Systems - Engines

Question 1

Engine Start Abort Criteria

Answer 1

• No positive oilpressure indication within 10 seconds after N2 speed starts to increase.
• During engine start with a tailwind, when a positive increase of N1 is not indicated before starter cutout (50%N2). In this case, the airplane is repositioned prior to engine start to minimize tailwind effects.
• No ITT indication within 30 seconds after initiation of fuelflow (no lightoff).
• ITT exceeds start limit (815°C-Hot).
• Oil pressure stabilizes below the engine limits.
• N1 and/orN2 failing to accelerate to stable idle speed (hungstart).
• An intermittent electrical pneumatic or starter malfunction occurs before the starter disengagement.

Question 2

Engine Start Parameters

Answer 2

• Times Start: at initial N2 rotation
• 10 seconds: Positive Oil Pressure
• 7% N2: Monitor ignition
• 20% N2: Verify Fuel Flow
• Light-off: Within 30 seconds after fuel flow
• N1 Rotation: Prior to Start Cutout (approximately 50%)
• 50% N2: Verify IGN A (B) goes out
• Engine Stabilization: ITT tick mark moves.

Question 3

When will ATTCS provide reserve thurst automatically?

Answer 3

• Difference between both engine N1 values is greater than 15%
• One engine failure during takeoff.
• One engine failure during go-around.
• Windshear warning.

Question 4

What type of engines does the E175 have?

Answer 4

CF34-8E5

Question 5

Can you change the thrust mode manually?

Answer 5

Yes, via the TRS page on the MCDU.

Question 6

What’s the difference between MAX and TOGA?

Answer 6

About 1,200 lbs of thrust.

Question 7

When will thrust change from TO to CLB.

Answer 7

• Landing gear retracted
• Airplane is above 400 AGL
• Any Change in vertical mode

Question 8

When will thrust change from CLB to CRZ?

Answer 8

Airplane is level at the preselected altitude for 90 seconds and,

The airspeed is within 5 kts (or .01 M) from preselected airspeed.

Question 9

When will thrust change to CON?

Answer 9

Automatically if engine fails at or above 3,000 AGL

Manually if selected in the MCDU (TRS page)

Question 10

When will thrust change from CRZ to GA?