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Interview Technical Questions > Performance And Flight Planning > Flashcards

Performance And Flight Planning Flashcards

1
Q

Basic splitting up of weight

A

Basic empty mass
Variable load
Traffic load
Fuel load

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2
Q

What makes up dry operating mass

A

BEM and variable load

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3
Q

What makes up useful load

A

Traffic and fuel load

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4
Q

What makes up operating mass

A

BEM, variable and fuel

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5
Q

ZFM is made up of what

A

BEM, Variable, Traffic

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6
Q

Where to have C of G for max range

A

Aft

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7
Q

What is the TORA

A

Useable length of paved runway available for take off

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8
Q

TORR

A

Length needed to unstick at Vr plus 1/3 airborne distance between unstick and screen height

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9
Q

TODA

A

Length of useable runway + clear way that an a/c can use to achieve V2 (TOSS)

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10
Q

What can TODA not exceed

A

1.5 x TORA

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11
Q

TODR

A

Distance needed to accelerate to Vr and attain screen height, not less than V2

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12
Q

Screen height normal and wet

A

35ft, wet is 15ft

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13
Q

ASDA

A

The distance available that an aircraft can use to stop if take off rejected with critical failure at V1

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14
Q

On a balanced field (TODR with one engine = ASDA), where is screen height achieved

A

End of runway

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15
Q

Why is screen height for wet reduced

A

As portion of airborne distance is now on the runway due to longer TORR

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16
Q

What happens if V1 is greater than Vmbe

A

TOW needs to be reduced

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17
Q

Why does aft c of g mean higher VMCG/A

A

Due to a shorter moment arm with the tail, meaning more airspeed needed

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18
Q

What is V2 numerically greater than

A

1.2vs or 1.1 Vmca

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19
Q

7 variables affecting TO and landing perf

A
  1. Weight
  2. Flap setting
  3. Aerodrome pressure alt (low better)
  4. Air density
  5. Humidity
  6. Wind
  7. Length, slope, surface
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20
Q

High pressure alt on perf

A

Less performance due to less air molecules

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21
Q

Decreasing air density (high pressure alt) on performance

A

Lower performance, Increase in take off distance required

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22
Q

No take off on wet runway when

A

Anti skid inop

Standing water over a certain depth

Any other type specific limits

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23
Q

First departure segment

A

Screen height 35ft to gear retraction at V2, positive Roc min 200ft OEI

24
Q

2nd departure segment

A

Gear retraction to alt between 400ft and max 1000ft agl, at V2, 2.4% gradient

25
Q

3rd departure segment

A

Assumes level flight for flap retraction schedule, positive gradient

26
Q

4th departure segment

A

From level off height to net height of 1500ft or more, at MCT, 1.2% gradient

27
Q

What if close in obstacle limited within second segment

A

-Increase TO flaps
-Reduce take off weight
-increase V2 climb
-Vx climb

28
Q

How does increased V2 procedure increase lift

A

Uses a higher speed, which is a function of lift, so great lifting capabilities

29
Q

What climb type uses the least trip fuel

A

Vy

30
Q

What does Vmca (turb pen speed) provide

A

Good margin between stall and structural damage

31
Q

Vdf speed

A

Max diving speed

32
Q

Absolute ceiling

A

Max alt/FL to which an aircraft can climb, unable to climb any further. Low speed and high speed buffet occurs coincidentally, creating coffin corner.

33
Q

What speed for best endurance speed

A

Vmd

34
Q

Max range cruise

A

Speed for max fuel mileage

35
Q

3 enroute operating limits

A
  1. Enroute obstacle clearance
  2. Max range limit
  3. ETOPS limit
36
Q

Point of no return

A

Last point where it’s possible to return to dep aerodrome with fuel remaining

37
Q

Vmcl speed

A

Minimum speed for directional control in the landing configuration

38
Q

Vref

A

Target approach speed over 50ft height at a certain flap setting

39
Q

What speed is Vat equal to

A

1.3Vso or 1.23Vs1g

40
Q

Adjustments to Vref with headwind

A

50% of HW value, up to 20kts

41
Q

Greater weight means what for stall speed

A

Greater stall speed

42
Q

When does coffin corner occur

A

When approaching the point at which low speed stall buffet and the onset of high speed Mach buffet approaches zero

43
Q

Why does coffin corner occur

A

Due to low speed stall and high speed stall margin decreasing towards zero

44
Q

What is the critical Mach number

A

Lowest Mach number at which the airflow over any part of the aircraft reaches speed of sound

45
Q

What happens if aircraft exceed critical mach number

A

The drag coefficient increases suddenly causing a sudden increase in total drag and changes to the airflow pattern

46
Q

Mach tuck

A

The nose pitch down movement due to the rearward movement of the shock wave as a result of accelerating past the critical Mach number

47
Q

What happens to Vx and Vy with a climb

A

Vx constant, Vy decreases

48
Q

Does CofG position effect SFC

A

No

49
Q

What does a higher alt mean for AOA if weight and Mach no constant

A

Higher

50
Q

Turbojet landing factor

A

1.67 (multiple by 1.15 if wet)

51
Q

If asked what distance used to certify plane…

A

factor all engines by 1.15, and choose highest of factored number or one engine inop distance

52
Q

Reference point zero

A

Point where aircraft reaches 35ft

53
Q

Vmca

A

Minimum control speed in the air with max 5 degs bank following loss of the critical engine

54
Q

What does higher atmospheric pressure mean

A

Increased engine performance due to more dense air

55
Q

What atmospheric conditions reduce an aircraft performance

A

-high temps
-low pressure
-low density
-high alt
-high humidity

Interview Technical Questions (11 decks)

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