Challenger Crashe at TEB

Jose wrote

Under what circumstances are pilots required to calculate an
accelerate-stop distance, and take off only on a runway that is longer
than that distance?

This runway was longer than the required accelerate/stop distance.
Vr is normally higher than V1 (but not always), it cannot be less
than V1. Once past V1, there is no guarantee that the airplane will
stop on the runway, in fact, if it is exactly a balanced field, it
will not stop on the runway.

He was simply past V1 and probably past Vr when the problem was
recognized.

Bob Moore

Vr is normally higher than V1 (but not always), it cannot be less
than V1.

Isn't that a "mutually exclusive" statement. I guess V1 and Vr could be the
same, I've never seen that. If Vr is the same as some other "V" speed it is
usually the same as V2.

Karl

"Bob Moore" wrote in message
22...
Jose wrote

Under what circumstances are pilots required to calculate an
accelerate-stop distance, and take off only on a runway that is longer
than that distance?

This runway was longer than the required accelerate/stop distance.
Vr is normally higher than V1 (but not always), it cannot be less
than V1. Once past V1, there is no guarantee that the airplane will
stop on the runway, in fact, if it is exactly a balanced field, it
will not stop on the runway.

He was simply past V1 and probably past Vr when the problem was
recognized.

Bob Moore

kage wrote:
Vr is normally higher than V1 (but not always), it cannot be less

than V1.

Isn't that a "mutually exclusive" statement. I guess V1 and Vr could be the
same, I've never seen that. If Vr is the same as some other "V" speed it is
usually the same as V2.

Karl


Global Express, on dry runway V1 and Vr are always the same.

"kage" wrote

Vr is normally higher than V1 (but not always), it cannot be less
than V1.

Isn't that a "mutually exclusive" statement. I guess V1 and Vr could
be the same, I've never seen that.

B-727-200...V1 and Vr were normally the same.


If Vr is the same as some other "V"
speed it is usually the same as V2.

I don't see how that can be considering the "speed increment"
required by the following from FAR Part 25:

(c) V2, in terms of calibrated airspeed, must be selected by
the applicant to provide at least the gradient of climb
required by §25.121(b) but may not be less than—

(2) VR plus the speed increment attained (in accordance with
§25.111(c)(2)) before reaching a height of 35 feet above
the takeoff surface;


Bob Moore
ATP B-727 B-707
PanAm (retired)

"Bob Moore" wrote in message
. 121...
"kage" wrote

Vr is normally higher than V1 (but not always), it cannot be less
than V1.

Isn't that a "mutually exclusive" statement. I guess V1 and Vr could
be the same, I've never seen that.

B-727-200...V1 and Vr were normally the same.


If Vr is the same as some other "V"
speed it is usually the same as V2.

I don't see how that can be considering the "speed increment"
required by the following from FAR Part 25:

(c) V2, in terms of calibrated airspeed, must be selected by
the applicant to provide at least the gradient of climb
required by §25.121(b) but may not be less than-

(2) VR plus the speed increment attained (in accordance with
§25.111(c)(2)) before reaching a height of 35 feet above
the takeoff surface;


Bob Moore
ATP B-727 B-707
PanAm (retired)



Vr and V2 are always the same in a Falcon 50, a part 25 airplane. Go figure!
I never got to fly something big.

Best,
Karl
ATP BE-300 CE-500 LR-Jet DA-50
Helicopter