V Speeds

Question 1

Vcef

Answer 1

Critical Engine Failure Speed
The speed you can accelerate to on all 4 engines, lose one, and then either continue the takeoff or abort within the same distance on 3 engines

Question 2

Vnef

Answer 2

Non-Critical Engine Failure Speed
The speed at which you can accelerate on all 4 engines and then stop with 2000 feet remaining

Question 3

S1

Answer 3

Decision Speed
Prior to this speed you can abort after it you are committed to takeoff

Question 4

Vr

Answer 4

Refusal Speed
The maximum speed which the aircraft can accelerate under normal conditions and stop within the remaining runway

Question 5

Vmca

Answer 5

Inflight Minimum Control Speed
the min speed at which you can lose an outboard engine an d maintain straight-line directional control using the following:
1. Full rudder deflection
2. Not more than 5 degrees of bank
3. 3 engines at TRT

Question 6

Vmcg

Answer 6

Min Controllable Gnd Speed
The min speed at which you can lose an outboard and maintain directional control with engines at takeoff N1

Question 7

Vrot

Answer 7

Rotation Speed
The speed at which you change from the 3 point attitude to the takeoff attitude. It is reached 3 seconds prior to takeoff speed

Question 8

Vto

Answer 8

Takeoff Speed
The speed at which the aircraft must be accelerated prior to leaving the ground.
Always greater than Vmca

Question 9

Vmb

Answer 9

Maximum Braking Energy Decsion Speed
Highest speed from which the aircraft can be stopped without exceeding maximum energy absorption capability of the brakes.

50 million foot pounds for carbon brakes

Question 10

Vnb

Answer 10

Normal Brake Energy Decision Speed
50% of Vmb (25 million foot pounds)

You will egress if you abort above this speed.

Question 11

Vcb

Answer 11

Cautionary Brake Energy Decsion Speed
80% of Vmb, thermal fuse plugs may melt, only used in non-critical takeoff planning

Question 12

Critical Takeoff Considerations

Answer 12

1. CFL + 2000 > Runway Available
2. CRN < 4
3. S1>Vcb
4. Obst Clearance < 1.0% of Obst Dist from DER

TRT or MCL recommeded for critcal takeoffs

Question 13

TRT

Answer 13

Takeoff Rated Thrust
affected by temp, press, acm on/off, anti-ice on/off, PMC on/off
*If EGT limit is reached before TRT N1, abort

limit 5 mins

Question 14

MCL

Answer 14

Maximum Climb
250 KCAS below 10,000
280 KCAS above 10,000

Question 15

MIN

Answer 15

Minimum N1
The lowest setting at that will achieve minimum performance requirements

Question 16

CRN

Answer 16

Climb Reference Number

does not equate to a climb gradient

Question 17

MCT

Answer 17

Max Continuous Thrust

Question 18

MCR

Answer 18

Maximum Cruise Thrust

Question 19

Basic Airplane Weight

Answer 19

weight of aircraft, engine oil, survival kits, oxygen, and unusable fuel

Question 20

Operating Aircraft Weight

Answer 20

Basic Aircaft Weight plus weight of crew, pax, cargo