Module 11: Engine Fuel Flashcards

1
Q

Primary purpose of the fuel system?

A

Give fuel and adjust for temp/press thrust setting

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2
Q

Secondary purpose of fuel?

A

Servo pressure for:

  • Valve actuation
  • ACC operation
  • Engine/CSD/IDG cooling
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3
Q

If the pump is 2 stages, what are each stage?

A
  1. Impeller pump

2. + Gear type

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4
Q

What does the Impeller (first) pump do?

A

Boost flow through H.E.
or
Draw fuel from tank (motive flow)

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5
Q

This stage delivers HIGH pressure fuel to the FCU to ALL engines

A

Gear type (second) pump

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6
Q

What are the sub systems for FCU?

A

FMU

FCS

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7
Q

What does the fuel MANIFOLD do and what is the purpose?

A

`Deliver to nozzle
Single (flow divider built in)
Dual (flow divider separate)

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8
Q

This component atomizes the fuel to provide efficient combustion, the 2 types are SIMPLEX/DUPLEX

A

NOZZLES

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9
Q

Describe a SIMPLEX nozzle

A

One nozzle with SWIRL

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10
Q

Describe a DUPLEX

A

Primary (start to idle)
Secondary (preset pressure)
Protects combustion liner

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11
Q

Purpose of P&D valves / Fuel dividers?

A
  1. Schedule flow to nozzle

2. Cutoff and draining

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12
Q

What are the 4 types of FCU?

A

Hydro mechanical
Hydro Pneumatic
Supervisory EEC
FADEC

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13
Q

This FCU uses 2 governers for SHAFT/PROP and modifies compressor discharge air?

A

HYDROPNEUMATIC

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14
Q

What is the purpose of the EEC?

A

Prevent engine parameters from exceeding

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15
Q

What is FADEC? Purpose?

A

Full Authority Engine Control (start to finish)

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16
Q

What provides the EEC with engine specific info?

A

Programming plug

17
Q

What is the HMU and what are the control functions?

A

Houses control valves

  1. Fuel Metering
  2. Servo control