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MH-60R HAC > NATOPS 2- Powerplant And HMU > Flashcards

NATOPS 2- Powerplant And HMU Flashcards

1
Q

Five sections of engine

A

Intake, compressor, combustor, turbine, and exhaust

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2
Q

Compressor stages

A

Five stage axial and single stage centrifugal, rotor/stater assembly

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3
Q

Combustion section consists of

A

Flow through, annular combustion chamber, two igniters, 12 fuel injectors and receives fuel from the ODV

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4
Q

what is the Gas generator turbine and what does it drive?

A

Two stage, air cooled, high-performance axial design

The compressor and accessory gearbox.

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5
Q

Define the Power Turbine

A

2 stage, coaxial

Shaft connects to the high speed shaft which connects to the input module

TGT is sensed between the two turbines

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6
Q

what is 30% and 70% of Engine airflow used for?

A

30% used for the combustion process, 70% for:

  • compressor inlet temperature (T2) air
  • Compressor discharge pressure (P3) air
  • Combustor and turbine cooling
  • Engine oil seal pressurization
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7
Q

What does the HMU provide?

RANNAF (RANN Away Fast)

A
  • rapid engine transient response through collective compensation
  • automatic fuel scheduling for engine start
  • NG overspeed protection
  • NG governing
  • Acceleration limiting
  • Flameout and compressor stall prevention
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8
Q

NG overspeed protection:

A

HMU mechanically limits NG to 110 +- 2 %

Reaches the position corresponding to an overspeed, a spring loaded valve secures fuel flow the engine.

Once the overspeed condition has passed the valve will open and allow normal operation

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9
Q

The DECU trims ________

A

The HMU to

  • satisfy the requirements of the power turbine load and
  • reduce pilot workload
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10
Q

PCL positions

A

OFF- PAS mechanically shuts off fuel at the shut off valve in the HMU

IDLE- the HMU automatically controls start sequence fuel flow

FLY - that’s the maximum level of power that can be supplied

LOCKOUT - Manually controls NP and NG.
- loses TGT limiting, NP governing, load sharing

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11
Q

Collective is to ________ as PCL is to _________

A

Load demand spindle (LDS)

Power Available spindle (PAS)

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12
Q

Engine-driven fuel boost pump does what:

A
  • Provide reliable suction feed from the aircraft fuel tank to the engine, minimizing fire hazard in the event of damaged fuel lines
  • provides discharge pressure to satisfy the min inlet pressure requirement of the HMU or High-pressure fuel pump
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13
Q

Fuel is tapped off in the HMU for what?

A

1) positions a metering valve to ensure proper fuel flow
2) positions a servo piston actuates variable geometry vane servo and start bleed valve
3) amplifies T2, P3, Ng that influence fuel flow and variable geometry servo position

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14
Q

HMU responds to: 3 things

A 
2 mechanical (LDS, PAS)
1 electrical (DECU) - actuates torque motor servo to trim NG speed
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15
Q

HMU responds to PCL for:

A
  • fuel shutoff
  • Setting engine start fuel flow with automatic acceleration to ground idle
  • Setting permissible NG up to maximum
  • Fuel priming
  • DECU override capability (LOCKOUT)
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16
Q

The HMU provides feedback to the DECU via the _________.

A

Linear variable displacement transducer (LVDT)

17
Q

Why is the engine power in the FLY position more that what is normally required?

A
  • Fail-safe to high power = in case of the loss of the torque motor electrical current
  • Power available with OEI = The operating engine’s gas generator can increase power sufficiently up to its limit to carry the load at the given LDS setting
18
Q

Overspeed and Drain Valve functions:

PPTR

A
  • provides fuel flow to the 12 fuel injectors
  • purges the main fuel manifold to prevent coking of the fuel injectors
  • traps fuel upstream so that priming is not required
  • Return fuel back to the HMU if np overspend or DECU hot start prevention is activated
19
Q

IPS is driven by

A

The AGB

20
Q

SHP of engines?
Continuous?
Intermediate?
Contingency?

A

1662

1800 for 30 min

1940 for 2.5 min

21
Q

Flow of air into Inlet section of engine

A

Air enters, hits swirl vanes, goes through the IPS and -either blown over board by blower assembly- or - hits the deswirl vanes and into the compressor.

22
Q

What type of Engine do we have?

A

T700-GE-401C front-drive turboshaft engine

23
Q

What is the waterwash manifold an integral part of?

A

the swirl frame

24
Q

What does the HMU respond to with the PCL in FLY?

A

collective position through a Load Demand Spindle (LDS)

25
Q

The engine fuel system consists of what?

A

Engine-driven fuel boost pump, fuel filter, HMU, and ODV

26
Q

Engine fuel filter does not filter what?

A

water

27
Q

What routes fuel to the Engine fuel filter?

Where does it go after?

A

Engine-driven fuel boost pump

routed to the HMU High-pressure fuel pump

28
Q

What does the HMU contain?

A
  • High-pressure Fuel pump
  • NG governor
  • Metering Valve
  • LVDT
  • torque motor servo
  • variable geometry vane servo
  • vapor vent
  • shutoff valve
29
Q

HMU Mechanical Linkage: The LDS directly coordinates __ speeds to the approximate power required by the rotor system based on collective position

A

Ng

30
Q

What 3 inputs does the HMU receive to aid it in controlling variable stator vanes and anti-ice/start bleed valve position?

What does this reduce the chance of?

A

T2, P3, and Ng

Compressor stall

31
Q

What trims the metering valve when it is scheduling engine fuel flow commensurate to current power demand?

A

The Torque motor servo in response to DECU signals

32
Q

How does the HMU provide Ng Governing?

A

The HMU receives T2, P3, and Ng inputs from their respective sensors, which are used to schedule fuel for minimum flow, maximum flow, and variable geometry vane control

33
Q

How does the HMU provide Acceleration Limiting?

A

The Ng governor ensures that any PCL motion will result in safe engine operation and will not cause engine damage or an inadvertent shutdown.

34
Q

What are the two types of Engine Limiting?

A
  1. TGT Limiting - defined by reaching either IRP or CRP functions within the DECU/(C)EDECU
  2. HMU-fuel flow limiting - due to the physical dimensions of the fuel lines
    - also is designed to protect the compressor section by limiting fuel flow as a function of Ng and ambient temperature
35
Q

What will happen if you are Engine Limited and increase the collective?

A

The rotors will droop

36
Q

What does the Alternator power?

A
  • ignitor assembly
  • DECU
  • Ng signal to the vertical instruments

MH-60R HAC (55 decks)

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