-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 21-28-00-991-004-A Fig. 402 R **ON A/C 151-199, 401-499,
 21-28-00-991-004 Fig. 402A
 **ON A/C ALL

 3. Job Set-up
__________
 Subtask 21-28-00-861-075-A

 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 Subtask 21-28-00-010-076-B
 B. Get Access
 (1)
 Open the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-001).

 (2)
 Put the access platform at the AFT cargo-compartment door 826.

 (3)
 Remove the access panel (Ref. TASK 25-55-12-000-001):

 (a) FOR 33HN
 -162DW.

 (4)
 Remove the access panel (Ref. TASK 25-55-11-000-003):

 (a) FOR 34HN
 -151EW.

 (2)
 Make sure that the electrical connectors are clean and in the correct condition.

 (3)
 Remove the temporary attachments and connect the electrical connectors (3), (33HN-A and 34HN-A).

 (4)
 Make sure that the work area is clean and clear of tool(s) and other items.

R  **ON A/C 151-199, 401-499,
 Subtask 21-28-00-010-076
 B. Get Access
R  (1) Open the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-001). (2) Put the access platform at the AFT cargo-compartment door 826. (3) Remove the access panel (Ref. TASK 25-55-12-000-001): (a) FOR 33HN - 162DW.
R  (4) Remove the access panel (Ref. TASK 25-55-11-000-003): (a) FOR 34HN - 151VW.
 **ON A/C ALL
 4. Procedure_________ Subtask 21-28-00-440-053-A
 A. Reactivation of the AFT cargo-Compartment Ventilation Isolation-Valves **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
R  (Ref. Fig. 402/TASK 21-28-00-991-004-A) **ON A/C 151-199, 401-499,
 (Ref. Fig. 402A/TASK 21-28-00-991-004) **ON A/C ALL
 (1) Remove the blanking plugs from the disconnected electrical connectors.

 Subtask 21-28-00-865-077
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/AFT CARGO VENT/FAN 30HN S22

R **ON A/C ALL
 Subtask 21-28-00-865-081
 C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION FIN LOCATION
 -------------------------------------------------------------------------------
122VU AIR COND/AFT CARGO VENT/CTL AND/MONG 31HN 20 S
 or alternative location :-
49VU AIR COND/AFT CARGO/VENT/CTL & MONG 31HN 07 C
 Subtask 21-28-00-810-056-A
 D. Do the trouble shooting of the cargo-compartment ventilation system (Ref. TSM ATA 21) and do the applicable corrective maintenance procedure(s).

 5. Close-up
________
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,

 Subtask 21-28-00-410-076-B
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel (Ref. TASK 25-55-12-400-001):

 (a) FOR 33HN
 -162DW.

 (3)
 Install the access panel (Ref. TASK 25-55-11-400-003):

 (a) FOR 34HN
 -151EW.

 (4)
 Remove the access platform(s).

 (5)
 Close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).

R **ON A/C 151-199, 401-499,
 Subtask 21-28-00-410-076
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2)
 Install the access panel (Ref. TASK 25-55-12-400-001): R (a) FOR 33HN

 -162DW.

 (3)
 Install the access panel (Ref. TASK 25-55-11-400-003): R (a) FOR 34HN

 -151VW.

 (4)
 Remove the access platform(s).

 (5)
 Close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).
　
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