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28-22-141 Page 602 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/94
FUEL LINE AND COUPLINGS - APPROVED REPAIRS
1. General
A. For fuel line repair procedures refer to 20-10-51 AR, or Overhaul Manual 28-00-10.
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Feb 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-141 Page 801
ENGINE FUEL FEED LINE BULKHEAD FITTING - REMOVAL/INSTALLATION
1. General
A. This procedure has tasks to remove and install the bulkhead fitting for each engine fuel feed line at the front spar.
B. It is recommended that two people do this procedure -one person in the tank and one person out of the tank.
2. Remove the Bulkhead Fitting (Fig. 401)
A. Procedure
(1)
Remove electrical power from the airplane (AMM 28-22-0/201).
(2)
Defuel all the fuel tanks (AMM 28-23-0/201).
(3)
Purge and prepare to go into the applicable tank (AMM 28-10-0/201).
WARNING: OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE FUEL TANK ENTRY PRECAUTIONS.
(4)
Get access to the bulkhead fitting.
(a)
In the fuel tank, remove the left (right) fuel tank access panel 7205 (7405) (access door No. 3) (AMM 12-31-61/201, AMM 28-11-11/401).
(b)
Out of the fuel tank, remove the left (right) panels 6212, 6301, 6241 (6512, 6401, 6541) (AMM 12-31-61/201, AMM 12-31-71/201).
(5)
From out of the fuel tank, do these steps:
(a)
Remove the sealant (if applied) from around the bulkhead fitting.
(b)
Remove the four bolts and washers and the gasket that attach the upper strut engine fuel feed line to the bulkhead fitting on the wing front spar.
(6)
From in the tank, do these steps:
(a)
Remove sealant (if applied) from around the bulkhead fitting.
(b)
Remove the lockwire (if installed) from between the nut of the bulkhead fitting and the engine fuel feed line.
(c)
Disconnect the engine fuel feed line from the bulkhead fitting at the wing front spar.
(d)
Remove the nut for the bulkhead fitting.
(7)
From out of the tank, remove the bulkhead fitting.
(a) Discard the O-rings.
501
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-142 Page 401
N95884 N96206
Engine Fuel Feed Line Bulkhead Fitting Installation 501
28-22-142 Figure 401 (Sheet 1) May 01/03
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 Engine Fuel Feed Line Bulkhead Fitting Installation
May 01/03 Figure 401 (Sheet 2) 28-22-142
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Install the Bulkhead Fitting (Fig. 401)
A. General
(1) This procedure installs the bulkhead fitting for the engine fuel feed line. It gives steps to prepare the surfaces of the front spar and the bulkhead fitting. These steps are necessary to satisfy the electrical bonding requirement on the bulkhead fitting for lightning protection. Service Bulletin SB 28A1174 also does these steps. If SB 28A1174 was completed for this airplane, it is not necessary to do these steps again.
B. Equipment
(1)
Bonding Meter -Explosion-safe (SWPM 20-20-00)
(2)
Brush - to apply coating
C. Consumable Materials
(1)
Coating Alodine 600, Type II, Class D
(2)
Sealant BMS 5-26, Type II or BMS 5-45, Class B
(3)
Primer BMS 10-20, Type II
(4)
Enamel Finish BMS 10-60, Type I or Type II
(5)
Abrasive, 320 grit or finer
D. Prepare to Install the Bulkhead Fitting (PRE-SB 28A1174)
(1)
Clean the threads and surfaces of the bulkhead fitting to supply good adhesion for the sealant (SWPM 2020-00).
(2)
If the flange of the bulkhead fitting has an anodic surface finish, polish the flange of the bulkhead fitting with 320 or finer abrasive to make a clean and flat bare metal surface all the way around the mating surface flange (SOPM 20-30-02 or SWPM 20-20-00).
NOTE: Remove the minimum quantity of material.
(3)
Clean the area on the wing front spar (in and out of the fuel tank) where the bulkhead fitting will be installed (SOPM 20-30-03 and SWPM 20-20-00).
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