NOTE: When instructions are given to push and hold sensing switch, the switch must be held in until subsequent instructions are given to release the switch. If switch is released prematurely the entire test may have to be repeated.
(m)
Release air sensing test switch and check that deflector returns to the extended position.
(n)
Push and hold ground sensing test switch on landing gear module and check that ram air deflector door retracts to a streamlined position with the airplane body and that RAM DOOR FULL OPEN light stays on.
(o)
Raise wing flaps either electrically or hydraulically.
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NOTE: Although either electrical or hydraulic operation can be used, electrical operation may be more convenient.
1) Electrical flap operation. a) Drive wing flaps fully up electrically and check that inlet modulation panel and exhaust louvers travel toward closed position.
NOTE: Flap actuation is complete when electric actuator motor stops driving.
1 If air inlet modulation panel does not move toward closed position, check that mach trim switch opened.
NOTE: Flaps must be fully up in order to open mach trim switch.
2 If mach trim switch did not open, trailing edge flap system is malfunctioning (Ref Chapter 27). b) Check that turbofan stops and RAM DOOR FULL OPEN light goes out.
2) Hydraulic flap operation. a) Open L and R RAM MOD circuit breakers. b) Release ground sensing test switch and drive flaps fully up hydraulically. c) Push and hold ground sensing test switch and check that turbofan stops. d) Close L and R RAM MOD circuit breakers. e) Check that RAM DOOR FULL OPEN light goes out. f) Check that inlet modulation panel and exhaust louvers travel toward closed
position. 1 If air inlet modulation panel does not move toward closed position, check that mach trim switch opened.
NOTE: Flaps must be fully up in order to open mach trim switch.
2 If mach trim switch did not open, trailing edge flap system is malfunctioning (Ref Chapter 27).
(p)
After exhaust louvers have ceased moving, open RAM MOD CONT or OVERHEAT (as applicable) circuit breaker.
(q)
Release ground sensing test switch.
(r)
Check clearance between trailing edge of louver and nearest adjacent louver is 0.65 to 1.00 inches.
(s)
Remove ram air control sensor from the air cycle machine compressor discharge duct.
(t)
Apply heat to ram air control sensor probe to a temperature of 230 +15/-0°F (110 to 118°C). Check that inlet modulation panel and exhaust louvers travel toward open, RAM DOOR FULL OPEN light comes on and deflector door remains in streamlined position.
(u)
Remove heat source.
(v)
After allowing time for sensor to cool check that inlet modulation panel and exhaust louvers return to closed position (Ref (4)(r)) and RAM DOOR FULL OPEN light goes out.
(w)
Reinstall ram air sensor in the air cycle machine compressor discharge duct.
(x)
Press and hold ground sensing test switch.
(y)
Close RAM MOD CONT circuit breaker.
(z)
Lower wing flaps either electrically or hydraulically.
1) Electrical flap operation.
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a) Drive wing flaps down and check that as flaps leave the zero position in the inlet modulation panel and exhaust louvers move toward open, RAM DOOR FULL OPEN light comes on, turbo fan starts and deflector stays in streamline position.
2) Hydraulic flap operation. a) Open L and R RAM MOD circuit breakers. b) Release ground sensing test switch and drive flaps fully up hydraulically. c) Push and hold ground sensing test switch and check that turbofan stops. d) Close L and R RAM MOD circuit breakers, then check that inlet modulation
panel and exhaust louvers move toward open, RAM DOOR FULL OPEN
light comes on and deflector stays in streamline position.
(aa) Release ground sensing test switches and check that ram air inlet deflector door moves smoothly to open without contacting adjacent structure. 1) Check that deflector door track rollers are within 0.60 inch of stops.
NOTE: Difference between cycled dimension and rigged dimension represents allowable system tolerance.
(ab) Connect electrical connector disconnected in step (e) to pack valve. Check that turbofan valve closes and turbofan stops.
(5) Restore Airplane to Normal Configuration
(a)
Remove air source and close air conditioning equipment bay doors.
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