(2)
 For the wing tank fuel pump canister check valves:

 (a) Make sure that the applicable wing tank has been defueled (Ref. TASK 28-25-00-650-001), or the fuel has been transferred (Ref. TASK 28-25-00-869-001).

 (3)
 Make sure that the applicable fuel pump has been removed (Ref. TASK 28-21-51-000-001).

 (4)
 For the center-tank fuel pump canister 84QM check valve:

 (a)
 Make sure that the LH wing tank has been defueled (Ref. TASK 28-25-00-650-001), or the fuel has been transferred (Ref. TASK 28-25-00-869-001).

 (b)
 Make sure that the access panel 195BB is open.

 1EFF : ALL 1 28-21-52Page 464 1 1 Aug 01/05 1 1 1CES 1

 (c) Make sure that the applicable fuel pump has been removed (Ref. TASK 28-21-51-000-002).
 (5) For the center-tank fuel pump canister 85QM check valve:
 (a)
 Make sure that the RH wing tank has been defueled (Ref. TASK 28-25-00-650-001), or the fuel has been transferred (Ref. TASK 28-25-00-869-001).

 (b)
 Make sure that the access panel 196BB is open.

 (c)
 Make sure that the applicable fuel pump has been removed (Ref. TASK 28-21-51-000-002).

 **ON A/C 301-399,
 Subtask 28-21-52-860-053-A
 B. Aircraft Maintenance Configuration
 (1)
 Make sure that the applicable wing tank has been defueled (Ref. TASK 28-25-00-650-001), or the fuel has been transferred (Ref. TASK 28-25-00-869-001).

 (2)
 Make sure that the adjustable access platform is in position below the applicable fuel pump.

 (3)
 Make sure that the applicable fuel pump has been removed (Ref. TASK 28-21-51-000-001).

 1EFF : ALL 1 28-21-52Page 465 1 1 May 01/05R 1 1 1CES 1

 **ON A/C ALL
 Subtask 28-21-52-865-059
 C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 121VU FUEL/CTR TK/PUMP2 SPLY 30QA P26
 121VU FUEL/CTR TK/PUMP1 SPLY 29QA P23
 **ON A/C ALL
 121VU FUEL/L WING TK/PUMP2 SPLY 7QA N26 121VU FUEL/L WING TK/PUMP1 SPLY 1QA N23 121VU FUEL/R WING TK/PUMP2 SPLY 8QA Q26 121VU FUEL/R WING TK/PUMP1 SPLY 2QA Q23 123VU L WING TK/PUMP 1/STBY SPLY 11QA AD12 123VU R WING TK/PUMP 1/STBY SPLY 12QA AE12
 4. Procedure
_________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 403/TASK 28-21-52-991-004)
 **ON A/C 301-399,
 (Ref. Fig. 403A/TASK 28-21-52-991-004-A)
 1EFF : ALL 1 28-21-52Page 466 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL

 Subtask 28-21-52-420-059
 A. Preparation for Installation
 (1)
 Clean the component interfaces and/or the adjacent areas with a MISCELLANEOUS (Material No. 19-003) made moist with CLEANING AGENTS (Material No. 11-026).

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (4)
 Lubricate the new O-ring (5) with COMMON GREASE (Material No. 04-004).

 Subtask 28-21-52-420-060
 B. Installation of the Check Valve of the Fuel Pump Canister
 (1)
 Install the new O-ring (5) on the check valve (4).

 (2)
 Put the check valve (4) in position in the canister (1).

 (3)
 Install the four washers (3) and the four screws (2).

 (4) TORQUE the screws (2) to 0.226 m.daN (19.99 lbf.in). R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-21-52-410-054
 C. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 For the check valve of the wing-tank fuel pump canisters:

 (a) Install the applicable fuel pump (Ref. TASK 28-21-51-400-001).

 (3)
 For the check valve of the center-tank fuel pump canisters:

 (a)
 Install the applicable fuel pump (Ref. TASK 28-21-51-400-002).

 (b)
 Close the applicable access panel 195BB, 196BB.

 1EFF : ALL 1 28-21-52Page 467 1 1 Aug 01/05 1 1 1CES 1 **ON A/C 301-399,
　
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