FADEC Fails Flashcards

1
Q

What happens to the engine power when the FADECs fail?

A

Fuel flow is fixed at a certain rate so the engine speed does not change

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2
Q

Explain low and high side FADEC fails

A

Low = Fails at a low power setting with N1 below 80% meaning to set 80% twist grips will be wound back
High = Fails at a high power setting with N1 above 80% meaning to set 80% twist grips will be wound up

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3
Q

“FADEC FAIL” Caution BF

A
  1. Collective lever - Adjust as necessary to maintain RRPM within limits
  2. Affected engine - Identify by small collective changes
  3. Respective twist grip - Adjust slowly to set 80% N1

After landing

  1. Respective twist grip - Reduce before lowering the collective pitch lever to full down
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4
Q

When the FADECS fail, what backup funtions/safety systems are lost regarding engine control?

A

Automatic power accelerating and deceleration
N1/TQ limiter
Normal start

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5
Q

You have made small inputs into the collective, how do you tell which engine is the affected engine?

A

The affected engine will maintain the same N1, TOT and TQ value while the good engine will change its power to maintain Nr

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6
Q

You are established upwind about to turn crosswind and see the FADEC FAIL” caution in the CAD, explain your actions through CANCA to safely land the aircraft

A

C - “FADEC FAIL CAUTION”
A - Safe height. HDG, speed - Complete the boldface
N - “This is a land as soon as practical EMRG, my intentions are to continue the circuit and land normally”
C - “NFP can you make a PAN call and inform TWR of our intentions”
A - Checklist actions complete, pre landing checks, PWP completed

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7
Q

What setting should N1 be set too in the event of a FADEC failure?

A

80% +/- 2% (78-82%)

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8
Q

When should AEO and OEI limits be applied to the aircraft?

A

AEO - Affected engine is producing more that 30% TQ
OEI - Affected engine producing less than 30% TQ

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9
Q

What is the minimum TQ that can be used on the working engine?

A

10%

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10
Q

What kind of approach is best flown with a FADEC Fail?

A

Shallow angle airfield approach

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11
Q

How do your actions for a double FADEC fail differentiate from a single?

A

Basic actions remain the same however both engines must be controlled, lever down = reduce throttle, lever up = increase throttle

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12
Q

Explain CANCA for a simultaneous double FADEC failure?

A

C - “Master caution, FADEC FAIL system 1 and 2”
A - “Safe heigh, heading, airspeed” —> Boldface Coll, Affe, Resp, Prac
N - Land as soon as practical EMRG, shallow airfield approach
C - I’ll get you to make a PAN call
A - “Get out the double engine failure BF - Complete pre landing checks - PWP”

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13
Q

What does “TWIST GRIP and DEGRADE” mean on the CAD and what are your actions if these are the only cautions visible?

A

The respective engine is in a degraded mode (TWIST GRIP and DEGRADE will come up together)
Actions: Are to check the twist grip is neutral and land - Practical

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14
Q

What does “ENG MANUAL” mean on the CAD and what are your actions if these are the only cautions visible?

A

The MODE SEL SW has been set to manual mode
- Auto accel/decel, N1 limiters and normal start are lost

Actions if not selected:
- Check switch is NORM
- Set twist grip to neutral
- Check ENG MANUAL and TWIST GRIP captions off
- Wait 10 sec to confirm

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15
Q

What does “REDUND” mean on the CAD and what are your actions if these are the only cautions visible?

A

Indicates a load of FADEC redundancy

*Note: No effect on fuel control just redundancy, refer to checklist”

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16
Q

What is overspeed protection and when would it likely be used?

A

During a engine overspeed due driveshaft fail the engine will speed up, go past N2 and be shutdown automatically

17
Q

What are the conditions of engine overspeed due driveshaft failure?

A

RRPM decrease
Affected engine:
- TQ to zero
- N2 above limits (then gets shutdown)

*Likely to see OVSP and ENG FAIL after being shutdown”

18
Q

Engine overspeed - driveshaft fail boldface

A
  1. OEI flight condition - Establish
  2. Affected engine - Identify
  3. Single Engine EMRG shutdown - Perform:
    • ENG MAIN sw (confirm correct ENG) - IDLE, check indications, then OFF
19
Q

What are the conditions of engine overspeed due governing failure?

A

Conditions:
- RRPM warning
- N2 increased of affected engine
- TQ on affected engine is high

20
Q

Engine overspeed due governing failure boldface

A
  1. Collective - Raise to maintain N2 and Nr
  2. Affected engine - Identify
  3. TWIST GRIP (affected engine) - Reduce TQ until normal engine takes load
  4. Collective lever - Readjust as required to stay within limits
  5. ENG Mode SEL sw - MAN
  6. TWIIST GRIP (affected engine) - Adjust TQ manually 20-30%
  7. Collective - Readjust as necessary
21
Q

Explain the ICS process for the twist grip

A

FP moves hand onto desired twist grip and states “number one/two twist grip identified”
NFP visually checks hand position and states “Confirmed”
FP makes required change by stating “Reducing TQ/Increasing TQ/Adjusting N1” etc