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

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