-------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 401-499,
 49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC 52HH D08

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 21HH W22 122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 23HH W21 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 24HH Y21 122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC 22HH Y20

R **ON A/C 401-499,
 122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 49HH X22 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 51HH X21 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 50HH Y18
 **ON A/C ALL
 Subtask 21-52-25-010-050
 B. Get Access
 (1) Remove the access panel/s (Ref. TASK 53-35-13-000-002).
 (a)
 FOR 10HM6

 -191KB,

 (b)
 FOR 11HM6

 -192KB.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-52-25-991-001) Subtask 21-52-25-020-050
 A. Removal of the Primary 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 (2), the washers (3), the fan plenum (1) and (where fitted) the gasket (4).

 (5)
 Remove the screws (8), the washers (7) and the primary heat exchanger (5).

 (6)
 Remove (where fitted) the gasket (6).

 (7)
 Put protective covers on the cooling elements of the primary heat exchanger (5) and the main heat exchanger (9).

 1EFF : ALL 1 21-52-25Page 404 1 1 Aug 01/05R 1 1 1CES 1

 Primary Heat Exchanger 10HM6 (11HM6) - Component Location Figure 401/TASK 21-52-25-991-001
 1EFF : ALL 1 21-52-25Page 405 1 1 Aug 01/05R 1 1 1CES 1

 TASK 21-52-25-400-001
 Installation of the Primary Heat Exchanger 10HM6 (11HM6)
 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.

 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 21-52-25-991-001 Fig. 401

 3. Job Set-up__________
 Subtask 21-52-25-865-051
 A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 10HM6 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
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 
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, 
　
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