(e)
Insert ram air inlet plug into inlet, aft of the step off to the duct, and expand rubber periphery of plug by tightening the two adjusting screws.
(f)
Check that all duct tie bolts are connected.
(g)
Connect air source to ram air inlet plug.
(3)
Test Ram Air System Leakage
(a)
Apply pressure of 2.5 psi. Check that leakage rate does not exceed 15 pounds per minute.
(b)
Check that there are no concentrated leaks at any duct joints.
NOTE: A concentrated leak is defined as a leak which can be felt by hand 12 inches from joint.
(c)
Reduce pressure to 0.5 psi. Check that leakage rate does not exceed 5 pounds per minute.
(4)
Restore Airplane to Normal Configuration
(a)
Disconnect air source from ram air inlet plug.
(b)
Remove ram air inlet plug.
(c)
Remove duct plug from exhaust louver frame.
(d)
Remove test equipment from airplane.
(e)
Install ram air inlet modulation panel (Ref 21-52-41)
(f)
Install ram air inlet deflector (Ref 21-52-21).
(g)
Close air conditioning equipment bay doors.
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C. Ram Air System Operation Test
(1)
General
(a) Testing the ram air modulation system operation describes method for checking that the system will function correctly to provide modulation during flight, proper positioning of doors and panels on the ground, and adequate airflow for air conditioning operation on the ground or during flight.
(2)
Equipment and Materials
(a)
Controlled Heat Source - Temp Cal probe heater (attachment to Jet Cal engine analyzer) or equivalent
(b)
Air source capable of delivering 15 pounds per minute at 8 to 30 psig
(3)
Prepare to Test Ram Air System
(a)
Open air conditioning equipment bay doors
(b)
Check turbofan oil level (Ref Chapter 12, Ram Air System Turbofan Servicing).
(c)
Provide electrical power.
(d)
Check that the following circuit breakers on circuit breaker panel P6 are closed. 1) L and R TURBOFAN 2) L and R RAM MOD 3) RAM MOD CONT 4) MASTER CAUTION (all except FUEL, if installed) 5) INDICATOR LITS, MASTER DIM BUS (9 places) 6) DIM & TEST (1 place)
(e)
Connect air source to pneumatic system ground service connection.
NOTE: The isolation valve must be opened to provide air to the left ram air system turbofan valve (Ref Chapter 36, Engine Bleed Air Distribution System).
(4) Test Ram Air Modulation System
(a)
Lower wing flaps to any position other than full up (Ref Chapter 27, Trailing Edge Flap System).
(b)
Check that air conditioning PACK switch is in the OFF position.
(c)
Check that turbofan valve is closed.
(d)
Pressurize pneumatic system.
21-52-0 Feb 01/76
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(e)
Disconnect electrical connector that is located on the side of the pack valve visual indicator.
(f)
Check that turbofan valve opens and turbofan starts.
(g)
Check that RAM DOOR FULL OPEN light is on.
(h)
Open RAM MOD CONT (OVERHEAT on airplanes without RAM MOD CONT) circuit breaker.
(i)
Check that ram air inlet deflector doors stay open.
(j)
Manually close turbofan valve and check deflector door rigging. 1) Remove turbofan valve limit switch connector. 2) Remove turbofan valve solenoid connector. 3) Position turbofan valve to closed using manual override button. 4) Check that deflector door track rollers are within 0.10 inch of stops.
NOTE: Full open is with rig pinholes aligned. A rap on the inlet modulation panels by hand may be used to overcome friction for pinhole alignment.
5) Position turbofan valve to open using manual override button.
6) Install turbofan valve solenoid connector.
WARNING: CHECK THAT PERSONNEL ARE CLEAR OF DEFLECTOR MECHANISM PRIOR TO INSTALLING CONNECTORS TO AVOID POSSIBLE INJURY.
7) Install turbofan valve limit switch connector.
(k)
Close RAM MOD CONT (OVERHEAT on airplanes without RAM MOD CONT) circuit breaker.
(l)
Push and hold air sensing test switch on landing gear nodule and check that ram air inlet deflector door retracts to a streamlined position.
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