Drives

Question 1

What is the main rotor and tail rotor RPM at 101%?

Answer 1

main rotor= 289

tail rotor= 1403

Question 2

If its cold out side should I worry about the NGB popping the bypass indicator?

Answer 2

No, its has a thermal lock out to prevent pop-up when the oil is cooler that 29.5 degrees C

Question 3

When does the NGB thermal lock out protection disengage?

Answer 3

When NGB or temperature is between 46-67 degrees C

Question 4

On pre flight what must the NGB oil be in the sight glass?

Answer 4

Half way

Question 5

If the NGB pop-up is out what does that mean?

Answer 5

That the NGB oil filter may need servicing and that its has an impending bypass. likely reset and check on post flight. If popped again make an entry on the -13.

Question 6

If all the oil leaked out of an NGB how long can I expect it to operate?

Answer 6

approximately 30 minutes due the felt wicking.

Question 7

How many complete oil systems does the transmission have?

Answer 7

2

Question 8

What happened if too much oil leaks out of one of the transmission of systems?

Answer 8

An electric diverter valve in the sump of the low side will close to conserve remaining oil.

Question 9

Is the chip detectors in the NGB fuzz burning?

Answer 9

Yes, they will burn minor fuzz

Question 10

Is the Chip detector in the Transmission fuzz burning?

Answer 10

No

Question 11

Will the transmission oil diverter valves still work if both generators fail?

Answer 11

Yes, the valves are on the 28v Emergency battery BUS

Question 12

How many oil pumps are in the Transmission?

Answer 12

3, 2x main pumps and accessory gear box has it’s own that pulls from sump 2 for APU operations

Question 13

How long does felt wicking lubricate the transmission?

Answer 13

30 minutes

Question 14

how many thermistors are located on the IGB and TRGB?

Answer 14

4, each and they feed information the DMS and are part of the MSPU

Question 15

How many drive shafts are there?

Answer 15

7

Question 16

On preflight what are you looking for when you look at the drive shafts?

Answer 16

all hardware is installed and that there are no scratches or gouges in the shaves

Question 17

When you rotate the #7 drive shaft should it turn both ways?

Answer 17

No, it should only turn on way due to the sprag clutch

Question 18

If the transmission seizes can I still auto rotate?

Answer 18

Yes, there is a shear point located at the base of the main rotor drive shaft that should break free and allow the rotor to freely however, it is very likely not to have any tail rotor thrust in this event