(2)
 Lower the nuts (4).

 (3)
 Pull the pack controller (1) on its rack (3) to disconnect the electrical connectors (2).

 (4)
 Remove the pack controller (1) from its rack (3).

 (5)
 Put blanking caps on the disconnected electrical connectors.

 Pack Controller
 Figure 401/TASK 21-61-34-991-003

 TASK 21-61-34-400-003
 Installation of the Pack Controller (7HH, 27HH)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  1 ACCESS PLATFORM 1M (3 FT)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-61-00-710-001  Operational Test of the Pack Temperature-Control System 24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 21-61-34-991-003 Fig. 401
 3. Job Set-up
__________ Subtask 21-61-34-860-052
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized
 (Ref. TASK 24-42-00-861-001).

 Subtask 21-61-34-865-057
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 7HH
 122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC 1HH X22 122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC 3HH X21 122VU 4HH Y19 122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC 2HH Y18
 FOR 27HH 122VU AIR COND/PACK TEMP/CTL SYS1/2/115VAC 21HH W22 122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 23HH W21 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 24HH Y21 122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC 22HH Y20
 Subtask 21-61-34-010-055
 C. Get Access
 (1)
 Make sure that the ACCESS PLATFORM 1M (3 FT) is in position at the access door 811.

 (2)
 Make sure that the access door 811 is open.

 4. Procedure
_________ (Ref. Fig. 401/TASK 21-61-34-991-003) Subtask 21-61-34-420-052
 A. Installation of the Pack Controller
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Remove the blanking caps from the electrical connectors.

 (4)
 Make sure that the electrical connectors are clean and in the correct condition.

 (5)
 Install the pack controller (1) in its rack (3).

 (6)
 Push the pack controller (1) on its rack (3) to connect the electrical connectors (2).

 (7) Engage the nuts (4) on the lugs (5) and tighten. Subtask 21-61-34-865-058
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 7HH 1HH, 2HH, 3HH, 4HH FOR 27HH 21HH, 22HH, 23HH, 24HH
 Subtask 21-61-34-710-052
 C. Do an operational test of the pack temperature-control system (Ref. TASK 21-61-00-710-001).
 5. Close-up
________ Subtask 21-61-34-410-052
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 811.

 (3) Remove the access platform(s). Subtask 21-61-34-862-052
 B. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 VALVE - ANTI ICE (17HH,37HH) - REMOVAL/INSTALLATION
___________________________________________________
 TASK 21-61-41-000-001
 Removal of the Anti-Ice Valve 17HH (37HH)
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______
 FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
 HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

 NOTE : The procedure is the same for both the anti-ice valves 17HH and 37HH.
　
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