Week 4

Question 1

Which Chapter do Pratt and Whitney Canada include gearboxes?

Answer 1

ATA 72

Question 2

What is installed to accessories in the accessory gearbox to protect the engine in case of a failure of any component?

Answer 2

Shear Shafts

Question 3

What does the hunting tooth Ratio do for us?

Answer 3

Makes gears wear evenly

Question 4

Straight gears can only be used in which applications?

Answer 4

Gears parallel to each other

Question 5

_______ ________ can be used to transmit power where gears aren’t parallel, but NOISE is a problem

Answer 5

Bevel Gears

Question 6

_______ ________ gears are like Bevel gears but run quieter and produce more power

Answer 6

Spiral Bevel gears

Question 7

________ ________ are gears where teeth are cut at an angle

Answer 7

Helical Gears

Question 8

Depending on the amount of power being transmitted through the helical gear set, both gears will explore __________ ______________

Answer 8

Axial Displacement

Question 9

What’s the simplest way in an accessory gearbox to reduce unwanted movement between compressor and radial driveshafts?

Answer 9

Direct Drive

Question 10

________ __________ allows shaft to move without changing backlash

Answer 10

Stub shaft

Question 11

This type of drive is associated with high RPM’s

Answer 11

Idler Gear Drive

Question 12

___________ _____________ are employed when it is not possible to directly align the radial driveshaft with the external gearbox

Answer 12

Intermediate/Transfer Gearbox

Question 13

When there isn’t enough space on the accessory gearbox, what is used to power remaining components?

Answer 13

Auxiliary Gearbox

Question 14

What are chip detectors wired to on commercial airliners?

Answer 14

EICAS