(2)
 Put the safety barriers in position.

 1EFF : ALL 1 28-21-00Page 548 1 1 Aug 01/05 1 1 1CES 1 Subtask 28-21-00-010-051

 B. Get Access
 (1)
 Put the access platform below the applicable access panels.

 (2)
 Remove the applicable access panels:

 -
for the left wing, remove 522AB, 413AL, 413CL, 413EL, 414AZ, 414FR, 437AL, 471AL, 472AR

 -
for the right wing, remove 622AB, 423AL, 423AZ, 423CL, 423FL, 424ER, 447AL, 481AL, 482AR.

 Subtask 28-21-00-860-079
 C. Aircraft Maintenance Configuration WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED
_______ BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
 (1)
 On the panel 115VU, make sure that the ENG/MASTER 1 and the ENG/MASTER 2 switches are in the OFF position.

 (2)
 Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 (3)
 Do the EIS start procedure (ECAM only) (Ref. TASK 31-60-00-860-001), then:

 - on the ECAM control panel (CP), push (in) the FUEL pushbutton switch (P/BSW)
 -make sure that the engine LP valves are shown closed (amber cross-line) on the ECAM lower display unit (DU).
 (4)
 Make sure each wing fuel tank contains a minimum of 1000 kg (2204.6220 lb) of fuel. Refuel if necessary (Ref. TASK 12-11-28-650-003).

 (5)
 On the panel 115VU, put the ENG/MASTER 1 and the ENG/MASTER 2 switches in the ON position.

 (6)
 On the ECAM lower DU:

 -make sure that the engine LP valves are open (green in-line).
 1EFF : ALL 1 28-21-00Page 549 1 1 May 01/04R 1 1 1CES 1

 Subtask 28-21-00-865-058
 D. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU FUEL/LP VALVE/MOT1/ENG2 2QG A09 49VU FUEL/LP VALVE/MOT1/ENG1 1QG A08 121VU FUEL/LP VALVE/MOT2/ENG2 4QG M26 121VU FUEL/LP VALVE/MOT2/ENG1 3QG M25
 Subtask 28-21-00-860-080
 E. Aircraft Maintenance Configuration (continued) R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 501/TASK 28-21-00-991-001)
 **ON A/C 301-399,

 (Ref. Fig. 501A/TASK 28-21-00-991-001-A)
 **ON A/C ALL

 (Ref. Fig. 502/TASK 28-21-00-991-002)
 (1)
 On the panel 115VU:

 -put the ENG/MASTER 1 and ENG/MASTER 2 switches in the OFF position.

 (2)
 On the panel 40VU:

 -push (in) the L TK PUMPS 1 and 2 and the R TK PUMPS 1 and 2 P/BSW
 -make sure that the OFF lights go off. NOTE : The FAULT lights come on momentarily.
____
 1EFF : ALL 1 28-21-00Page 550 1 1 Aug 01/05 1 1 1CES 1

 Panel Location
 Figure 501/TASK 28-21-00-991-001

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 551 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1

R  Panel Location 
R  Figure 501A/TASK 28-21-00-991-001-A 
R 1EFF :  301-399,  1  28-21-00 Page 552 
1  1  May 01/04
 1  1
 1CES  1

 Fuel Pump System Figure 502/TASK 28-21-00-991-002
 1EFF : 1 1R 1CES  ALL  1 11 1 28-21-00 Page 553 May 01/04

 4. Procedure
_________
 Subtask 28-21-00-790-053

 A. Leak Test
 (1) Examine the main fuel-feed pipeline from the LP valve to the HP valve for leaks.
 5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 501/TASK 28-21-00-991-001)
 **ON A/C 301-399,

 (Ref. Fig. 501A/TASK 28-21-00-991-001-A)
 **ON A/C ALL

 Subtask 28-21-00-860-078
 A. Aircraft Maintenance Configuration
 (1) On the panel 40VU:
 -release (out) the L TK PUMPS 1 and 2 and R TK PUMPS 1 and 2 P/BSW
 -make sure the OFF lights come on.
 Subtask 28-21-00-865-057

 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1QG, 2QG, 3QG, 4QG.
 Subtask 28-21-00-860-083
 C. Aircraft Maintenance Configuration
 (1)
 On the ECAM DU make sure that the LP valves are closed.

 (2)
 Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).

 1EFF : ALL 1 28-21-00Page 554 1 1 Aug 01/05 1 1 1CES 1

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