R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 21-52-21-991-001  Fig. 401
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION ------------------------------------------------------------------------------- 
R  **ON A/C 151-199, 401-499,  
R R 21-52-21-991-001-A  Fig. 401A  
**ON A/C ALL 
 21-52-21-991-002 3. Job Set-up__________ Subtask 21-52-21-861-052 Fig. 402 
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-21-865-050 
 B. Open, safety and tag this(these) circuit breaker(s): 
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 10HM1  
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  122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC  4HH  Y19
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,  
R  122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC  2HH  Y18  
R  **ON A/C 106-149, 303-399,  
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 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC  49HH 51HH 50HH  X22 X21Y18 
 **ON A/C ALL 
 FOR 11HM1  
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 21-52-21-941-050
 C. Safety Precautions
 (1)
 On the panel 30VU:
 (a)
 Make sure that:
 -
the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
 -
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
 (b)
 Put a warning notice in position to tell persons not to operate these pushbutton switches.
 (2)
 On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
 Subtask 21-52-21-010-050
 D. Get Access
 (1)
 Remove the access panel (Ref. TASK 53-35-13-000-002). FOR 10HM1 191KB, FOR 11HM1 192KB.
 (2)
 Remove the pipe assembly (Ref. TASK 21-52-23-000-001).
 (3)
 Remove the bypass valve 10HH (11HH) (Ref. TASK 21-61-53-000-001).
 4. Procedure
_________
 Subtask 21-52-21-020-051
 A. Removal of the Air Cycle Machine R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 401/TASK 21-52-21-991-001)
 Air Cycle Machine 10HM1 (11HM1).
 Figure 401/TASK 21-52-21-991-001
R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 21-52-21Page 405 1301-399, 1Aug 01/05 1 1 1CES 1
R **ON A/C 151-199, 401-499,
R (Ref. Fig. 401A/TASK 21-52-21-991-001-A) R
 **ON A/C ALL
 
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