Aircraft Performance

Question 1

What is flat rated ?

Answer 1

All about temperature change

Question 2

What is the maximum temperature before engines thrust starts reducing ?

Answer 2

ISA + 15

Question 3

How long can TOGA thrust be used for ?

Answer 3

Maximum of 5 minutes or 10 minutes for engine failure.

Question 4

What is the power equation ?

Answer 4

Power = thrust x speed

Question 5

What is specific fuel consumption for:

MRJT

MEP

SEP

Answer 5

MRJT = 2400 kg/hour

MEP = 140 IB/Hour

SEP = 60 IB/Hour

Question 6

What is the formula for power required tangent ?

Answer 6

PR =Drag

Question 7

What is the decimal of Vmp to Vmd

Answer 7

0.76

Question 8

What is Brake release ?

Answer 8

The point at which take off begins

Question 9

What is ground roll ?

Answer 9

The part of take off which takes part on the ground

Question 10

What is airborne ?

Answer 10

The point at which the nose wheel leaves to ground and your nose enters the air.

Question 11

What is VLOF ?

Answer 11

When the main wheels leave the runway.

Question 12

What is Take off run ? TOR

Answer 12

Brake release to VLOF

Question 13

What is TOD?

Answer 13

Brake release to screen height.

Question 14

What is PLTOM ?

Answer 14

Performance limiting Take off mass

Question 15

What is the AOA at Vmd ?

Answer 15

AOA is 4 degrees

Question 16

Which type of trim is the best to use in the cruise ?

Answer 16

Horizontal trim

Question 17

What is the name of the extra drag caused in S&L at cruise due to nose pitching up moment ?

Answer 17

Trim drag

Question 18

What happens to CAS with height ?

Answer 18

It reduces

Question 19

What happens to TAS with altitude ?

Answer 19

It increases

Question 20

What is the optimum speed for S&L flight ?

Answer 20

Where thrust intercepts drag

Question 21

What is the three factors that affect range (in cruise) ?

Answer 21

Fuel flow (SFC), Mass and Wind

Question 22

What are the two types of specific fuel range ?

Answer 22

Specific air range - all about amount of fuel burned over a certain distance.

Specific ground range - all about wind.

Question 23

What is the formula for SAR (specific air range) in straight and level flight ?

Answer 23

SAR = TAS/SFC (*drag)

Question 24

What is optimum speed to achieve the best range for a jet engine ?

Answer 24

1.32 x VMD also known as Mmr (maximum Mach range)

Question 25

What is the optimum altitude for best range, for a jet engine ?

Answer 25

Altitude at which engine RPM is at 90-95%

Question 26

What is the best range for speed and altitude, for a piston engine ?

Answer 26

Speed is at PRtangent (power required tangent)/VMD and altitude is solely dependent on engine SFC, so mostly favourable at mid altitude

Question 27

What are the V speeds for landing ?

Answer 27

VREF - barrier landing speed. Altitude must be 50ft or above. VMCL- control landing speed VS0 - the minimum stall speeds for landing configurations

Question 28

What is the factor that increases for wet runway ?

Answer 28

1.15

Question 29

What is the maximum landing distance percentage for a jet ?

Answer 29

0.6 or 1.67

Question 30

What is maximum percentage stopping distance that cannot be exceed by a prop ?

Answer 30

0.7 or 1.43

Question 31

What is the best speed for angle of climb for Jet ?

Answer 31

VMD. It is called Vx

Question 32

What is best speed for angle of climb for a Prop ?

Answer 32

Vmp. Again called Vx. 0.76 of Vmd | Angle of climb 4 or greater

Question 33

What is the best speed for a Jet for rate of climb ?

Answer 33

1.32 greater than Vmd. Known as Vy

Question 34

What is the best speed for a prop for rate of climb ?

Answer 34

Vmd. Again know as Vy

Question 35

What happens to change over if CAS is slower ?

Answer 35

It increases as you have gained higher altitude so higher Mach

Question 36

What is the ceiling climb rate for a: Jet Prop

Answer 36

Jet: 500ft/minute Prop: 100ft/minute

Question 37

What is the best speed for straight and level flight for a jet ?

Answer 37

When thrust = drag

Question 38

What is the maximum speed for a prop in S+L flight ?

Answer 38

Where power require = power available

Question 39

What is specific range ?

Answer 39

The distance travelled/ fuel flown per unit

Question 40

What is specific fuel consumption ?

Answer 40

The efficiency of the engine. The lower the number the better

Question 41

What is the best speed for best range in cruise for a Jet ?

Answer 41

1.32 times greater than Vmo or Mmo (maximum operating Mach number)

Question 42

What is the best speed for during range for a prop ?

Answer 42

TangPr or Vmd

Question 43

What speed do you fly at for long range cruise ?

Answer 43

4x 1.32 Vmd. Or Mmr

Question 44

What is cost index ?

Answer 44

It is the balance of fuel cost to operational cost.

Question 45

If cost index is 0, what does this mean ?

Answer 45

You are burning minimum fuel, you are flying at 1.32 vmd

Question 46

If cost index is 200, what does that mean ?

Answer 46

You are flying at 4x 1.32 Vmd. Burning the most fuel

Question 47

What is the best speed for best endurance time for a jet ?

Answer 47

Vmd

Question 48

What is the best endurance speed for a prop ?

Answer 48

Vmp or slightly higher, but below Vmd

Question 49

What speed for a STEADY minimum rate of descent ?

Answer 49

Between Vmd and Vmp

Question 50

What speed is for maximum rate of decent ?

Answer 50

Mmo or Vmo

Question 51

What speed to fly for steep glide angle ?

Answer 51

Vmp

Question 52

What speed to fly for shallow glide angle ?

Answer 52

Vmd

Question 53

For glide range (rate of glided descent) what is the best speed ?

Answer 53

Vmd. Cleanest config, minimum drag

Question 54

What happens if mass is increased or decreased on glide angle ?

Answer 54

Unaffected

Question 55

What is the best speed to fly for max glide endurance ?

Answer 55

Vmp. Rate of decent is affected by weight