Performance Definitions

Question 1

Automatic Thrust Control System

Answer 1

Senses engine failure through FADEC and reduces shaft HP on opposite outboard engine if airspeed below Minimum Power Restoration Speed (VMPR)

Reduces:
1) Rudder requirements
2) VMCA
3) VMCG

Question 2

Minimum Power Restoration Speed (VMPR)

Answer 2

Airspeed at which engine is restored to full power (aka AS that allows ATCS to turn off)

Question 3

Best Climb Speed

Answer 3

Higher of speed for MAX ROC or flaps UP air minimum control speed

Question 4

Flaps Up Safety Speed (FUSS)

Answer 4

Min speed recommended for normal operation with flaps retracted.

FUSS is the higher of:
- 1.25x flaps up power off stall or
- flaps up air minimum control speed.

No less than 135

Question 5

Normal Bleed (Takeoff)

Answer 5

Having pressurization, A/C packs, and underfloor heating on

Question 6

All Bleed (Takeoff)

Answer 6

Having pressurization, A/C packs, and underfloor heating on,

PLUS

Engine, and wing and empennage ice protection on

Question 7

Bleed Off (Takeoff)

Answer 7

Having A/C packs, Wing and Empennage off and underfloor switch in FAN

Question 8

Recommended Takeoff

Answer 8

• Runway Availble Longer than Critical Field Length
• Refsual Speed (VREF) is higher than critical engine failure speed (VCEF)
• Because VREF is based on total runway available and VCEF is based on CFL

Question 9

Minimum Recommended

Answer 9

Runway Available Equal to CFL
- RWY and CFL are equal and critical engine failure occuers, the distance to continue on three-engines equals distance to stop.

• VCEF and VREF are equal

Question 10

Not Recommended

Answer 10

Runway Available Less Than CFL
- If an engine fails, it is not possible to stop or continue the takeoff within remaining runway

• Airplane must be downloaded for a safe takeoff (reduce weight)

Question 11

Critical Field Length (CFL)

Answer 11

Runway distance required to accelerate on all engines, experience an engine failure, then continue takeoff or stop within same distance.

Used to determine maximum gross weight for a safe takeoff and climb out.

CFL must be no greater than the runway available.

Question 12

Conditions to determine CFL

Answer 12

Weight
RWY Slope
RWY condition (RCR/RSC)
Ant-Skid
Wind
Drag
Increased Rotation Speed

Question 13

Refusal Speed (VREF/V1)

Answer 13

Based on runway available

Maximum speed to which the airplane can accelerate at takeoff power and stop within remainder of the runway with:
- Two symetric engines in reverse
- One engine feathered
- One engine in ground idle
- Maximum anti-skid braking

A function of temperature and pressure altitude.

Question 14

Critical Engine Failure Speed

Answer 14

Based on CFL

Speed to which plane can accelerate, lose an engine, and either continue the takeoff with remaining engines or stop in the same runway distance`

A function of temperature, pressure altitude, weight, and CFL.

Question 15

One-Engine-Inop Air Minimum Control Speed (VMCA)

Answer 15

Airspeed at which, when critical engine fails, it is possible to maintain straight and level flight with AOB not to exceed 5 degrees.

Question 16

Percent Mean Aerodynamic Cord (MAC)

Answer 16

A value that relates to center of gravity.

Question 17

Operating Area

Answer 17

Based on fuel and cargo weight/ arm, refers to the load (Gs) that may be imposed.

There are four operating areas

Question 18

Two Engine Inoperative Air Minimum Control Speed (VMCA2)

Answer 18

Second critical engine suddenly made inop and able to still maintain straight flight with AOB less than 5 degrees.

Question 19

VMCA2 Conditions

Answer 19

Conditions:
o Eng 1 and 2 failed, props feathered or windmilling
o T/O power on all remaining engines
o Max rudder deflection (limited by 150 pounds of pedal force)
o Flaps 50
o Min T/O Weight
o 5 degree AOB award from failed engines
o Rudder trim for 3 degree appr w/ 3 engines
o Gear up or down

Question 20

VT/O: Takeoff Speed:

Answer 20

The speed at which the aircraft leaves the ground. Normally scheduled to ensure that VT/O is greater than VMCA. Takeoff ground run is the distance from brakes release to this speed.

Question 21

VR: Rotation Speed

Answer 21

The speed at which the pilot initiates the change in aircraft attitude with the intention of leaving the ground. Norm scheduled to ensure that VT/O is greater than VMCA.

A function of temperature, pressure altitude and weight.

Question 22

VOBS: Obstacle Clearance Speed

Answer 22

With an engine failure, VOBS is the target speed to capture and fly until pitch attitude and rate of climb can be reduced allowing the airplane to accelerate to flap retraction speed. A function of temperature, pressure altitude and weight

Question 23

RCR/RSC

Answer 23

• Runway Condition Reading (RCR) is a measure of tire-to-runway friction coefficient.
• RCR is given as a whole number.
• Define the braking characteristics for various runway surface conditions.
• Runway Surface Condition (RSC) is the average depth covering the runway surface measured to 1/10 inch (1 inch is equivalent to a RSC of 10)

Question 24

VMCG

Answer 24

Ground Minimum Control Speed:
Minimum airspeed during the takeoff roll at which when the critical outboard engine is suddenly made inoperative, it is possible to maintain control using rudder control alone and safely continue the takeoff using normal piloting skills.

Engine fail up to VMCG, the plane will deviate 30ft on dry runway.

Above VMCG will lessen deviation