S 735-049
(4)
Use the fuel measuring sticks to calculate the fuel quantity for each of the tanks (AMM 28-44-00/001).
(a)
Write the values on a piece of paper.
S 865-050
(5)
Push the FUEL switch on the select module of the EICAS display to show the fuel synoptic on the main EICAS display.
S 225-178
(6)
Compare these fuel quantity values:
(a)
measured fuel quantity
(b)
indicated fuel quantity on the main EICAS display and P42 refuel control panel.
S 215-179
(7)
Make sure that the indicated fuel quantity and the measured fuel quantity are in these limits:
(a)
Reserve tanks No. 2 and 3 | 370 lbs (| 220 kgs).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-41-00
ALL ú ú 04 Page 515 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
Main tanks No. and 4 | 1030 lbs (| 520 kgs).
(c)
Main tanks No. 2 and 3 | 2640 lbs (| 1250 kgs).
(d)
Center wing tank | 3425 lbs (| 1675 kgs).
I.
Put the Airplane Back to Its Usual Condition
S 415-051
(1) Close the access door to the refuel control panel (521CB).
S 095-052
WARNING:_______REFER TO AMM 27-81-00/201 FOR LOCK REMOVAL PROCEDURE. FLAPS WILL RETRACT IN 7 SECONDS AND CAN CAUSE INJURY TO PERSONS OR EQUIPMENT.
(2)
Remove all of the leading edge flap safety locks, if they are not necessary (AMM 27-81-00/201).
S 865-054
(3)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 28-41-00-815-074
4. Tank Component Test for the Fuel Quantity Indicating System___________________________________________________________
A. General
(1)
This task contains procedures to isolate a tank unit, a compensator, or a densitometer failure.
(2)
This task contains these compensator and tank unit tests:
(a)
Compensator and Tank Unit Test (at the tank wall)
(b)
Compensator and Tank Unit Test (at the FQPU)
(3)
This task also includes these densitometer tests:
(a)
Densitometer Test (at the tank wall)
(b)
Densitometer Test (at the FQPU)
(4)
The test can isolate an FQIS problem to determine if the problem is in the tank or out of the tank. Make sure you do the test at the FQIS wire bundle connectors at the fuel tank walls (spar connector) and at the processor unit. This will make sure that maintenance is not done in the fuel tanks if it is not necessary.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-41-00
ALL ú ú 04 Page 516 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(5)
This task uses a PSD60-1, PSD60-2 or PSD60-2R field calibration unit.
(6)
The test procedure measures all the tank units and the compensators capacitance values. The indicated values are compared with Tables given in the task. The test procedure also makes sure the densitometers in the aircraft fuel tanks operate correctly.
(7)
The compenstor and tank unit tests are done with dry tanks. The densitometer tests must be done with the densitometer fully covered with fuel.
B.
Equipment
(1)
Field Calibration Unit - PSD60-1, PSD60-2, PSD60-2R
JCAIR
400 Industrial Parkway
Industrial Airport, Kansas, USA
66031
OFFICE (913) 764-2452
FAX (913) 782-5104
TELEX 750 797
(2)
Test Equipment Specfic to the 747-400 FQIS System:
(a)
PSD747-2, Interconnect Test Set, Controls, Indicator and Connectors
(b)
PSD747-20 Cable Assembly
(c) 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 燃油 FUEL 4(103)
