ATA 63 - MR DRIVE

Question 1

When will a HIGH ROTOR RPM warning be triggered?

Answer 1

109% Nr

Question 2

When are Rotor RPM sensors tested?

Answer 2

during the automatic power up self test done by HELIONIX

Question 3

If the Main Xmsn RPM pick-up fails, how is rotor RPM monitored?

Answer 3

By the TR pick-up

Question 4

When will a LOW ROTOR RPM warning be triggered?

Answer 4

94% Nr

Question 5

What RPM can the rotor brake be applied?

Answer 5

50% Nr

Question 6

How many stage reduction is the MGB?

Answer 6

2 stage

Question 7

What is the free wheel clutch for?

Answer 7

to prevent the MGB driving the engines

Question 8

How many parts is the MGB made up from?

Answer 8

2

Question 9

On what part of the MGB would the filler neck be found?

Answer 9

the upper half

Question 10

What is in the upper half of the MGB?

Answer 10

Upper bearings of the gear shaft, the mast and oil filler neck. The it serves as a cover.

Question 11

What type are the lower MGB mounts?

Answer 11

Trunnions

Question 12

What other purpose do the lower MGB Trunnions have?

Answer 12

They act as a stop, coupled withe the ariframe mount, in the case of an emergency if the torque rod broke.

Question 13

The bearing for the mast is what type?

Answer 13

a doube-row self-alinging roller bearing

Question 14

What job doe the lower of the doube-row self-alinging roller bearing do?

Answer 14

Takes axial loads

Question 15

What job does the upper of the doube-row self-alinging roller bearing do?

Answer 15

allows mast bendings and takes radial loads.

Question 16

How many torque rods are there and what material are they made from?

Answer 16

Two titanium torque rods

Question 17

What is the purpose of the torque rods?

Answer 17

They transfer the main rotor reaction torque and resulting longitudinal forces into the airframe structure.

Question 18

How many axis do the MGB mounts support?

Answer 18

Three - Longditudinal, Lateral & Vertical

Question 19

When will a MGB LOW PRESS warning illuminate?

Answer 19

When oil px of BOTH circuits drop below 1 bar

Question 20

How many indications will a MGB LOW PRESS warning give?

Answer 20

Three - Warning unit, Master List, Voice message from AMC 1

Question 21

How many chip detectors are on the MGB?

Answer 21

Two

Question 22

When is Mast Moment indication visable?

Answer 22

below 50kts, or above 50knts and 54%.

Question 23

If a difference in oil px is sensed between the two systems, what advisory will be illuminated?

Answer 23

MGB TREND advisory

Question 24

The Oil Temperature system of the main gear box is monitored by means of what?

Answer 24

High Temp caution, temperture indication, circuit monitoring

Question 25

When is the Chip Indication continuity test perfromed?

Answer 25

During the power-up-self-test and then continually every 10 minutes during flight.