R  Subtask 21-61-41-865-057  
R  B. Open, safety and tag this(these) circuit breaker(s):  
R  ------------------------------------------------------------------------------- 
R  PANEL  DESIGNATION  IDENT. LOCATION  
R  ------------------------------------------------------------------------------- 
R  FOR 10HM  
R  122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC  1HH  X22  
R  122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC  3HH  X21  
R  **ON A/C 106-149, 303-399,  
R  122VU  4HH  Y19  
R  **ON A/C 106-149, 159-199, 211-299, 301-399,  
R  122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC  2HH  Y18  
R  **ON A/C 159-199, 211-299, 301-302,  
R  122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC  4HH  Y19  
R  **ON A/C 106-149, 159-199, 211-299, 301-399,  
R  FOR 11HM  
R  122VU AIR COND/PACK TEMP/CTL SYS1/2/115VAC  21HH  W22  
R  122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC  23HH  W21  
R  122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC  24HH  Y21  
R  122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC  22HH  Y20  
R  Subtask 21-61-41-010-052  
R  C. Get Access  
R  (1) Remove the access panel(s) (Ref. TASK 53-35-13-000-002)  
R  (a) For FIN 25HH  
R  - 191KB.  
R  (b) For FIN 40HH  
R  - 192KB.
R  4. Procedure_________  
R  (Ref. Fig. 403/TASK 21-61-41-991-003)  
R  Subtask 21-61-41-020-054  
R  A. Removal of the Back Up Solenoid  
R  (1) At the back up solenoid (5), disconnect the electrical connector (1).  
R  (2) Put blanking caps on the disconnected electrical connectors.  
R  (3) Disconnect the sense line connectors (2) and (3).  
R  (4) Remove the nut (7), the washer (6), the screw (4) and the back up  
R  solenoid (5).  
R  (5) Put blanking plugs on the disconnected line ends.
R Back Up Solenoid R Figure 403/TASK 21-61-41-991-003
 1EFF : 106-149, 159-199, 211-299, 301-399, 1 21-61-41Page 440 1 1 Aug 01/05 1 1 1CES 1
R  TASK 21-61-41-400-003  
R  Installation of the Back Up Solenoid  
R  WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM_______  
R  FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.  
R  HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.  
R  NOTE : The procedure is the same for the back up solenoids 25HH and 40HH.____  
R  1. Reason for the Job__________________  
R  Self Explanatory  
R  2. Job Set-up Information______________________  
R  A. Fixtures, Tools, Test and Support Equipment  
R  ------------------------------------------------------------------------------- 
R  REFERENCE  QTY DESIGNATION  
R  ------------------------------------------------------------------------------- 
R  No specific  Torque Wrench : range 0.00 to 1.20 m.daN  
R  (0.00 to 9.00 lbf.ft)  
R  B. Consumable Materials  
R  ------------------------------------------------------------------------------- 
R  REFERENCE  DESIGNATION  
R  ------------------------------------------------------------------------------- 
R  Material No. 04-014A  USA MIL-PRF-907  
R  HIGH TEMPERATURECOMPOUND (Ref. 20-31-00)
R C. Referenced Information 
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R 12-33-21-618-001 R 12-33-21-618-001 R 21-61-00-710-001 R R 24-41-00-861-002 R R 24-41-00-862-002 R R 53-35-13-000-002 R R 53-35-13-400-002 R R 21-61-41-991-003 
R 3. Job Set-up
__________ 
R Subtask 21-61-41-860-053 Pre-conditioning through the HP Ground Connection Pre-conditioning with the APU Operational Test of the Pack Temperature-Control System Energize the Aircraft Electrical Circuits from the External Power De-energize the Aircraft Electrical Circuits Supplied from the External Power Removal of the Quick-Release Access Panels from the Belly Fairing Structure Installation of the Quick-Release Access Panels on the Belly Fairing Structure Fig. 403 
 
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