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Once and engine has been auto-feathered, what protection do you have against the other engine feathering?
The interlock circuitry
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For the prop sychrophase system, which is the master and slave?
Left is Master, right is Slaved to it's speed.
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At what prop RPM will the over-speed governor start to control the prop
Hydraulically?
&
Pneumatically?
1265
&
1308
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What is the function of the Beta backup system?
To prevent the prop entering ground beta range unintentionally due to a PCU malfunction
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What is the propeller inhibited range?
500-780 RPM
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What triggers and autofeather?
When an SCU detect torque is less than 22% on one engine whilst it's about 50% on the other engine
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What is the max rated shaft horsepower for takeoff with uptrim?
2150 (2000 PW120A)
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How much oil does the engine oil system hold?
6 US Gals
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What indication would you have if an ECU has failed or has been selected to manual?
MANUAL indication on ECU mode switchlight and power loss
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What can occur if a Condition Lever is selected too far past START/FEATHER during engine start?
The associated ECU can be deactivated
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What is the model number of the powerplant?
PW121 (PW120A)
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What is the maximum altitude for an airstart?
20,000ft
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If electrical power is removed from an engine instrument, what will the gauge indicate
Pointer to zero, LCD blank
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What happens to the propeller if the associated engine loses oil pressure
Pitch Lock at the point when the pressure is lost. Pitch and RPM stay within 2%
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If an ECU or Torque Motor were to fail during takeoff, why would power rollback be limited to 10 to 20%?
When the ECU fails the Enrichment Solenoid Valve would be de-energized open, manually enriching the fuel flow
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When landing with an inoperative ECU, what precautions should be observed
Do not retard associated power lever below DISC, 2- Feather the associated prop after clearing the runway
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What happens when disarming the autofeather system after an engine failure on takeoff?
Uptrim is disabled and the good engine rolls back 10%
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What cockpit caution or advisory lights would be illuminated if an ECU fails or is not operating
ENG MAN caution light, and Master Caution light flashing
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Why is the ECU selector placed at TOP for takeoff
- Provides fail-fix mode in the event of a minor ECU failure on takeoff (= no initial power rollback), 2-insures that
- only a small amount of power rollback (10 to 20%) will occur if the torque motor fails during takeoff.
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At what percent of Nh does the start sequence terminate?
58%
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If a Torque Motor failure occurs during takeoff, what cockpit indications would be evident?
10% to 20% drop in torque. No caution lights
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What is the rated max S.H.P. for takeoff without uptrim?
1950 (PW120 – 1800)
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If a Torque Motor were to fail during cruise, what indications would be evident?
50% or greater rollback in torque (select ECU off to de-energize Enrichment Solenoid Valve open
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If a major ECU failure occurs during takeoff, what cockpit indications would be evident?
10% to 20% drop in torque and associated ENG MANUAL caution light illuminated with Master Caution flashing
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What two components are used to schedule fuel?
HMU & ECU
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