Pre Checkride Study

Critical engine

The engine that most adversely affects aircraft performance when it becomes inop

Vmc

Minimum controllable airspeed, the lowest airspeed where directional control is maintained when you have one engine. Lower engine performance results in less adverse yaw, which lowers Vmc.

SMACFUM

Standard day:

• On a denser day, Vmc increases because the engine performs better but causes more yaw

Max power:

• More power increases Vmc, because engine performance is better but there is more yaw

Aft CG:

• the arm is shorter with an aft CG, causing more yaw and decreased rudder effectiveness, increasing CG

Critical engine windmilling:

• causes drag, which increases Vmc

Flaps and gear up:

• When the gear and flaps are down (opposite), lift and the keel effect are added, which increases controllability and decreases Vmc. So gear and flaps up increases Vmc.

Up to 5 degree bank: Adds horizontal component of lift, which increases stability, decreasing Vmc.

Most unfavorable weight (lighter): Lighter aircraft has no inertia to keep it flying, which raises Vmc.

Accelerated stop distance

The distance it takes you to start takeoff roll, lose an engine, and stop the aircraft. No chart published, we add the takeoff and landing distances together

Accelerate go distance

The distance it takes to start, lose an engine, and climb 50 feet. We use takeoff roll distance because there’s no chart

What happens to performance as altitude increases

Performance decreases due to less air density, less air through the engine and over the wings

Why is the zero fuel weight important

To make sure the fuselage is within safe limits, so there’s no excess bending of the wings

Single engine service ceiling

Maximum density altitude where you can have a 50fpm climb without the critical engine

Single engine absolute ceiling

Maximum density altitude the aircraft can attain without the critical engine

Vr

72kts

Vx/Vy

77kts

Vyse

Optimal climb speed with one engine, 82kts

Va

120-126

Vloe

Landing gear operating extention speed, 194

Vlor

Landing gear retraction speed, 156

Vmc

68kts

Vno

155kts

Vne

194kts

Instrument approach speed

90kts

Single engine approach speed

82kts

What kind of hydraulic fluid

MIL-H-5606

How much horsepower is our engine

135 horsepower

What liquid is the engine cooled with

1:1 with coolant and distilled water (to prevent mineral buildup).

How is the engine cooled

Liquid cooled, there is a water pump to circulate it. The radiator and the pink radiator fluid cools it

How do you lower the freezing temp for jet fuel

Add prist

How much fluid can the de-ice system hold

7.9 gallons

How long will icing ‘high’ run for

2 minutes