______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 53-35-13-000-002 Removal of the Quick-Release Access Panels from the Belly Fairing Structure

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 21-52-23-991-002 Fig. 402 R **ON A/C 401-499,
R 21-52-23-991-002-B Fig. 402A

 **ON A/C ALL
 3. Job Set-up__________ Subtask 21-52-23-861-053
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-23-865-053
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 10HM12 
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  -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------**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 11HM12 
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 21-52-23-010-052
 C. Get Access
 (1) Remove the access panel (Ref. TASK 53-35-13-000-002). FOR 10HM12 191KB, FOR 11HM12 192KB. 

R 1EFF : ALL 1 21-52-23Page 427 1 1 Aug 01/05 1 1 1CES 1

 Subtask 21-52-23-941-051
 D. 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.
 4. Procedure_________ 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 402/TASK 21-52-23-991-002) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 402A/TASK 21-52-23-991-002-B) 
R  **ON A/C ALL
 Subtask 21-52-23-020-051
 A. Removal of the Pipe Assembly
 (1) Remove the clamps (5) and (9) and carefully remove the pipe assembly (8).
 (2) Remove and discard the packings (2) and (3) and the seal (4).
R  (3) Put blanking plugs on the disconnected line ends. 

R 1EFF : ALL 1 21-52-23Page 428 1 1 Aug 01/05 1 1 1CES 1

 Pipe Assembly.
 Figure 402/TASK 21-52-23-991-002

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R  Pipe Assembly. 
R  Figure 402A/TASK 21-52-23-991-002-B 
　
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