Check Valve of the Fuel Pump Canister - Location and Detail
 Figure 403/TASK 28-21-52-991-004

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-52Page 456 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1

 Check Valve of the Fuel Pump Canister - Location and Detail Figure 403A/TASK 28-21-52-991-004-A
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 Subtask 28-21-52-941-064
 A. Safety Precautions
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.

_______
 (1)
 You must obey the fuel safety precautions (Ref. TASK 28-00-00-910-001) when you do work on the fuel system.

 (2)
 Put the safety barriers in position.

 (3)
 Put warning notices in position to tell persons not to operate the fuel system.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-21-52-860-056
 B. Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

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

 (a) Defuel (Ref. TASK 28-25-00-650-001) or transfer (Ref. TASK 28-25-00-869-001) the fuel from the applicable wing tank.

 (3)
 For removal of the center-tank fuel pump canister 84QM check valve:

 (a) Defuel (Ref. TASK 28-25-00-650-001) or transfer (Ref. TASK 28-25-00-869-001) the fuel from the LH wing tank.

 (4)
 For removal of the center-tank fuel pump canister 85QM check valve:

 (a) Defuel (Ref. TASK 28-25-00-650-001) or transfer (Ref. TASK 28-25-00-869-001) the fuel from the RH wing tank.

 (5)
 Energize the ECAM system (Ref. TASK 31-60-00-860-001).

 (6)
 On the ECAM Control Panel:

 -push (in) the FUEL system page button.
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 (7)
 On the panel 40VU:

 -release (out) the X FEED P/BSW. Make sure that the ON and OPEN lights go off.

 (8)
 On the ECAM SDU, make sure that the crossfeed valve indication shows green cross-line (closed).

 (9)
 On the ECAM SDU, turn the LOWER DISPLAY switch counter-clockwise to the off position. Make sure that the ECAM SDU goes off.

 (10) De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

 **ON A/C 301-399,
 Subtask 28-21-52-860-056-A
 B. Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 Defuel (Ref. TASK 28-25-00-650-001) or transfer (Ref. TASK 28-25-00-869-001) the fuel from the applicable wing tank.

 (3)
 Energize the ECAM system (Ref. TASK 31-60-00-860-001).

 (4)
 On the ECAM Control Panel:

 -push (in) the FUEL system page button.

 (5)
 On the panel 40VU:

 -release (out) the X FEED P/BSW. Make sure that the ON and OPEN lights go off.

 (6)
 On the ECAM SDU, make sure that the crossfeed valve indication shows green cross-line (closed).

 (7)
 On the ECAM SDU, turn the LOWER DISPLAY switch counter-clockwise to the off position. Make sure that the ECAM SDU goes off.

 (8)
 De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

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 **ON A/C ALL
 Subtask 28-21-52-865-058
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
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

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-21-52-010-056
 D. Get Access
 (1)
 Put an adjustable access platform in position below the applicable fuel pump.

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

 (a) Remove the applicable fuel pump (Ref. TASK 28-21-51-000-001).
　
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