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R Attachment Components - Air Duct
R Figure 403/TASK 21-51-51-991-006-B33 (SHEET 3)
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INTENTIONALLY BLANK
R 1 1
21-51-51Page 439
1 1 May 01/05 1 1 1CES 1
Attachment Components - Air Duct
Figure 403A/TASK 21-51-51-991-006- 13 (SHEET 1)
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Attachment Components - Air Duct
Figure 403A/TASK 21-51-51-991-006- 23 (SHEET 2)
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Attachment Components - Air Duct
Figure 403A/TASK 21-51-51-991-006- 33 (SHEET 3)
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Subtask 21-51-51-865-057
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 11HB 1HH, 2HH, 3HH, 4HH, 1HB. FOR 8HB 21HH, 22HH, 23HH, 24HH, 2HB.
Subtask 21-51-51-710-050
F. Test
(1)
Do the pre-conditioning through the HP ground connector (Ref. TASK 12-33-21-618-001) or with the APU (Ref. TASK 12-33-21-618-001).
(2)
Do a leak check of the pack flow-control valve. 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)
Do a leak check of the sense line connections.
NOTE : Leaks are not permitted.
____
(4)
After approx. 15 minutes stop the pre-conditioning (Ref. TASK 12-33-21-618-001) or (Ref. TASK 12-33-21-618-001).
(5)
Do the operational test of the flow control and indicating system (Ref. TASK 21-51-00-710-002).
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5. Close-up
________
Subtask 21-51-51-410-053
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Install the access panels (Ref. TASK 53-35-13-400-002): R (a) FOR 11HB 191KB and 191BB. R (b) FOR 8HB
192KB and 191BB.
Subtask 21-51-51-862-050
B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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TASK 21-51-51-000-001-A
Removal of the Pack Flow-Control Unit
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 circuit breaker(s) safety clip(s)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
21-51-51-000-002 Removal of the Air Duct upstream of the Flow Control Unit 21-51-51-200-001 Attachment Components (In-Service Wear Limits) - Flow Control Valve (Unit) 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 21-51-51-991-003 Fig. 402
R **ON A/C 401-499,
21-51-51-991-009 Fig. 404
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R **ON A/C 106-149, 303-399, 401-499,
3. Job Set-up__________
Subtask 21-51-51-861-054
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
Subtask 21-51-51-865-063
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 23HB
R **ON A/C 401-499,
R 49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC 52HH 49HH 51HH 50HH D08 X22X21Y18
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