Weight & Balance, Determining Performance, And Engine Systems & Operations Flashcards
Weight x Arm =
Moment
Moment / Weight =
CG
In large aircraft, CG is expressed in
MAC% (Mean aerodynamic chord)
CG range is usually between
15% - 37% MAC
CG aft of limits causes
Unstable pitch conditions regardless or airspeed
Weight shift formula
Weight of cargo moved Distance CG Moved
——————————— = ———————————
Aircraft weight Distance between arms
When determining performance for a short field takeoff over a 50’ obstacle, what speed is most important?
Vx
Performance is decreased by how much with cargo door removed?
5%
When you lose an engine, you lose how much power and climb performance?
50% of power and 70-80% climb performance
What are the two types of rotating props and which do we have?
Conventional and counter rotating. We have counter rotating
SE & ME absolute ceiling is always
0 FPM (Feet per minute)
Service ceiling
100 FPM (Feet per minute)
SE Service Ceiling
50 FPM (Feet per minute)
*one engine is inop
What is a critical engine?
An engine, when out, affects controllability and performance most adversely
Climb performance is based on
Excess thrust
Prop overspeed is usually an indication of
Low N2 pressure
Why are left turning tendencies greater in twin engines?
Because there are two engines
How long should you wait between start intervals?
30 seconds
What are the Left Turning Tendencies?
P: P-factor (Asymmetrical thrust) - Yaw
A: Accelerated slipstream (Induced flow) - Roll
S: Spiraling slipstream (Corkscrew effect) - Yaw
T: Torque (Opposite direction of prop rotation) - Roll
High altitude + High Temperature + High Humidity =
High Density Altitude
