________________________________________________________
 TASK 21-61-52-200-001
 Detailed Inspection of the Ram Air Outlet Flap and Check for Excessive Backlash of Outlet Flap
 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 is the same for the left and the right ram air outlet.
____
 1. Reason for the Job
__________________
 Refer to the MPD TASK: 215000-04
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-61-52-000-002 Removal of the Ram-Air Outlet Flap 21-61-52-000-003 Removal of the Ram-Air Outlet 21-61-52-400-002 Installation of the Ram-Air Outlet Flap 21-61-52-400-003 Installation of the Ram-Air Outlet 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power 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 21-61-52-991-012 Fig. 601
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 3. Job Set-up
__________
 Subtask 21-61-52-861-053
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002)
 Subtask 21-61-52-865-063
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 9HH
 122VU AIR COND/PACK TEMP/CTL SYS1/1/115VAC 1HH X22 122VU AIR COND/PACK TEMP/CTL SYS1/1/28VDC 3HH X21 122VU AIR COND/PACK TEMP CTL SYS2/1/28VDC 4HH Y19 122VU AIR COND/PACK TEMP CTL SYS2/1/115VAC 2HH Y18
 FOR 29HH 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
 Subtask 21-61-52-010-056
 C. Get Access
 (1) Remove the access panel/s (Ref. TASK 53-35-13-000-002).
R (a) FOR 9HH
 -191KB
R (b) FOR 29HH
 -192KB
 Subtask 21-61-52-941-052
 D. Safety Precautions
 (1) On the panel 30VU:
 (a)
 Make sure that the APU BLEED and the ENG BLEED/1(2) pushbutton switches are released.

 (b)
 Put a warning notice to tell persons not to operate these pushbutton switches.

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 (2) On the HP ground connector put a warning notice to tell persons not to supply the ground air.
 4. Procedure
_________ Subtask 21-61-52-220-050
 A. Inspection of the Ram Air Outlet Flap Backlash
 (1) At the centre line of the ram-air outlet flap (1) measure and make a note of the dimension "B".
 NOTE : This measurement must be made with no load applied.
____
 (2) At the centre line of the ram-air outlet flap (1) measure and make a note of the dimension "A".
 NOTE : This measurement must be made with the load applied (hand
____ pressure). Do not apply excessive pressure as this could result in a false measurement.
 (3)
 Take the dimension "A" away from the dimension "B". The result will indicate the amount of backlash in the ram-air outlet flap-system.

 (4)
 If the backlash is more than 20 mm (0.7874 in.) then you must replace the ram air outlet (Ref. TASK 21-61-52-000-003) and (Ref. TASK 21-61-52-400-003).

 Subtask 21-61-52-220-059
 B. Detailed Inspection of the Ram Air Outlet Flap
 (Ref. Fig. 601/TASK 21-61-52-991-012)

 (1)
 Disconnect the electrical connector (2).

 (2)
 Put blanking caps on the disconnected electrical connectors.

 (3)
 Hold the air outlet flap (1) and the actuator (3) and remove the nut (7), the bolt (4) and the bush (5).
　
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