S 424-008
(2)
Put the densitometer in its position on the mounting bracket.
NOTE: Make sure the UP arrow on the densitometer is aligned
____
correctly.
S 434-009
(3)
Install the screws, washers, and nuts (4 locations) to attach the densitometer to the mounting bracket.
S 284-029
(4)
Measure the bonding resistance between the densitometer and the tank structure (faying surface bond) (SWPM 20-20-00).
NOTE: The bonding resistance must not be more than 0.010 ohm.
____
S 434-014
(5) Install the terminals of the FQIS wire bundles (8 locations) on the terminal stud of the densitometer.
NOTE: The terminal studs have different dimensions to prevent
____ errors in the installation. Install each terminal on the correct terminal stud.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-41-11
ALL ú ú 03 Page 404 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 434-015
(6) Tighten the nuts to these torque limits:
~........................................................... | TERMINAL | TORQUE | NUT SIZE | ............................................................. | SENSE | 6-8 pound-inches | 0.112-40 | ............................................................. | SENSE SHIELD | 12-15 pound-inches | 0.138-32 | ............................................................. | DRIVE -| 15-20 pound-inches | 0.164-32 | ............................................................. | DRIVE + | 25-30 pound-inches | 0.190-32 | ............................................................. | KR0 | 25-30 pound-inches | 0.190-32 | ............................................................. | KR1 | 15-20 pound-inches | 0.164-32 | ............................................................. | KR2 | 12-15 pound-inches | 0.138-32 | ............................................................. | KR3 | 6-8 pound-inches | 0.112-40 | 2....................…........................….............1
S 434-018
(7)
Install the nuts on the terminal block of the densitometer.
S 414-011
(8)
For the densitometer in the center wing tank, install the access doors in the spanwise beam, 131AZ and 131BZ (AMM 28-11-09/401).
S 864-012
(9)
Go out of and close the fuel tank (AMM 28-11-00/201).
E.
Operational Test
S 744-031
(1)
Do this CMCS ground test with the fuel tank(s) dry:
<FUEL QUANTITY IND (AMM 28-41-00/501).
(a)
If the ground test fails, with related CMCS densitometer messages, then do the corrective action per the 28-CMCS MESSAGE INDEX.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-41-11
ALL ú ú 01 Page 405 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) If the ground test passes, then continue.
S 654-032
(2) Add or transfer fuel to fully cover the densitometers (AMM 12-11-01/301), (AMM 28-26-00/201).
NOTE: Table 401 contains the minimum fuel quantity necessary to
____
cover the densitometers.
S 744-034
(3) Do this CMCS ground test again (with fuel in the tank): <FUEL QUANTITY IND (AMM 28-41-00/501).
NOTE: Do not do this test immediately after a refuel operation.
____ Let the densitometer values stabilize before you do this test.
(a)
If the ground test fails, with related CMCS densitometer messages, then do the corrective action per the 28-CMCS MESSAGE INDEX.
(b)
If the ground test passes, then the densitometer is
satisfactory.
~.............................................
| FUEL TANK | MINIMUM FUEL QUANTITY |
...............................................
| M1 AND M4 | 324 GALS (1227 LITERS) |
...............................................
| M2 AND M3 | 107 GALS (405 LITERS) |
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(135)
