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JCAB ORAL > Performance > Flashcards

Performance Flashcards

1
Q

What is Vs1g?

A

The speed that corresponds to the maximum lift coefficient (i.e. just before the lift starts decreasing). At that moment the load factor (g) is equal to 1

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2
Q

What is Vmca?

A

The minimum speed with the critical engine inoperative that it is still possible to maintain straight flight with an angle of bank of not more than 5 degrees.

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3
Q

is Vmcg?

A

The minimum control speed on the ground that with the critical engine suddenly made inoperative it is still possible to maintain control of the aircraft using the primary aerodynamic controls alone, to allow the take-off to be safely continued using normal piloting skills.

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4
Q

What is Vmu?

A

The calibrated airspeed at and above which the airplane can safely lift off the ground and continue to take off.

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5
Q

What is Vtire?

A

The maximum ground speed the tires can tolerate. A320 Vtire = 195kts G/S.

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6
Q

What is Vmbe?

A

maximum brake energy speed. The speed at which a full stop can be achieved for a given take-off weight to a maximum value

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7
Q

What is V1 (Decision speed)

A

The maximum speed at which the crew can decide to reject the take-off and be ensured they can stop the aircraft within the limits of the runway.

Vmcg < Vef < V1

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8
Q

What is Rotation Speed Vr

A

The speed at which the pilot initiates rotation at the appropriate rate of 3 deg/sec. that allows the aircraft to reach the screen height of 35 ft above the take-off surface.

V1 < 1.05 Vmca < Vr

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9
Q

What is Take off climb speed V2

A

The minimum speed that must be reached at 35ft above the runway surface.

V2 > 1.13 Vs1g > 1.1 Vmca

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10
Q

What is Regulated Take-off Weight?

A

The maximum weight an aircraft can take-off from a particular runway under specific conditions.

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11
Q

Explain Take-off distance (TOD)

A

TOD (dry) = max of (TOD oei dry) ; 1.15 TOD aeo dry)

oei = one engine inoperative
aeo = all engines operative

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12
Q

How how does TOD wet change?

A

TOD (wet) = max of TOD dry : TOD oei wet

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13
Q

What is Accelerate Stop Distance (ASDA)?

A
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14
Q

What are the take-off flight paths?

A
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15
Q

What are the flight path gradients?

A
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16
Q

What is NET flight path and how much obstacle clearance does it ensure?

A
17
Q

Explain optimized V1 and V2

A

When TODR = ASDR the runway is referred to as balanced field. There can only be one V1 (Balanced V1) that will allow both take off and stopping in the required length.

However when extra runway is available the V1 may be chosen from a range limited by Vmcg and Field Length. An optimized V1 can be chosen that both ensures safety and provides increased payload or reduced take off thrust. This is the basis of V1 optimization.

A higher V2 will give increased payload but reduce obstacle clearance. Again the V2 may be chosen from a narrow range. In the A320 the V2 range is between 1.13 Vs1g and 1.35 Vs1g.

The Fly Smart App calculates an optimized V1 and V2 for the specific weight and conditions entered into the APP.

18
Q

Explain Flex Thrust

A

Flex thrust is reduced thrust based on an assumed temperature (FLEX TEMP)

19
Q

What are the advantages of FLEX

A
  1. saves fuel
  2. saves engine service life
  3. reduced noise
  4. enhanced PAX comfort
20
Q

Are there any disadvantages of using FLEX

A

Performance is reduced and this may be a critical factor

21
Q

What is the Max FLEX

A

ISA + 55

may be lower due to low QNH

22
Q

When is FLEX prohibited?

A
  1. contaminated runway
  2. variable winds associated with TS
  3. Wind-shear
  4. Wet Runway (not regular port)
  5. Items affecting performance (In-op equip)
  6. More than 1 MEL involving performance penalties
  7. FLEX is lower than Flat Rated (ISA + 30)
  8. FLEX is greater than T Max (ISA + 55)
23
Q

Explain Approach and Landing Climb Gradients

A
24
Q

What is Required Landing Distance (RLD) and Actual Landing Distance (ALD)?

A

ALD is the distance from 50 ft to complete stop.

RLD is the actual landing distance /0.6 or multiplied by 1.66.

Before flight (Dispatch) the RLD must be less than or equal to the Landing Distance Available (LDA).

RLD assumes sea level, ISA, no wind, no slope, no reverse (except for contaminated RWY), manual landing, Vapp = Vls (i.e. short field landing)

25
Q

What is Factored Landing Distance?

A

The Factored Landing Distance is calculated in flight and is moregenerally less conservative than RLD. It assumes 7 second flare, reverser credit, touchdown at 96% Vapp, manual or auto-brake, temperature and slope are considered.

The resulting distance is factored by 1.15 (15%) safety margin.

26
Q

What is WET required landing distance?

A

Dry required landing distance x 1.15

27
Q

What is the landing distance required for contaminated runways?

A

The greater of:
1. Wet RLD
2. Distance calculated using contaminated runway data x 1.15

28
Q

What is Cost Index?

A

The ratio of Fuel Costs / Time Costs

CI (LRC) = 40kg/min CI40
CI (max range) = CI 0
CI Min Time = CI 999

29
Q

What is the Line Up Allowance for the A320?

A

An allowance deducted from the the published TORA, TODA and ASDA

30
Q

Why does JJP use a minimum Single Engine Acceleration Altitude of 1500 ft?

A

Because the inhibit phase for most ECAMs is 1500 ft. We should wait until the failure appears on the ECAM before taking action.

31
Q

What obstacle clearance does the net flight path ensure.

A

35 feet dry and 15 ft wet

32
Q

What is today’s performance limit?

A

TOW-TOW = structural limit

33
Q

Why do we use CONF 1 + F for Take off.

A

JM-1 fuel savings overrides other considerations

34
Q

What is the max rate of descent considered for an overweight landing without requiring an inspection?

A

360 ft/min

35
Q

When would you consider an overweight landing?

A
  1. The conditions specified in FCOM or if an emergency exists
  2. Following situations:
    a. any malfunction that would render the aircraft un-airworthy
    b. any event or combination of events where safety could be degraded or compromised unless an expeditious landing is accomplished.
    c. serious illness of crew or passengers that requires immediate medical attention.

JCAB ORAL (8 decks)

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