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UH-1N Dash 1 > Engine > Flashcards

Engine Flashcards

1
Q

What is the make and model of the engine of the aircraft?

A

Pratt and Whitney T400 turbo shaft engines

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2
Q

Each engine is flat rated to how much horsepower?

A

1070 shaft horsepower

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3
Q

What is the maximum continuous output from each engine?

A

916 shaft horsepower

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4
Q

How many axial stages does each engine have?

A

3

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5
Q

How many centrifugal stages does the engine have?

A

Single stage

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6
Q

How many power turbine stages does the engine have?

A

Single stage

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7
Q

How many fuel nozzles are in the annual or combustion chamber?

A

14

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8
Q

How many igniter spark plugs are in each engine?

A

2

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9
Q

How is the fuel control system powered?

A

Hydro pneumatically

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10
Q

How is the engine kept free from ice, dust, and other foreign objects?

A

Particle separators

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11
Q

At what engine speed will the particle separator switch close these separator door?

A

Ng dropping below 52 ± 2%

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12
Q

If the particle separator switches off what occurs to the air being ingested by the engine?

A

It will route all induction air into the engine and therefore exposed the engine to FOD

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13
Q

The particle separation door is closed via what 2 mechanisms?

A

If the particle separator switch is placed into off or if the respective fire handle is pulled

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14
Q

How is the particle separator powered?

A

Through the 28VDC essential bus

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15
Q

How is fuel warmed prior to entering the engine?

A

Through an oil to fuel heat exchanger system located on the front face of each accessory gearbox

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16
Q

Above what temperature does the oil to fuel heat exchanger cease operation?

A

Above 32°C

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17
Q

Where is the location of the engine driven fuel pump?

A

The front face of each accessory gearbox between the fuel control unit and the gear cover of each engine

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18
Q

What is the minimum temperature the oil to fuel heat exchanger warms the fuel tube prior to being introduced into the engine?

A

5°C

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19
Q

Does the engine driven fuel pump have a filter?

A

Yes an integrated filter is incorporated into each engine driven fuel pump

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20
Q

How is the automatic fuel control powered on each engine?

A

From a drive shaft connected to the fuel pump on each engine

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21
Q

When in manual throttle mode, how does the fuel control unit measure fuel to the engine?

A

Through manually positioning of the metering valve

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22
Q

How is pressure regulated inside of the engine fuel control unit?

A

A pressure regulated valve maintains a constant pressure at the metering valve to bypass excess fuel back to the engine pump

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23
Q

The primary function of the automatic fuel control system is to prevent what?

A

Ng and NF overspeed as well as to maintain Ng idle speed

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24
Q

How is the manual fuel control unit connected to the engine?

A

Through a direct, geared connection to the Ng section of the engine

25
Q

What is the caution associated with manual fuel?

A

It is possible to overspeed the Ng turbine, NF turbine and to exceed maximum ITT or Q

26
Q

What is the caution associated with operating an automatic fuel?

A

Despite being automatic it is still possible to exceed Ng, NFQ, and IT

27
Q

Where is the power turbine governor located?

A

On the combining gearbox and is driven by its respective engine

28
Q

What is the primary function of the power turbine governor?

A

To obtain maximum performance of the engines with a minimum of attention

29
Q

What is the engine design droop without the droop compensator?

A

12% RPM

30
Q

How does the droop compensator work?

A

When collective is increased, the droop compensator moves the NF governor lever which increases the P3 air pressure. This causes the automatic fuel control to increase fuel flow to the engine and will therefore result in a maintaining NF ±1%

31
Q

What is the expected droop during single engine operation?

A

As much as 3% RPM

32
Q

If the droop compensator binds, what is the safety mechanism to prevent inability to control the engine?

A

A rivet in the collective linkage is designed to shear

33
Q

What is the caution associated with a sheared droop compensator rivet?

A

NF governors will still control NFR PM but transient droop overspeed and recovery time for the engines will increase, collective adjustments should be made slow to prevent rotor decay or overspeed

34
Q

How does the torque control unit work?

A

If an over torque condition is imminent, pneumatic signals are sent to both automatic fuel control units to reduce fuel flow to each engine resulting in reduced torque.

35
Q

What is the torque control unit’s limiter setting?

A

102 to 104% torque

36
Q

How does the torque control unit work?

A

It sums the torque pressures and compares them against a spring reference internally

37
Q

How are the fuel sense line heaters powered?

A

Through the DC central bus, heaters are automatic and no cockpit indications are provided

38
Q

How many fuel nozzles are used during the starting sequence?

A

7

39
Q

What is the governing range for the power section of the turbine?

A

97 to 100% NF

40
Q

How is the idle stop release switch powered?

A

28 Volt DC essential bus

41
Q

How does the idle stop release switch work?

A

A solenoid and a plunger for each throttle acts as a stop, activation of the switch removes the stop from the system allowing the throttle to be brought above or below the idle range

42
Q

The governor switch acts on which valves?

A

The fuel control solenoid valves which bypass the automatic fuel control governors

43
Q

The instructor control panel allows for what?

A

Allows for override of the pilots start switch

44
Q

What is the caution associated with the pilot override switch?

A

With the switch in the off position it is possible to engage both starters simultaneously, this should not be attempted due to extreme voltage drain which may result in the destruction of the aircraft battery

45
Q

What are the four components of the engine ignition system?

A

An ignition exciter unit, two igniter plugs, starter generator, and start switch

46
Q

What switch must be on for engine start to be completed?

A

The ignition key lock switch must be in the on position

47
Q

Which clock positions are the igniter plugs located at within the combustion chamber?

A

4:00 and 11:00 positions

48
Q

Which lighting system is disabled when this start switch is engaged?

A

The anti collision lights

49
Q

The torque meter is energized by which electrical system?

A

26 Volt AC bus

50
Q

What are the three cautions associated with the torque meter?

A

A single filled torque signal converter will cause the respective torque press circuit breaker to pop and cause a freeze of the torque indication providing inaccurate real time reading. If both torque signal converters fail it will cause both torque press circuit breakers to pop and all torque indications to freeze. If the 26 volt transformer fails, indications will resemble a dual torque signal converter failure but the circuit breakers will not pop

51
Q

How are the inter turbine temperature gauges powered?

A

Through the 115 Volt essential bus

52
Q

What is the purpose of the ITT bias box?

A

They provide for adjustment of ITT indications based on signals from the engine when compared against a standard for operating conditions

53
Q

How is the triple torquemeter powered?

A

By three tachometer generators mounted on engines #1, 2, and the transmission. These systems are self generating and therefore electrical power is not required

54
Q

How is the gas producer tachometer powered?

A

Powered by the accessory gearbox for each engine respectively, no electrical power required

55
Q

How is engine oil temperature measured?

A

An electrical resistance type bulb located in the lower part of the accessory gearbox

56
Q

How is the engine oil pressure measured?

A

Engine oil pressure transmitter located on the lower part of the accessory gearbox adjacent to the oil temperature bulb

57
Q

How is the oil temperature bulb powered?

A

28 Volt essential bus

58
Q
A

UH-1N Dash 1 (3 decks)

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