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 -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 21-52-23-000-001 Removal of the Pipe Assembly between the Main Heat R Exchanger and the Air Cycle Machine 21-52-24-000-001 Removal of the Heat Exchanger Unit 10HM4 (11HM4)
 (From the Aircraft) 21-61-52-000-003 Removal of the Ram-Air Outlet 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 21-52-26-991-001 Fig. 401

 3. Job Set-up__________ Subtask 21-52-26-861-051
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-26-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------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  49HH 51HH  X22 X21

 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 50HH Y18
 **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 21-52-26-010-050
 C. Get Access
 (1) Remove the access panel/s (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 21-52-26-020-050
 A. Removal of the Main Heat Exchanger
 (1)
 Remove the ram air outlet (Ref. TASK 21-61-52-000-003).

 (2)
 Remove the pipe assembly (Ref. TASK 21-52-23-000-001).

 (3)
 Remove the heat exchanger unit (Ref. TASK 21-52-24-000-001).

 (4)
 Remove the screws (4), the washers (3), (where fitted) the gasket (2) and the main heat exchanger (5).

 (5)
 Put protective covers on the cooling elements of the main heat exchanger (5) and the primary heat exchanger (1).

 (6)
 If installed: Remove the nut (9), the washer (10), the screw (12) and the bonding strap (11).

 1EFF : ALL 1 21-52-26Page 404 1 1 Aug 01/05R 1 1 1CES 1

 Main Heat Exchanger 10HM7 (11HM7) - Component Location
 Figure 401/TASK 21-52-26-991-001

 1EFF : ALL 1 21-52-26Page 405 1 1 Aug 01/05R 1 1 1CES 1

 TASK 21-52-26-400-001
 Installation of the Main Heat Exchanger 10HM7 (11HM7)
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
　
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