vinyl adhesive tape.
(b)
Install the test adapter on the right alternate static pressure port.
(c)
Do one of these steps:
CAUTION: MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS
_______ BETWEEN 0 AND 10.19 INCHES OF HG (MERCURY) WHEN YOU DO NOT DISCONNECT THE ELEVATOR FEEL COMPUTER FROM THE PITOT SYSTEM. TOO MUCH DIFFERENTIAL PRESSURE CAN CAUSE DAMAGE TO THE ELEVATOR FEEL COMPUTER.
1) If you do not disconnect the auxiliary pitot hoses from the elevator feel computer; do these steps. a) Install the test adapters on the dedicated static
pressure ports. b) Seal the visco jet drains with vinyl adhesive tape.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-11-00
ALL ú ú 01 Page 507 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
2) Do these steps to disconnect the auxiliary pitot systems from the elevator feel computer: a) Disconnect the auxiliary pitot hoses from the elevator
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(36)
