-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 50HH Y18
**ON A/C ALL
FOR 28HH
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 21-61-51-941-054
C. 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 in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
4. Procedure
_________ (Ref. Fig. 601/TASK 21-61-51-991-009) Subtask 21-61-51-220-050
A. Measurement of the Air-Inlet Flap Backlash and Air-Inlet Flap Gap
(1) At the centre line of the air inlet flap (1) and the diffuser nose (2):
(a)
Measure and note the dimension "A".
(b)
Measure and note the dimension "B". NOTE : The measurement for the dimension "B" must be made with
____ the load applied (hand pressure). Do not apply excessive hand pressure as this could result in a false measurement.
(2)
Subtract dimension "A" from dimension "B". This will give you the backlash which exists in the air-inlet flap system.
(3)
If the backlash is more than 3mm (0.118 in) you must do a check of the in-service wear limits of the air-inlet flap mechanism (Ref. TASK 21-61-51-000-003) and (Ref. TASK 21-61-51-200-003).
(a)
If necessary replace the affected parts (Ref. TASK 21-61-51-400-003) and (Ref. TASK 21-61-00-300-001).
(b)
Do a check of the air-inlet flap gap and adjust if necessary (Ref. TASK 21-61-51-820-001).
(4)
Make sure that the work area is clean and clear of tool(s) and other items.
5. Close-up
________ Subtask 21-61-51-865-063
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
(1)
FOR 8HH
-1HH, 2HH, 3HH, 4HH, 49HH, 50HH, 51HH, 52HH.
(2)
FOR 28HH
-21HH, 22HH, 23HH, 24HH, 53HH, 54HH, 55HH, 56HH.
1EFF : ALL 1 21-61-51Page 604 1 1 Aug 01/05R 1 1 1CES 1
Inspection Measurement Location Figure 601/TASK 21-61-51-991-009
1EFF : 1 1R 1CES ALL 1 11 1 21-61-51 Page 605 Aug 01/05
Subtask 21-61-51-410-055
B. Remove the warning notice(s). Subtask 21-61-51-862-054
C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
1EFF : ALL 1 21-61-51Page 606 1 1 Aug 01/05R 1 1 1CES 1
TASK 21-61-51-200-002 Inspection of the Air Inlet Flap Backlash 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 air inlet flap.
____
1. Reason for the Job
__________________
This procedure is optional. It is to assist in early detection of possible excessive wear in the ram-air inlet flap offset mechanism system.
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