Basic CF6 ( compressor control )

1.Functions of compressor control?
-to prevent stall
2.2 ways to control it
-by control vsv(CIT&T2c) and vbv(feedback of vsv input)

3.VSV inputs?
-N2 & T2C/CIT

4.How CIT and N2 acts on 3D cam?
-CIT:axially and N2:rotationally

5.VBV inputs?
-Feedback of vsv

6.VBV is reset under what conditions?
-Thrust reverser operation and throttle chop

7.VSV is reset at rapid acceleration for what?
-to reduce N1 and EGT overshoot.

8.Where is the position of VSV master feedback cable?
-on L/H master ....

9.What position is used for rigging of VSV?
-In open position.

10.Which one should reached end of travel first; Hydraulic actuators or MEC lever?
-hydraulic actuator

11.Is the extended length for VSV actuator critical when rigging?
-YES:critical

12.What is the purpose of double seal in actuator?
-When leak, first seal leak will be drain through cavity drain

13.When N2 is decreased VSV will
-close

14.When N2 is increased VBV will
-close

15.VBV actuators are closed or opened for rigging?
-closed/...

16.VBV is mounted at what position?
-at 3 o'clock and 9 o'clock

17.Is the length of VBV actuator critical?
-not critical

18.Whatare the purposes of VSV reset actuator?
-reduction of EGT overshoot, reduce pilot workload

19.During rapid throttle burst, what will happen to N1 and EGT?
-increased

20.What stage air is used for VSV reset actuator operation?
-7th stage air

21.Air from VSV reset actuator is discharged to where?
-to LP recoup and joined the fan stream

Basic CF6

Fuel system.

1.How is thrust output measured?-By N1-Fan speed

2.Can N1 be directly controlled by pilot?-Can't N2 only and N2 is coupled to N1 by aerodynamic couple.

3.How is N2 controlled?-By power lever

4.What does the power lever varies to control fuel flow?-Tension of speeder spring

5.When temperature is increase what will happen to N1?-N1 will increase because N1 is varies with temperature

6.Fuel system is controlled from cockpit by what?-Power lever(throttle)

7.What are the 3 levels of idle?-Ground idle, Flight idle and Min idle

8.What is ground idle?-sufficient thrust for taxiing

9.What is flight idle?-Engine accelaration from idle to take off within 8 sec (FAA)

10.What will happen to Ground idle and FLight idle during hot day?-Increase

11.Throttle lever must be moved forward extra on cold or hot day?-hot day

12.What is the purpose of throtlle interlock?-to allow thrust reverser time move to 90% deploy

13.How to varify faulty Mec or CIT sensor?-both G.I and F.I failed if one fail mec fault

14.What is emergency fuel limitations?-at 20000ft, 24 degrees centigrade 3 hours continue and 4 hours cumulative

15.What are the types of fuel nozzles?-Dual/secondary flow special and secondary nozzle

16.Identification of fuel nozzle?-White aluminium(primary), green(secondary), blue(special)

17.odd no ports for what nozzle?-primary/dual flow nozzle

18.even no ports for what nozzle?-secondary nozzle

19.port no 12 is for what nozzle?-special nozzle

20.What air is used to cool nozzle tip?-CDP air

21.What are the inputs for MEC?-PLA, CIT, CDP, N2

22.What are the adjustments available on MEC?-G.I F.I specific gravity VSV and VBV

23.What are the pilot's input into MEC?PLA and HPC

24.What is the GI/FI schedule for-to know aircraft on ground or not and to....

25.When squat switch is energized, it indicates ground or flight idle?-Ground idle

26.Acceleration limit schedule is for-

27.What are the inputs for accel decel limits?-CDP, CIT and N2

28.What are the functions of the MFP?-

29.MFP is attached to?-to AGB by QAD ring

30.Why must the boost pump be 'on' during dry motoring?-to provide lubrication / positive fuel pressure

31.How many stages of MFP?-2 stages

32.What types of pump?-impeller/centrifugal/boost pumps and gear type displacement

33.Where is fuel pressure tapped?-Pump interstage

34.Is there a bypass indication on debris screen?-No

35.Eductors are only effective on wing or tail engine?-Only on wing

36.Location of heat exchanger with reference to MFP?-to the left of MFP

37.Does the fuel line in heat exchanger have a bypass?-No only oil

38.Location of fuel filter with regards to MFP?-to the right of MFP

39.Is the filter element reusable?-yes

40.What switch is tapped across the filter?-differential pressure switch

41.What is the switch for?-

42.What must be done before servicing the filter?-shutt off LP cock

43.Location of P&D valve w.r.t to MEC?-on MEC outlet

44.Functions of P&D valve?-Drain fuel manifold at shutdown

45.Ports on P&D valve?-

46.Fuel manifold is shrouded to prevent what?-

47.Identification band is provided at which connectors?-

48.Where are CIT sensor mounted?-on fan frame at 5&6 o clock

49.What gas is used in CIT?-Helium

50.CIT sensor moves 3D cam in what direction?-Aerial

51.What is the malfunctions on CIT?-Hot shift and Cold shift.

52.CIT is cooled by what?-Air

53.What happens if cam is moved too extreme?-MEC used standard day temperature.