3. Job Set-up
__________
 Subtask 28-13-43-869-050
 A. Aircraft Maintenance Configuration
 (1)
 Obey the fuel safety procedures (Ref. TASK 28-00-00-910-001).

 (2)
 Make sure that the access panel 148FB is open (Ref. TASK 53-35-13-000-001).

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 4. Procedure
_________
 (Ref. Fig. 401/TASK 28-13-43-991-001)
 Subtask 28-13-43-560-050
 A. Preperation for the Replacement Component
 WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
 (1)
 Remove the straight union (7) from the drain mast (5) and discard the O-ring (6).

 (2)
 Remove the sealant with a nonmetallic scraper from the mount base of the drain mast and from the fuselage.

 (3)
 Clean the mount base of the drain mast and the fuselage with CLEANING AGENTS (Material No. 11-003).

 (4)
 Make sure that the straight union (7) is in a clean and correct condition.

 (5)
 Apply a thin layer of COMMON GREASE (Material No. 04-006) to the new O-ring (6).

 (6)
 Install the O-ring (6) on the straight union (7).

 (7)
 Install the straight union (7) with SEALANTS (Material No. 09-003) on the drain mast (5).

 (8)
 Torque the straight union (7) to between 1.8 and 2.0 m.daN (13.27 and

 14.74 lbf.ft).

 (9)
 Apply STRUCTURE PAINTS (Material No. 16-003) to the installed and torqued straight union (7).

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 B. Installation of the Drain Mast
 (1)
 Preperation for installation

 (a)
 Remove the blanking plugs from the disconnected line ends.

 (b)
 Apply a thin layer of COMMON GREASE (Material No. 04-006) to the new O-ring (3).

 (c)
 Put the new O-ring (3) on the end of the center tank vent-pipe (2).

 (d)
 Apply COMMON GREASE (Material No. 04-006) to the end of the center tank vent-pipe (2).

 (e)
 Apply SEALANTS (Material No. 09-016) to the mount base of the drain mast (5).

 (2)
 Install the drain mast (5)

 (a)
 Carefully push the end of the center tank vent-pipe (2) into the drain mast (5) and install the drain mast to the fuselage.

 (b)
 Tighten the drain mast (5) with the four countersunk screws (4). NOTE : Make sure that the srews (4) are correctly bonded

____
 (Ref. TASK 20-28-00-912-004).

 (c)
 Seal the end of the center tank vent-pipe (2) with COMMON GREASE (Material No. 04-006) where it is attached into the drain mast (5).

 (d)
 Connect the APU vent-pipe (1) to the straight union (7) and torque the nut (8) to between 1.8 and 2.0 m.daN (13.27 and 14.74 lbf.ft).

 (e)
 Apply SEALANTS (Material No. 09-016) to the circumference of the drain mast.

 (f)
 Make sure that the outlets of the drain mast have no blockage.

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 5. Close-up
________ Subtask 28-13-43-410-050
 A. Close Access
 (1)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 (2)
 Install the access panel 148FB on the right side from the belly fairing (Ref. TASK 53-35-13-400-001).

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 MONITOR - LEAK (500QM) - REMOVAL/INSTALLATION
_____________________________________________ TASK 28-13-44-000-001 Removal of the Leak Monitor (500QM) WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
　
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