AIR COOLING SYSTEM - SERVICING
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 TASK 21-52-00-960-001
 Replacement of the Water Injector Nozzle
 1. Reason for the Job
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 Self Explanatory
 2. Job Set-up Information
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 A. Fixtures, Tools, Test and Support Equipment
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REFERENCE  QTY DESIGNATION
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No specific  circuit breaker(s) safety clip(s) 
R No specific  Torque Wrench : range 0.00 to 1.20 m.daN 
R  (0.00 to 9.00 lbf.ft)
 B. Consumable Materials
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REFERENCE  DESIGNATION
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Material No. 08-063  USA MIL-T-27730 SIZE 2
 TAPE,ANTISEIZE, POLYTETRAFLUORO- ETHYLENE
 (Ref. 20-31-00)
 C. Referenced Information
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REFERENCE  DESIGNATION
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21-52-42-000-001 Removal of the Water Injector 20HM (21HM) 21-52-42-400-001 Installation of the Water Injector 20HM (21HM) 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 21-52-00-991-019 Fig. 301
 3. Job Set-up__________ Subtask 21-52-00-861-062 
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-00-865-075 
 B. Open, safety and tag this(these) circuit breaker(s): 
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 20HM  
R  **ON A/C 401-499, 
R  49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399, 52HH  D08  
R  122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC 122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC  1HH 3HH  X22X21  
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,  
R R  122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,  4HH  Y19  
R R  122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC **ON A/C 106-149, 303-399,  2HH  Y18  
R  122VU  4HH  Y19  
R  **ON A/C 401-499,  
R R  122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC  49HH 51HH  X22 X21
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PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 50HH Y18 
 **ON A/C ALL 
 FOR 21HM  
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399, 
 122VU AIR COND/PACK TEMP/CTL SYS1/2/115VAC 122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC  21HH 23HH 24HH 22HH  W22W21Y21Y20  
R  **ON A/C 401-499, 
R R  122VU AIR COND/TEMP CTL SYS 2/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 2/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC  53HH 55HH 56HH 54HH  W22W21 Y21Y20  
**ON A/C ALL 
 Subtask 21-52-00-010-071 
 C. Get Access 
 (1) Remove the water injector (Ref. TASK 21-52-42-000-001). 
 4. Procedure_________ 
 
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