3. Job Set-up
__________
Subtask 28-42-44-941-053
A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
(1) You must obey the fuel safety procedures (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Make sure that the safety barriers are in position.
Subtask 28-42-44-860-051
B. Aircraft Maintenance Configuration
(1)
Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-1QL, 2QL, 3QL, 1QT, 2QT and 8QT.
(2)
Make sure that the applicable fuel tank is defueled (Ref. TASK 28-25-00-650-001) .
(3)
Make sure that the access platform is below the applicable cover 147AZ (148AZ).
(4)
Make sure that the applicable access panels 147AZ (148AZ) have been removed (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-000-001).
4. Procedure
_________ R **ON A/C 001-049, 051-061, 101-105, 201-203,
(Ref. Fig. 402/TASK 28-42-44-991-004)
**ON A/C 301-399,
(Ref. Fig. 402A/TASK 28-42-44-991-004-B)
1EFF : ALL 1 28-42-44Page 449 1 1 May 01/05 1 1 1CES 1
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499, Post SB 28-1087 For A/C 001-049,051-061,101-105,201-203, (Ref. Fig. 402B/TASK 28-42-44-991-004-A) **ON A/C ALL
Subtask 28-42-44-420-054
A. Preparation for Installation WARNING : USE A PROTECTIVE EYE SHIELD/GOGGLES WHEN YOU USE COMPRESSED
_______ AIR. DEBRIS AND/OR HIGH PRESSURE AIR CAN DAMAGE YOUR EYES.
WARNING : DO NOT PUT COMPRESSED GAS IN CONTACT WITH YOUR SKIN. THE GAS
_______ CAN GO THROUGH THE SKIN AND MAKE BUBBLES IN THE BLOOD. THIS CONDITION CAN KILL YOU.
(1)
Use a plastic spatula to remove the sealant at the interface of the electrical backshell (21) and the tank wall.
(2)
Use a MISCELLANEOUS (Material No. 19-003) made moist with CLEANING AGENTS (Material No. 11-026) to clean:
-
the electrical backshell (21)
-
the interface of the electrical backshell (21) and the tank wall.
(3)
Dry the cleaned areas with compressed air.
(4)
Make sure the parts retained from the removed component are clean and in the correct condition.
**ON A/C 001-049, 051-061, 101-105, 201-203,
Subtask 28-42-44-420-051
B. Installation of the Harness
(1) Use adhesive tape to secure the electrical connectors of the new harness (23) together. Attach the string to the end of the harness.
NOTE : This will help you to move the center tank harness through its
____
conduit.
1EFF : ALL 1 28-42-44Page 450 1 1 Aug 01/05 1 1 1CES 1
(2)
Use the string to pull the center tank harness (23) through its conduit (15). When you install the center tank harness make sure it does not catch.
(3)
Remove and discard the adhesive tape and the string from the harness (23).
(4)
Put the harness (23) in position.
(5)
If necessary remove the items that follow:
-
the screws (1), (2) and (10)
-
the washers (3)
-
the nut (11)
-
the loop-clamps (4), (5), (6), (7), (8), (9) and (14).
(6)
Put the loop-clamps (5), (6), (9) and (14) with the harness (23) in position.
(7)
If necessary put the loop-clamps (4), (5), (7), (8) and (9) with the harness (22) in position.
(8)
Install the screws (1), (2), and (10), the washers (3) and the nuts
(11) and tighten.
(9)
Make sure that the electrical connectors are clean and in the correct condition.
(10)
Connect the center tank harness 18QT:
(a)
Identify the cable ends for the probes 35QT and 39QT and connect them to the correct terminals (Ref. TASK 28-42-15-400-004), (Ref. TASK 28-42-15-000-002).
(b)
Identify the cable ends for the sensor 22QJ and connect them to the correct terminals (Ref. TASK 28-46-15-400-012).
(11)
Install the O-ring (17) on the electrical backshell (21).
(12)
Install the electrical backshell (21) in the applicable position.
(13)
Install the washer (18) and the nut (19).
(14)
TORQUE the nut (19) to between 9.6 and 10.7 m.daN (70.79 and 78.90 lbf.ft).
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