Bell 412 - Power Plant (Flight Safety manual) Test-
Questions with Correct Solutions
What two identical units does the Pratt and Whitney of Canada PT6T-3DF Twin-Pac
consist of?
A. Free-shaft turbines driving the main transmission
B. Free-turbine turbo shaft engines driving a combining gearbox
C. Gas producer sections driving a common power turbine
D. N1 sections driving identical N2 sections which drive the main transmission.
Free-turbine turbo shaft engines driving a combining gearbox
The primary purpose of the gas producer (N1) section is to drive the:
A. Main transmission
B. Combining gearbox
C. Power turbine (N2)
D. Nl accessory section
Power turbine (N2)
The starter-generator, fuel control unit, and N1 tacho generator are mounted on the:
A. Combining gearbox
B. Underside of the N2 section
C. N2 accessory section
D. N1 accessory section
, N1 accessory section
The overall combining gearbox:
A. Reduces N2 rpm
B. Combines both engines' power output
C. Mounts and drives various N2 and C-box accessories
D. All of the above
All of the above
The combining gearbox is actually:
A. One section which reduces engine rpm
B. Divided into two sections of N2 gear reduction
C. Divided into three sections—two for gear reduction and one for combining
D. Divided into four sections--two for gear reduction, one for combining, and one for
torque sensing, limiting, and sharing
Divided into three sections—two for gear reduction and one for combining
N1 tachometer generator signals are used to indicate the percent of each engine's N1 rpm
on the N1 gauge and to:
A. Actuate the low rpm light and audio warning systems
B. Actuate each engine's ENGINE OUT warning light and particle separator system
Questions with Correct Solutions
What two identical units does the Pratt and Whitney of Canada PT6T-3DF Twin-Pac
consist of?
A. Free-shaft turbines driving the main transmission
B. Free-turbine turbo shaft engines driving a combining gearbox
C. Gas producer sections driving a common power turbine
D. N1 sections driving identical N2 sections which drive the main transmission.
Free-turbine turbo shaft engines driving a combining gearbox
The primary purpose of the gas producer (N1) section is to drive the:
A. Main transmission
B. Combining gearbox
C. Power turbine (N2)
D. Nl accessory section
Power turbine (N2)
The starter-generator, fuel control unit, and N1 tacho generator are mounted on the:
A. Combining gearbox
B. Underside of the N2 section
C. N2 accessory section
D. N1 accessory section
, N1 accessory section
The overall combining gearbox:
A. Reduces N2 rpm
B. Combines both engines' power output
C. Mounts and drives various N2 and C-box accessories
D. All of the above
All of the above
The combining gearbox is actually:
A. One section which reduces engine rpm
B. Divided into two sections of N2 gear reduction
C. Divided into three sections—two for gear reduction and one for combining
D. Divided into four sections--two for gear reduction, one for combining, and one for
torque sensing, limiting, and sharing
Divided into three sections—two for gear reduction and one for combining
N1 tachometer generator signals are used to indicate the percent of each engine's N1 rpm
on the N1 gauge and to:
A. Actuate the low rpm light and audio warning systems
B. Actuate each engine's ENGINE OUT warning light and particle separator system
