____
 installation of the main heat exchanger.

 NOTE : It is no longer required that the bonding strap (11) be fitted on
____
 installation of the main heat exchanger.

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

 (2)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (3)
 Clean the component interface and/or the adjacent area.

 (4)
 Put the main heat exchanger (5) in position on the primary heat exchanger (1) and install the washers (3) and the screws (4).

 (5)
 TORQUE the screws (4) to between 0.35 and 0.45 m.daN (30.97 and 39.82 lbf.in).

 (6)
 Install the heat exchanger unit (Ref. TASK 21-52-24-400-001).

 1EFF : ALL 1 21-52-26Page 409 1 1 Aug 01/05R 1 1 1CES 1

 (7) Install the ram air outlet (Ref. TASK 21-61-52-400-003).
 (8) Install the pipe assembly (Ref. TASK 21-52-23-400-001). 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 Subtask 21-52-26-865-052
 C. Close Circuit Breakers
 (1) Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 
R  (a) FOR 10HM7 - 1HH, 2HH, 3HH, 4HH, 
R  (b) FOR 11HM7 - 21HH, 22HH, 23HH, 24HH. 
R  **ON A/C 401-499,
 Subtask 21-52-26-865-052-A
 C. Close Circuit Breakers
 (1) Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 
R  (a) FOR 10HM7 - 49HH, 50HH, 51HH, 52HH, 
R  (b) FOR 11HM7 - 53HH, 54HH, 55HH, 56HH.

 **ON A/C ALL
 Subtask 21-52-26-710-050
 D. Test
 (1)
 Do the pre-conditioning through the HP ground connector or with the APU (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).

 (2)
 Do a leak check of the main heat exchanger connections. NOTE : Minimum leakage is permitted. After the pack operates some

____ minutes, the leakage of air will reduce because the seals have their correct operating temperature.

 (3)
 After approx. 15 minutes stop the pre-conditioning (Ref. TASK 12-33-21-618-001) or (Ref. TASK 12-33-21-618-001).

 5. Close-up
________ Subtask 21-52-26-410-050
 A. Close Access
 (1) Install the access panel/s (Ref. TASK 53-35-13-400-002).
 (a)
 FOR 10HM7

 -191KB,

 (b)
 FOR 11HM7

 -192KB. Subtask 21-52-26-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
 1EFF : ALL 1 21-52-26Page 411 1 1 Aug 01/05R 1 1 1CES 1

 REHEATER (10HM3,11HM3) - REMOVAL/INSTALLATION
_____________________________________________
 TASK 21-52-31-000-001
 Removal of the Reheater 10HM3 (11HM3)
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______
 FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
 HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

 NOTE : The procedure for the reheater 10HM3 and the reheater 11HM3 is the same.
____
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-52-16-000-001 Removal of the Water Extractor 10HM8 (11HM8)
 21-52-23-000-003 Removal of the Pipe Assembly between the Anti-Ice R Valve (if installed) and the Bypass Air Duct of the R Primary Heat Exchanger
 21-52-31-200-001 Attachment Components (In-Service Wear Limits) -Reheater 10HM3 (11HM3) 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
 21-52-31-991-001 Fig. 401
 21-52-31-991-002 Fig. 402

 3. Job Set-up__________ Subtask 21-52-31-861-051
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-52-31-865-050
　
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