(2)
Check turbofan oil level and service if required. Refer to Chapter 12, Ram Air System Turbofan Servicing.
(3)
Provide electrical power.
(4)
Check that the following circuit breakers on circuit breaker panel P6 are closed:
(a)
L and R TURBOFAN
(b)
L and R RAM MOD
(c)
RAM MOD CONT
(d)
MASTER CAUTION (all except FUEL, if installed)
(e)
INDICATOR LTS, MASTER DIM BUS (nine places)
(f)
DIM & TEST (one place)
(5)
Connect air source to pneumatic system ground service connection.
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NOTE: The isolation valve must be opened to provide air to the left ram air system turbofan valve. Refer to Chapter 36, Engine Bleed Air Distribution System.
C. Test Air Cleaner System
(1)
Lower wing flaps to any position other than full up. Refer to Chapter 27, Trailing Edge Flap System.
(2)
Check that air conditioning PACK switch is OFF.
(3)
Check that turbofan valve is closed.
(4)
Pressurize pneumatic system.
(5)
Disconnect electrical connector which is located on the side of the pack valve visual indicator.
(6)
Check that turbofan valve opens and turbofan starts.
(7)
Place APU BLEED switch to ON. Check that purge valve goes to CLOSED as noted by the valve position indicator.
(8)
Place APU BLEED switch to OFF. Check that purge valve goes to OPEN as noted by valve position indicator.
(9)
Connect electrical connector disconnected in step (5) to pack valve. Check that turbofan valve closes and turbofan stops.
D. Restore Airplane to Normal Configuration
(1)
Remove air source and close air conditioning equipment bay doors.
(2)
If no longer required, remove electrical power from airplane.
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ENGINE BLEED AIR CLEANER - REMOVAL/INSTALLATION
1. General
A. The engine bleed air cleaners are located in the pneumatic manifold outboard of the air conditioning duct for the respective engine. When removing or installing the air cleaner exercise care not to dent or damage beads on duct flanges as leaks may develop at joint.
B. The removal/installation procedures for the air cleaners are similar. The tubing to be removed to provide clearance for removal of the air cleaner are slightly different. Any difference in procedure is noted in the step involved (Fig. 401).
2. Remove Air Cleaner
A. Open air conditioning equipment bay doors.
B. Remove hydraulic pressure from thrust reverser system (Ref Chapter 29, Hydraulic Power, and Chapter 78, Thrust Reverser - MP).
C. Remove hydraulic lines aft of air cleaner.
D. For left side air cleaner removal, remove air pressure supply line at the fittings and remove line.
E. For right side air cleaner removal, remove air conditioning pressure sensing line at fittings and remove line.
F. Disconnect purge air duct from cleaner.
G. Remove V-band clamp from each end of cleaner.
H. Remove cleaner.
3. Install Air Cleaner
A. Position air cleaner between duct flanges with large end downstream and rotate to align boss to purge bleed line.
B. Install two V-band clamps. Do not tighten clamps completely.
C. Connect purge air duct to boss on cleaner. Do not tighten clamp completely.
D. For left side air cleaner installation, connect air pressure supply line.
E. For right side air cleaner installation, connect air conditioning pressure sensing line.
F. Connect lines to ports on thrust reverser isolation valve (Ref Chapter 29, Hydraulic Tubing and Flexible Hoses – MP).
G. Check orientation of V-band clamps on each end of air cleaner and clamp connecting purge air duct to air cleaner to verify that they do not interfere with thrust reverser isolation valve hydraulic lines.
H. Tighten clamps.
I. Cycle thrust reverser several times to remove any air bubbles in hydraulic system.
J. Functionally test system and check for air leaks at joints during test (Ref Air cleaner System – A/T).
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