(2)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (3)
 Do an inspection of the component interface and/or the adjacent area.

 (4)
 Lubricate the new O-rings that follow with FUELS (Material No. 01-001) or COMMON GREASE (Material No. 04-012) :

 -
FOR 23QA, 27QA
 the new O-ring (1) and the new O-ring (4)

 -
FOR 24QA, 28QA
 the new O-ring (1) and the new O-ring (4)

 -
FOR 39QA, 40QA the new O-ring (1) and the new O-ring (4).

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-15Page 413 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 1EFF : ALL 1 28-21-15Page 414 1 1 May 01/04 1 1 1CES 1

R  **ON A/C 301-399, 
R  Subtask 28-21-15-420-051-A 
R  A. Preparation for Installation 
R  WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL_______ 
R  MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. 
R  OBEY THE MANUFACTURERS INSTRUCTIONS. 
R  PUT ON PROTECTIVE CLOTHING. 
R  DO NOT GET THEM IN YOUR MOUTH. 
R  DO NOT SMOKE. 
R  DO NOT BREATHE THE GAS. 
R  THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. 
R  GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED. 
R  (1) Clean the component interfaces and the adjacent areas with a 
R  MISCELLANEOUS (Material No. 19-003) made moist with CLEANING AGENTS 
R  (Material No. 11-004) 
R  (2) Make sure that the parts retained from the removed component are 
R  clean and in the correct condition. 
R  (3) Do an inspection of the component interface and/or the adjacent area. 
R  (4) Lubricate the new O-rings that follow with FUELS (Material No. 01-
R  001) or COMMON GREASE (Material No. 04-012) : 
R  - FOR 23QA, 27QA 
R  the new O-ring (1) and the new O-ring (4) 
R  - FOR 24QA, 28QA 
R  the new O-ring (1) and the new O-ring (4) 
R  **ON A/C ALL
 Subtask 28-21-15-420-050
 B. Installation of the Fuel-Pump Pressure-Switch
 (1) Remove the blanking caps from the sealing valve and the pressure
 switch (2).
 (2) Install the O-ring (1) in the pressure switch (2) and the O-ring (4)
 around the plug (3).

 (3)
 Install the pressure switch (2) on the sealing valve and install the plug (3).

 (4)
 Safety the plug (3) to the sealing valve with MISCELLANEOUS (Material No. 19-010).

 (5)
 Remove the blanking caps and connect the electrical connector (5) to the pressure switch (2).

 Subtask 28-21-15-860-051
 C. Aircraft Configuration
 (1) Make sure that the applicable fuel tank contains a minimum 750 kg (1650 lb). Refuel if applicable (Ref. TASK 12-11-28-650-003).
 Subtask 28-21-15-865-063
 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -
FOR 23QA
 1QA, 11QA

 -
FOR 27QA
 7QA

 -
FOR 24QA
 2QA, 12QA

 -
FOR 28QA
 8QA

 -
FOR 39QA
 29QA

 -
FOR 40QA
 30QA.

 Subtask 28-21-15-790-050
 E. Test
 (1)
 Push (in) the applicable TK PUMP P/BSW.

 (2)
 Make sure that the applicable TK PUMP P/BSW OFF light goes off and that the FAULT comes on momentarily.

 (3)
 Examine the applicable fuel-pump pressure switch (2) for leaks.

 1EFF : ALL 1 28-21-15Page 415 1 1 May 01/04 1 1 1CES 1

 5. Close-up
________
 Subtask 28-21-15-860-052

 A. Aircraft Configuration
 (1)
 De-energize the aircraft electrical circuits and disconnect the electrical ground power unit (Ref. TASK 24-41-00-862-002).

 (2)
 Make sure that the work area is clean and clear of tool(s) and other items.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-21-15-410-051
 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Remove the access platform(s).

 (3)
 Close the applicable main-gear door (Ref. TASK 32-12-00-410-001):

 -
FOR 39QA
　
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