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2. UH-72 Exam 2 > Fuel System and Power Plant > Flashcards

Fuel System and Power Plant Flashcards

1
Q

What are the three additives that are blended into the military’s JP8 fuel?

A

Fuel System Icing Inhibitor (FSII)
Static dissipation additive
Corrosion Inhibitor / lubricity enhancer

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2
Q

A fuel sample should be taken prior to the [a] [b] of the day.

A

First
Flight

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3
Q

There are __________ fuel tanks in the UH-72 located beneath the cabin floor. (give quantity)

A

4

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4
Q

The major components of the accessory gearbox are the [a] gear train and the [b] gear train.

A

N1
N2

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5
Q

The [a] supplies fuel via the jet pump into the [b] , which supplies fuel via the transfer pumps into the [c] for delivery to the engines.

A

aft main tank
forward main tank
supply tanks

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6
Q

When the (4 way beeper) switch is moved to the left the power of enigne #1 is [a] , while the power of engine #2 is [b] , and the [c] RPM remains constant.

A

Increased
Decreased
Rotor

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7
Q

The prime pumps are located in the [a] tanks while the transfer pumps are located in the [b] tanks

A

Supply
Main

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8
Q

The FWD main tank is connected to the supply tanks by two overflows which are installed at different heights to achieve different volumes of the supply tanks to avoid simultaneous [a] of both [b].

A

Flame Out
Engines

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9
Q

The “TWIST GRIP” caution light will be illuminated on the CAD until the respective engine twist grip is placed in the “[a]” position.

A

Flight

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10
Q

Which engine module reduces the power turbine RPM, and transfers power forward to the power output flange?

A

Reduction gearbox

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11
Q

What is the function of the engine control system?

Select all that apply.

  1. To keep the rotor speed constant under all operations.
  2. To allow manual control of the fuel flow for starting and in case of fuel control failure.
A
  1. To keep the rotor speed constand under all operations.
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12
Q

The symbol on the FLI below indicate the compressor bleed valve is ____________.

A

Open

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13
Q

When you see this display on the CAD the system is alerting you to the fact that your [a] tanks are [b].

A

Main
Empty

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14
Q

The total fuel capacity of the fuel tank systems is [a] pounds. The main tanks hold [b] pounds, the right supply tank (larger) holds [c] pounds and the left supply tank holds [d] pounds. The total fuel quantity in the two supply tanks will always be [e] pounds until the fuel in the main tanks is exhausted.

A

1530
1308
118
104
222

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15
Q

Expand the following abbreviation “VARTOMS”

VA [a]

R [b]

TO [c]

M [d]

S [e]

A

Variable
Rotor
Torque
Matching
System

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16
Q

The [a] [b] turbine drives the compressor.

A

Gas
Generator

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17
Q

The thermocouples on each engine are used to measure what parameter displayed on the FLI?

A

TOT

18
Q

How many stages of compression in the engine’s N1 Section.

A

2

19
Q

The purpose of the Fuel Vent System is to keep the fuel tanks [a] under all operating conditions.

A

unpressurized

20
Q

What engine system has failed?

A

VARTOMS

21
Q

The [a] gear train drives the main transmission, which drives the main and tail rotor systems.

A

N2

22
Q

The [a] gear train drives the starter generator and the oil pump.

A

N1

23
Q

The two sections of the fuel control unit are the [a] control and the hydro-[b] control.

A

Manual
Machanical

24
Q

The VAR NR caution on the Caution and Advisory Display (CAD) and MAN pushbutton for the VARTOMS Mode Selector on the main switch panel illuminate in flight if the engines experience a torque split that exceeds [A]%

A

15

25
Q

In the event of an over-speed, the [a] and [b] valve activates to shut down the engine.

A

Overspeed
Drain

26
Q

During the start sequence, you must turn on the [a] [b] switches in order to supply fuel to the engines.

A

Prime
Pump

27
Q

The [a] gear train drives the starter generator and the oil pump.

A

N1

28
Q

Before attempting an inflight restart, wait for the N1 to equal [a]%

A

0

29
Q

If an engine is shutdown by the over-speed protection system the other engines over-speed protection system will be _______________.

A

Deactivated

30
Q

The Fuel Prime Pumps are used during ___________.

A

Engine Start

31
Q

[a] air is used to aid in start injector ventilation, prevent compressor stalls, and provide cabin heat.

A

Bleed

32
Q

Name the four fuel tanks in the UH-72

[a] main tank

[b] main tank

[c] supply tank

[d] supply tank

A

aft
forward
left
right

33
Q

In the combustion section, both [a] and [b] are mixed together and ignited to create power.

A

Air
Fuel

34
Q

The “ENG OIL P” caution on the CAD below indicates that the [a] has lost its [b].

A

1 Engine

Oil Pressure

35
Q

Refer to the Engine Module graphic and Components List to match each component labeled on the graphic.

Power turbine

Reduction Gearbox

Diffuser

Axial Compressor

Intake cowling

Induction Section

Gas Generator

Radial Exhaust

Transmission Shaft & Accessory Gearbox

A

A. Axial Compressor
B. Gas Generator
C. Power Turbine
D. Transmission Shaft & Accessory Gearbox
E. Reduction Gearbox

36
Q

Match the engine module to its correct purpose/description.

-Power Turbine
-Transmission Shaft
-Accessory Gearbox
-Gas Generator High Pressure Section
-Reduction Gearbox
-Axial Compressor Assembly

B. Provides the second stage of compression, combustion, and first stage of expansion.

E. Provides the first stage of compression.

C. Transforms gas energy into mechanical power to drive the reduction gearbox.

A. The forward supporting structure of the engine and provides the drive gears for the starter/generator, N1 Fuel control/pump and oil pump.

F. The aft supporting structure of the engine, reduces RPM from the power turbine, and transfers power forward to the transmission Shaft

D. Transmits the Power of the turbine to the main transmission.

A

A. Accessory Gearbox
B. Gas Generator High Pressure Section
C. Power Turbine
D. Transmission Shaft
E. Axial Compressor Assembly
F. Reduction Gearbox

37
Q

There are __________ fire detectors mounted in each engine compartment used to indicate an external engine fire.

A

3

38
Q

What conditions must exist to activate the engine fire extinguishing system?

Select all that apply

  1. EMER OFF switch released
  2. BOT1/BOT2 switch depressed
  3. FIRE warning on
  4. N1 RPM of the respective engine less than 50%
A
  1. EMER OFF switch released
  2. BOT1/BOT2 switch depressed
  3. FIRE warning on
  4. N1 RPM of the respective engine less than 50%
39
Q

The engine has an independent [a] [b] lubrication system installed on each engine.

A

Dry
Sump

40
Q

The engine trim 4 way beeper switch on the pilot’s and co-pilot’s collective are only active when the ________ is in the manual mode of operation.

A

VARTOMS

2. UH-72 Exam 2 (5 decks)

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