(2)
 Open the MLG doors (Ref. TASK 32-12-00-010-001).

 (3)
 Make sure that the GROUND LOCK SLEEVE (460005835) is on the MLG door actuators.

 (4)
 Put an access platform in position below the access panels 147AZ, 148AZ.

 (5)
 Remove the access panels 147AZ, 148AZ (Ref. TASK 57-17-11-000-001).

 (6)
 Put an adjustable access platform below the applicable zones 521(621) and 522(622).

 (7)
 Remove the leading-edge access-panels as required, to get access to the front of the wing tanks.

 1EFF : ALL 1 28-11-00Page 550 1 1 May 01/05R 1 1 1CES 1

 Subtask 28-11-00-480-052
 F. Installation of Equipment
 (1) For the left wing only, install a blanking cap on the center-tank vent pipe.
 (2) Install the DUMMY DOOR-NACA VENT (98D57204000000) as follows: R (Ref. Fig. 503/TASK 28-11-00-991-005)
 (a)
 Remove the applicable bolts (10).

 (b)
 Put the DUMMY DOOR-NACA VENT (13) in position and attach it with the washers (11) and the bolts (12).

 (c)
 Connect the vacuum equipment capable of a negative pressure to

 4.00 p.s.i. (0.276 bar) to the DUMMY DOOR-NACA VENT (13).
 (d) Connect a manometer negative press range of 2.00 to 4.00 p.s.i.
 (0.138 to 0.276 bar) to the DUMMY DOOR-NACA VENT (13).
 4. Procedure
_________
 Subtask 28-11-00-790-068

 A. Leak Test
 (1)
 Mix the SPECIAL MATERIALS (Material No. 05-045), SPECIAL MATERIALS (Material No. 05-045A) or SPECIAL MATERIALS (Material No. 05-046B) (refer to the dye manufacturers instructions for the details).

 (2)
 Operation of the vacuum equipment CAUTION : THE NEGATIVE PRESSURE MUST NOT BE MORE THAN 2.9 PSI (0.20

_______
 BAR) FOR SAFETY.

 (a) Operate the vacuum equipment so that there is a maximum negative pressure of 2.9 p.s.i. (0.20 bar).
 (3) Use a soft brush or a syringe to apply the dye solution to the tank (external surface only).
 1EFF : ALL 1 28-11-00Page 551 1 1 May 01/04 1 1 1CES 1

R  NACA Vent Dummy Door Figure 503/TASK 28-11-00-991-005
 1EFF : 1 1 1CES  ALL  1 111 28-11-00 Page 552 May 01/04

 (4)
 Keep the area wet for a minimum of 30 minutes, as follows:

 -above the wing, make a dam with putty and fill the dam with the dye solution
 -below the wing, attach a plastic bag filled with the dye solution
 -vertical faces of the tank, use the putty or the plastic bag procedure.

 (5)
 After 1 hour let the negative pressure slowly go back to normal.

 (6)
 Remove the applicable fuel tank access panels (Ref. TASK 28-10-00-910-002) (Ref. TASK 57-27-11-000-001) (Ref. TASK 57-27-11-000-002).

 Subtask 28-11-00-790-059
 B. Visual Inspection
 (1)
 Make a visual inspection inside the tank and look for signs of the dye (refer to the dye manufacturers instructions for details).

 (2)
 If the dye has not gone into the tank, no more tests are necessary.

 (3)
 If the dye has gone into the tank, make a mark at the location of the leak.

 Subtask 28-11-00-160-050
 C. Cleaning after Test
 (1)
 Use CLEANING AGENTS (Material No. 11-004) and a clean MISCELLANEOUS (Material No. 19-003) to remove dye from the tank.

 (2)
 Make sure that all the dye is removed and that the tank is clean.

 5. Close-up
________ R (Ref. Fig. 503/TASK 28-11-00-991-005) Subtask 28-11-00-080-052
 A. Removal of Test Equipment
 (1)
 Remove the vacuum equipment from the DUMMY DOOR-NACA VENT (13).

 (2)
 Remove the manometer from the DUMMY DOOR-NACA VENT (13).

 (3)
 Remove the bolts (12) and the washers (11) from the DUMMY DOOR-NACA VENT (98D57204000000). Remove the DUMMY DOOR-NACA VENT.

 1EFF : ALL 1 28-11-00Page 553 1 1 May 01/04 1 1 1CES 1 Subtask 28-11-00-410-061

 B. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install and TORQUE the bolts (10) in opposite sequence:

 -
to between 25 and 30 lbf.in (0.28 and 0.33 m.daN) then

 -
to between 90 and 100 lbf.in (1.01 and 1.13 m.daN).

 (3)
 Install the fuel tank access panels that you removed (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-400-001), (Ref. TASK 57-27-11-400-001) and (Ref. TASK 57-27-11-400-002).
　
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