B757 Review Questions

Engines and APU

• What conditions cause the engine to increase from minimum idle to approach idle and how long does approach idle maintained during the

landing rollout?

• When the engine anti-ice is activated, or the landing gear is down, or the flaps are set to 25 or 30 degrees. The engine remains in approach

idle for 5 seconds after touchdown.

Engines and APU

• What is the effect of CLIMB 1 on the TMC?

• When CLIMB 1 is selected, approximately 94% of the normal climb power is supplied

by the engines.

Engines and APU

• TRUE / FALSE: Raising either thrust reverser handle shuts off the auto throttle

system

• True

Engines and APU

• What is the primary purpose of the EEC, and ELC system?

• Over-boost protections, and Over-speed protection respectively.

Engines and APU

• Why do we start the left engine first?

• So the PTU will not start

Engines and APU

• The thrust reverser status indicator is AMBER, what is the position of the

associated reverser?

• The reverser is unlocked or is in transit.

Engines and APU

• Engine start load shed ends when?

• When engine N3 is above 50%

Engines and APU

• What is the primary thrust parameter for the B757?

• EPR

Engines and APU

• What is the function of the thrust management computer?

• Calculates a reference EPR based on existing pressure altitude and ambient

temperature data from the air data computer for Takeoff.

Engines and APU

• What is the function of the TO/GA switch on the TMSP?

• It is used to select takeoff thrust on the ground and go-around thrust in flight.

Engines and APU

• What engine indications are displayed on the EICAS secondary display?

• N2, N3, fuel flow, oil pressure, oil temperature, oil quantity, and engine

vibrations.

Engines and APU

• TRUE FALSE: Normal APU start consists of two flashes of RUN and one flash of a

FAULT light

• True

Engines and APU

• In flight with APU running you shut off the battery, does this cause the APU to

shutdown?

• No

Engines and APU

• What is indicated when the engine fuel valves and/or spar valves are illuminated?

• The valves are not in agreement with the fuel control switch, or the respective fire

switch.

Engines and APU

• What is the function of the engine start selector switched to GND?

• Opens the start valve, arms the selected igniter.

Engines and APU

• When would you use RICH to start the engine?

• Below EGT 0 degrees

Engines and APU

• How long is the start selector automatically held in GND?

• Until 50% N3.

Engines and APU

• What is the function of the start selector in AUTO?

• Closes start valve and terminates ignition. Selected igniters operate continuously with flaps extended and/or engine anti/ice ON.

Engines and APU

• What is the normal starter duty cycle?

• Three cycles of up to 2 minutes continuous operation and run down to N3 0%, followed

by 15 minutes of cooling.

Engines and APU

• What is the extended engine starter duty cycle?

• Up to 4 minutes operation followed by a 15 minute cool down.

Engines and APU

• You are in severe turbulence, the start selector should be set to _____

• CONT

Engines and APU

• Do auto throttles respond to manually set EPR values?

• No.

Engines and APU

• When would you expect the engines to be in low idle?

• When in ground operation, if flight with gear up, flaps less than 25 degrees, and

engine anti ice off.

Engines and APU

• Where are the APU fire controls located outside the aircraft?

• Nose Gear

Engines and APU

• Auto throttles are only powered by what bus?

• Left AC

Engines and APU

• How many batteries are required to start the APU?

• Two.

Engines and APU

• Under what condition is the APU time-delay feature bypassed during APU

shutdown?

• If the APU bleed has already been closed for 60 seconds.

Engines and APU

• What is the APU starter duty cycle?

• Maximum three attempts within 60 minutes.

Engines and APU

• TRUE/FALSE: EEC and ELC operate with all electrical failure

• TRUE

Engines and APU

• Will you get EPR indications on STANDBY electrical power?

• No.

Engines and APU

• What is the function of the APU battery?

• Electrical power for starter, inlet door, and control circuitry

Engines and APU

• What is the function of the aircraft battery in relation to APU operation?

• Provides electrical power for fire protection, fuel valve operation, DC fuel pump, and

control circuitry backup.

Engines and APU

• What is the service ceiling of the APU operation

• 42,000’

Engines and APU

• What is maximum altitude for APU electrical and pneumatic power?

• 42,000’, and 17,000’ respectively

Engines and APU

• What would the illumination of the APU amber fault light indicate?

• APU fuel valve is not in commanded position, or the APU has shut down due to a

fire or fault.

Engines and APU

• What does the blinking RUN light indicate on APU startup

• A self test of the control circuitry

Engines and APU

• What will cause the APU to automatically shut down on the ground?

• Fire or Fault

Engines and APU

• What lights illuminated when the oil pressure is at or below minimums, i.e. the

red line (18psi)?

• ENG OIL PRESS

Engines and APU

• What does the D-TO above the EPR mean on the upper EICAS during takeoff

• A de-rated takeoff using FLEX temperature is scheduled

Engines and APU

• The intermediate pressure compressor section and the intermediate pressure

turbine on a common shaft on the rotor.

• N2.

Engines and APU

• Climb two is normally used for what?

• Noise abatement - reduced thrust

Engines and APU

• The only oil filter that has a bypass provision is the?

• Scavenge

Engines and APU

• Except during takeoff or go around, if the normal operating range of engine

parameters is exceeded the indicators change from ?

• White to amber or red - as appropriate.

Engines and APU

• If the Secondary Engine display is not in view when the engine vibrations

exceeds_____ , the vibration monitors will automatically display

• 2.5 units

Engines and APU

• TRUE/FALSE: The engines may be operated without the EEC?

• True

Engines and APU

• During takeoff or go-around, N1, EGT, N2 and N3 remain white for _______after the

amber band is reached and _______for single engine operation.

• 5 minutes; 10 minutes

Engines and APU

• The engine is available for unrestricted use even though the oil temperature is _____in

the band?

• Amber

Engines and APU

• The engines are ______axial flow turbofans of high compression and bypass ratio and

are rated at ________pounds of thrust

• Three-rotor; 42,700

Engines and APU

• Is it normal for the APU FAULT to illuminate temporarily during APU start or

shutdown?

• Yes.

Engines and APU

• TRUE/FALSE: With the APU operating on the ground, and the Battery Switch selected to OFF, the fire detection continues to be

available until the APU actually shuts down?

• False

Engines and APU

• During APU start, the Fault light comes on and goes off as an indication that?

• The fuel valve opened

Engines and APU

• If the APU has been selected to shut down, but the RUN light is still illuminated, the

shutdown cycle can be canceled by ?

• Momentarily rotating the APU selector to START

Engines and APU

• During APU start the APU battery powers the ?

• APU starter motor, the APU control circuitry, and operates the air inlet door.

Engines and APU

• If the APU is supplying pneumatic power at the time of shutdown, the APU bleed valve closes first and APU shutdown is delayed

for ?

• 60 to 120 seconds