Scheduled Performance Flashcards
Define MAC.
Mean Aerodynamic Chord
The chord of an imaginary aerofoil that is rectangular but with the same area and aerodynamic properties as the actual wing.
What is the MAC for the Phenom?
1.64m
Define payload.
The weight of the occupants, baggage, and cabinet contents.
What makes up Ramp Weight?
The Zero Fuel Weight + all fuel.
What is a moment?
A turning effect of any weight about a point of balance.
What is the expected probability of an aircraft suffering a structural failure over its planned life?
1:1000
What is meant by metal fatigue?
The propagation of cracks due to repeated cycles of stress.
Define stress.
Load force per unit of cross sectional area.
Define strain.
Deformation due to stress.
(i.e. deformation per unit length)
What graph maps the relationship between stress levels and endurance?
S-N Curve
- S - Percentage of ultimate stress.
- N - number of cycles to failure.
What design philosophy requires the regular monitoring of cracks for acceptable damage?
Damage Tolerance
What are the four design philosophies for fatigue management?
- Infinite Lifetime - over-engineered;
- Safe Life - fixed life with no significant failure;
- Fail Safe - no single failure will be catastrophic;
- Damage Tolerance - monitoring visible cracks.
What is the main form of lower wing stress?
Tensile (tension) stress.
For a Perf. A aircraft, what is the normal screen height?
35ft
For a Perf. A aircraft, what is the screen height for wet runway conditions?
15ft
Define V1.
Decision Speed
- The max speed during T/O at which the pilot must have taken the first action (close thrust levers) to stop the aircraft within the ASDA.
- The minimum speed during T/O following a failure of the critical power unit at which the pilot can continue and T/O and achieve screen height within the TODA.
- VMCG < V1 < VR & VMBE.
What is the purpose of SP?
To calculate the max regulated T/O weight in given conditions.
What is the difference between gross and net performance?
- Gross performance* is the average actual performance of an aircraft (flown iaw prescribed techniques).
- Net performance* is gross performance less an applied safety factor.
How many stages can SP be broken into, and at what points does each stage commence and conclude?
6 stages, however only 4 are usually used.
- Take Off - Brake Release Point to Screen Height.
- Take Off Climb - Screen Height to 1500 above surface datum.
- En-Route - 1500ft above departure surface datum to 1500ft above destination surface datum.
- Landing - 1500ft above destination surface datum to a full stop.
What is a clearway?
A defined area under the aerodrome authority, either side of the runway centreline and at the end of the runway, that is cleared of obstacles that would affect the initial climb.
What condition is assumed if an airfield is described as a balanced field?
TODA = ASDA
(i.e. it ignores the clearway)
Define stopway.
A rectangular area at the end of, and same width as, the runway designated as a suitable area in which an aircraft can be stopped in the case of an aborted T/O.
What do the letters in EASA stand for?
European Aviation Safety Agency
Define VR.
Rotation Speed
The speed at which the pilot initiates rotation with the intention of becoming airborne.
What classification is the Phenom with respect to SP planning?
Perf. A
Define TORA.
Take Off Run Avaliable
The length of runway avaliable for the take off run.
Define ASDA.
Acceleration Stop Distance Available
The TORA plus any stopway.
Define TODA.
Take Off Distance Avaliable
The area avaliable, under airfield authority, cleared of obstacles and thus avaliable between BRP and attaining screen height.
Limited to a max of 1.5 TORA.
What speed should you attain by the end of the TODA?
V2
What does the Weight, Pressure Altitude, Temperature (WAT) limit affect?
The climb gradient.
Should V1 be higher or lower than usual in wet conditions?
Lower, it allows for longer stopping distance on a wet surface.
Define VMBE.
Max Brake Energy Speed
The highest speed on the ground from which the aircraft can safely stop within the energy capabilities of the brakes.
What determines a T/O Climb segment change?
A configuration (or thrust setting) change.
What modelled climb gradient must be sufficient to miss all obstacles within the defined T/O climb domain?
One Engine Inoperative (OEI) net climb gradient.
The OEI conditions assume the critical engine is inoperative.
By what vertical distance must the aircraft clear obstacles in the T/O Climb?
35ft
By how much, and under what circumstances does the avoidance height increase during the T/O Climb?
Increases to 50ft if 15º AoB used
(and/or maybe a heading change of 15º who the fuck knows)
What’s a good noise abatement speed?
V2 + 10 kts