28-44-00
ALL ú ú 01 Page 3 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
To determine the fuel level, the stick is gently raised until the magnetic latch is felt to engage. There is a positive feel in this position since the magnetic latch is strong and will jerk the stick into position. The stick is now read to determine fuel level in the tank.
(3)
If the measuring stick is being monitored during a refueling or defueling operation, the float and stick will move with the fuel level. However, since the magnetic attachment between the magnets of the stick and float causes a small friction against the housing, the stick and float will not move up smoothly with the fuel level, but in distinct jumps as the fuel level rises on the float to overcome the static friction. On declining fuel levels when defueling, friction will occur in the opposite direction. Calibration marks on the stick are set to read on rising fuel levels and the most accurate reading will be immediately after a jump of the stick. In main tanks No. 1, 2, 3, and 4 which contain three measuring sticks, when fuel is measurable on more than one stick, the stick reading highest must be selected for maximum accuracy.
(4)
The stick is returned to its original position by raising it into the base and with a slight pressure, the head is turned 90 degrees clockwise to lock the stick in place.
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28-44-00
ALL ú ú 01 Page 4 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUEL MEASURING STICK - REMOVAL/INSTALLATION
___________________________________________
1. General_______
A. This procedure contains two tasks.
(1)
The first task removes the measuring stick.
(2)
The second task install the measuring stick.
B.
Measuring sticks are found in each fuel tank, installed in a housing on the lower surface of the wing. The measuring stick for the center wing tank is installed in a housing at the bottom of the tank. For removal and installation procedures for the housings, refer to AMM 28-44-02/401.
C.
For all the measuring sticks but the one in the center wing tank, you can get access from the wing lower surface. Access to the measuring stick in the center wing tank is through an access panel below the lower left wing-to-body fairing.
D.
Each measuring stick is identified with a position number either on the head of the measuring stick, or on the side of the measuring stick in line with the part number.
E.
It is not necessary to defuel the applicable tank to remove a measuring stick from the housing.
TASK 28-44-01-004-001
2. Measuring Stick Removal (Fig. 401)_______________________
A. Equipment
(1)
727793T - Installation Tool, Kaiser Electroprecision, 17000 S. Red Hill Ave., Irvine, CA
B.
References
(1)
AIPC 28-44-01 Fig. 1
C.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right
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本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 4(157)
