Powerplant & Hydraulics

Question 1

THE “EEC” FUNCTIONS ARE:

Answer 1

• Regulates a given power, by controlling the stepper motor (in HMU), to obtain a predicted torque.
• Ensures minimum propeller speed control, on ground and at low power = propeller fuel governing mode. The EEC automatically increases the fuel flow to maintain a minimum propeller speed (NP = 70.8 %).
• Delivers automatic uptrimmed takeoff power to the remaining engine (ATPCS) in case of engine failure at takeoff. The Auto-Feather Unit (AFU) of the failed engine sends a signal to the EEC to report the failure.
• Controls the modulated opening of the Handling Bleed Valve (HBV) in order to ensure correct LP compressor operation.

Question 2

A “GATE” PREVENTS “PL” ANGLE REDUCTION BELOW FLIGHT IDLE:

Answer 2

• At takeoff, as soon as both landing gear absorbers are released, a gate prevents PL angle
  reduction below FI.
• At landing, as soon as one landing gear absorber is compressed, this gate is automatically
  retracted and the PL can travel down to GI and reverse (below GI).

Question 3

WHEN “ENG START” ROTARY SELECTOR IS IN START A OR B POSITION:

Answer 3

• Exciter is powered when fuel shut-off valve is open (CL feather).
• Starter and exciter are automatically deactivated when NH reaches 45%.

Question 4

THE “AUX PUMP” RUNS AUTOMATICALLY (PB PRESSED):

Answer 4

• In flight: low pressure in the BLUE SYSTEM, landing gear lever is selected down, at least one engine running
• On ground: low pressure in the BLUE SYSTEM, propeller brake not engaged, at least one engine running

AUTO runs pump as soon as:

• • Pressure of ACW blue pump is below 1 500 psi*
• • Propeller brake is released*
• • Gear handle is selected DOWN*
• • At least one engine is running*

Question 5

WHEN PROPELLER BRAKE LOCKING SEQUENCE IS INITIATED (ENGINE ONE STOPPED, ENGINE TWO RUNNING), AUX PUMP…

Answer 5

AUX PUMP stops to run when propeller brake is engaged.

Question 6

WITH THE AIRCRAFT ON GROUND AND RIGHT ENGINE RUNNING AT MAX RPM, THE FOLLOWING MAIN PUMPS ARE ACTIVATED:

Answer 6

BLUE and GREEN

Question 7

WHEN A “LOW PRESSURE” AMBER LIGHT ON GREEN HYDRAULIC PUMP PB COMES ON, THE CROSS-FEED VALVE AUTOMATICALLY OPENS:

Answer 7

False