NOTE : The procedure is the same for the main heat exchanger 10HM7 and 11HM7.
____
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
R No specific Torque Wrench : range 0.00 to 1.20 m.daN
R (0.00 to 9.00 lbf.ft)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
12-33-21-618-001 Pre-conditioning through the HP Ground Connection 12-33-21-618-001 Pre-conditioning with the APU 21-52-23-400-001 Installation of the Pipe Assembly between the Main
 Heat Exchanger and the Air Cycle Machine 21-52-24-400-001 Installation of the Heat Exchanger Unit 10HM4 (11HM4)
 (Into the Aircraft) 21-61-52-400-003 Installation of the Ram-Air Outlet 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the External Power 53-35-13-000-002 Removal of the Quick-Release Access Panels from the Belly Fairing Structure 53-35-13-400-002 Installation of the Quick-Release Access Panels on the Belly Fairing Structure 21-52-26-991-001 Fig. 401

 3. Job Set-up__________ Subtask 21-52-26-865-051
 A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 10HM7 
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 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC  49HH 51HH 50HH  X22 X21Y18

 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------**ON A/C ALL
 FOR 11HM7 
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 21-52-26-860-050
 B. Aircraft Maintenance Configuration
 (1) Make sure that the access panel/s is/are removed (Ref. TASK 53-35-13-000-002),
 (a) FOR 10HM7 - 191KB,
 (b) FOR 11HM7 - 192KB.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-52-26-991-001) Subtask 21-52-26-560-050
 A. Preparation of the Replacement Component
 (1)
 Remove the screws (7), the air-conditioning pack identification-plate

 (6) and the air-conditioning pack amendment-plate (8) from the removed main heat exchanger (5).

 (2)
 Put the air-conditioning pack identification-plate (6) and the air-conditioning pack-amendment plate (8) in position on the replacment main heat exchanger (5).

 (3)
 Install the screws (7). NOTE : These steps are necessary as these plates carry the P/N etc.

____
 for the air conditioning pack.

 Subtask 21-52-26-420-050
 B. Installation of the Main Heat Exchanger.
 NOTE : It is no longer required that the gasket (2) be fitted on
　
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