Aircraft Performance with Inoperative Engine

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Questions and Answers

What is the effect of a critical engine inoperative on the power required and total drag?

Increases power required and total drag (correct)

No effect on power required and total drag

Increases power required and decreases total drag

Decreases power required and total drag

How does a higher gross mass at the same altitude affect the gradient and rate of climb?

No effect on gradient and rate of climb

Increases gradient and rate of climb

Increases gradient and decreases rate of climb

Decreases gradient and rate of climb (correct)

What is VX in relation to climb performance?

Speed for best specific range

Speed for best angle of flight path (correct)

Speed for best angle of climb

Speed for best rate of climb

Why does the take-off distance required increase?

Due to slush on the runway Signup and view all the answers

What is the effect of a 75% power setting compared to a 65% power setting?

Increases speed, fuel consumption, and fuel-burn/distance Signup and view all the answers

What happens to the power required when an engine is inoperative?

Increases due to additional drag Signup and view all the answers

What is the effect of a higher gross mass on VY and VX?

VY and VX are decreased Signup and view all the answers

What is the effect of headwind on take-off distance required?

Increases take-off distance required Signup and view all the answers

What can limit the speed of a VMCL?

Available maximum roll rate Signup and view all the answers

What is the correct combination of statements that defines VMCA?

1, 2, 3, 4, and 5 Signup and view all the answers

Why is an MEP with inward counter-rotating propellers easier to control after an engine failure?

The thrust line is closer to the longitudinal axis Signup and view all the answers

What happens when an MEP with clockwise rotating propellers encounters a failure of the critical engine?

It becomes harder to control Signup and view all the answers

What is the effect of an engine failure on an MEP with inward counter-rotating propellers?

It becomes easier to control Signup and view all the answers

What is the condition for VMCA to occur?

Maximum take-off thrust is set and maintained on the remaining engines Signup and view all the answers

What happens when a pilot suffers an engine failure and forgets to feather the propeller?

Glide angle is increased Signup and view all the answers

What is the net flight path gradient after take-off compared to the actual climb gradient if the aeroplane is more than 50 ft above runway elevation?

Smaller Signup and view all the answers

What is the purpose of feathering a propeller in flight?

To reduce drag and minimize yaw Signup and view all the answers

What happens to the yawing effect when one of the engine's propellers are feathered on an MEP aircraft?

The yawing effect reduces Signup and view all the answers

What is the minimum VR speed for a Class B twin engine aeroplane according to CS23?

90 kts Signup and view all the answers

When are the blades of a propeller in the feathered position?

When the drag of the propeller is minimal Signup and view all the answers

Which engine is critical in a twin engine turbo prop with two clockwise props?

The right engine Signup and view all the answers

What is the effect of not feathering a propeller during an engine failure?

Drag and yaw are increased Signup and view all the answers

Which of the following statements about asymmetric effects of the propeller slipstream are correct during an engine failure of a twin-engine turboprop airplane?

1, 2 Signup and view all the answers

What are the effects of feathering a propeller in flight?

Drag and yaw decrease, climb gradient increases Signup and view all the answers

Which condition will result in the least asymmetric yaw and roll in case of an engine failure in a twin-engine propeller airplane?

The engines are mounted on the wings Signup and view all the answers

What will happen to the rolling moment if the right engine fails in a twin engine turbo prop with two clockwise props?

A rolling moment towards the left engine will be induced Signup and view all the answers

What determines the stall speeds of an aircraft?

The CG at the forward limit Signup and view all the answers

What determines the minimum control speeds of an aircraft?

The CG at the aft limit Signup and view all the answers

What will happen to the slipstream-induced lift if the left engine fails in a twin-engine turboprop airplane?

Slipstream-induced lift will be lost on the side where the engine has failed Signup and view all the answers

What is the main factor that affects the net flight path gradient after take-off?

Runway elevation Signup and view all the answers

What is the minimum control speed in the landing configuration?

VMCL Signup and view all the answers

What is the primary factor that limits VMCL?

Maximum rudder deflection Signup and view all the answers

What is the primary purpose of determining VMCG?

To determine the minimum control speed during takeoff Signup and view all the answers

What is the effect of crosswind on VMCG?

It increases VMCG Signup and view all the answers

What is the primary factor that affects VMCA?

Airport density altitude Signup and view all the answers

What is the condition for establishing minimum control speeds during flight tests?

CG position at the most unfavorable location and without nose wheel steering Signup and view all the answers

What must the thrust be in a straight steady climb?

Greater than the drag Signup and view all the answers

What is the primary purpose of determining minimum control speeds?

To ensure safe takeoff and landing operations Signup and view all the answers

Study Notes

Critical Engine Inoperative

Inoperative engine increases power required and total drag due to windmilling engine and yaw moment compensation.
Higher gross mass at same altitude decreases gradient and rate of climb.

Performance

VX: speed for best angle of flight path.
VY: speed for best rate of climb.

Take-Off Distance

Increases due to higher gross mass, downhill slope, slush on runway, and headwind.

Cruise Power Settings

75% power setting increases speed, fuel consumption, and fuel-burn/distance compared to 65% power setting.

Net Flight Path Gradient

Net flight path gradient after take-off is smaller than actual climb gradient.

VR Speed for Class B Twin Engine Aeroplane

Minimum VR speed is 90 kts according to CS23.

Critical Engine

Critical engine for twin-engine turbo prop with two clockwise props is the right engine.

Asymmetric Effects of Propeller Slipstream

Rolling moment towards the running engine is induced.
Slipstream-induced lift is lost on the side where the engine has failed.

Engine Failure

Yawing effect reduces when one engine's propeller is feathered on an MEP aircraft.

Stall Speeds and Minimum Control Speeds

Stall speeds are determined with CG at forward limit.
Minimum control speeds are determined with CG at aft limit.

Minimum Control Speeds

VMCL is the minimum control speed in the landing configuration.
VMCA is the minimum speed at which directional control can be maintained after engine failure.

Straight Steady Climb

Thrust must be greater than drag in a straight steady climb.

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Description

This quiz assesses your understanding of how an inoperative engine affects an aircraft's performance. It covers the impact on power required and total drag.