(b)
 Open the AFT cargo-compartment door (Ref. TASK 52-30-00-860-001).

R 1EFF : 001-049, 051-061, 101-103, 201-210, 1 30-71-51Page 405 1 1 Aug 01/05 1 1 1CES 1

 (c)
 Set the CARGO COMP LIGHT switch 8LU to ON.

 (d)
 Remove the partition 162DW to get access to the DRAINMAST-AFT (14DU).

 (4) FOR 24DU
 (a)
 Open the AFT cargo-compartment door (Ref. TASK 52-30-00-860-001).

 (b)
 Set the CARGO COMP LIGHT switch 8LU to ON.

 (c)
 Remove the floor panel 151UF to get access to the DRAINMAST-MID (24DU) (Ref. TASK 53-42-14-000-001).

R **ON A/C 062-099, 104-149, 151-199, 211-299, 401-499,
 Subtask 30-71-51-010-050-A
 C. Get Access R (1) FOR 4DU, 14DU
 (a)
 Release the pressure of the potable water system (Ref. TASK 38-10-00-614-002).

 (b)
 Operate the wash basin faucet to remove any remaining water still in the potable water lines.

 (c)
 Ensure the wash basin plug is fitted in the wash basin drain hole, to prevent any remaining water still in the potable water lines draining down to the drain mast.

 (d)
 Operate the galley faucets to remove any remaining water still in the potable water lines.

R (2) FOR 4DU
 (a)
 Open the FWD cargo-compartment door (Ref. TASK 52-30-00-860-001).

 (b)
 Set the CARGO COMP LIGHT switch 6LU to ON.

 (c)
 Remove the floor panel 131SF to get access to the DRAINMAST-FWD (4DU) (Ref. TASK 53-22-14-000-001).

R 1EFF : 051-051, 062-099, 104-149, 151-199, 1 30-71-51Page 406 1211-299, 401-499, 1Aug 01/05 1 1 1CES 1R (3) FOR 14DU

 (a)
 Put an access platform in position at the DRAINMAST-AFT (14DU).

 (b)
 Open the AFT cargo-compartment door (Ref. TASK 52-30-00-860-001).

 (c)
 Set the CARGO COMP LIGHT switch 8LU to ON.

 (d)
 Remove the partition 162DW to get access to the DRAINMAST-AFT (14DU).

 **ON A/C 301-399,
 Subtask 30-71-51-010-050-B
 C. Get Access
 (1)
 FOR 4DU, 14DU

 (a)
 Release the pressure of the potable water system (Ref. TASK 38-10-00-614-002).

 (b)
 Operate the wash basin faucet to remove any remaining water still in the potable water lines.

 (c)
 Ensure the wash basin plug is fitted in the wash basin drain hole, to prevent any remaining water still in the potable water lines draining down to the drain mast.

 (d)
 Operate the galley faucets to remove any remaining water still in the potable water lines.

 (2)
 FOR 4DU

 (a)
 Open the FWD cargo-compartment door (Ref. TASK 52-30-00-860-001).

 (b)
 Set the CARGO COMP LIGHT switch 6LU to ON.

 (c)
 Remove the floor panel 131TF to get access to the DRAINMAST-FWD (4DU) (Ref. TASK 53-22-14-000-001).

 (3)
 FOR 14DU

 (a)
 Put an access platform in position at the DRAINMAST-AFT (14DU).

 (b)
 Open the AFT cargo-compartment door (Ref. TASK 52-30-00-860-001).

R 1EFF : 062-099, 104-149, 151-199, 211-299, 1 30-71-51Page 407 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 (c)
 Set the CARGO COMP LIGHT switch 8LU to ON.

 (d)
 Remove the partition 162DW to get access to the DRAINMAST-AFT (14DU).

 **ON A/C ALL
 4. Procedure
_________
 **ON A/C 001-049, 052-061, 101-103, 201-203,

 (Ref. Fig. 401/TASK 30-71-51-991-001)
 **ON A/C 051-051,

 (Ref. Fig. 401A/TASK 30-71-51-991-001-B) R **ON A/C 062-099, 104-149, 151-199, 204-299, 301-399, 401-499,
 (Ref. Fig. 401B/TASK 30-71-51-991-001-A)
 **ON A/C 001-049, 051-061, 101-103, 201-203,

 Subtask 30-71-51-020-050
 A. Removal of the Drain Mast
 (1)
 Remove and discard the cable ties from the electrical wires.

 (2)
 Disconnect the electrical connector (6) of the drain mast (1).

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove the insulation from the pipe end (3).

 (5)
 Loosen the clamps (4) and remove the sleeve (5) from the pipe end of the drain mast.

 (6)
 Put a blanking plug on the disconnected pipe end (3) in the aircraft.

 (7)
 Remove the screws (2).

 Drain Mast 4DU/14DU
　
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