7.25. Abort/Rejected Take Off

[This section deals with the procedures to be followed for discontinuing a take-off. We have used the term "Abort" in this section. Other popular terms are "Reject", " Reject Brakes", and "Refuse". The choice of terms to be used is yours, however you should be consistent throughout your operation.]

[In developing procedures for aborting a take-off consider the following:

Provide general guidelines for when the take-off should be aborted and when it is probably safer to continue the take-off with a malfunction. In the following example, the guidance refers to the Abnormal Take-off section later in the chapter for situations that do not require an abort.

Make a clear statement that an abort is not to be attempted after V1 or a decision speed If your type of Aeroplane requires a procedure for recovery on the remaining runway after V1, decision speed, or after the Aeroplane has lifted off, we recommend that two procedures be developed. One abort procedure would apply to an abort up to V1 or decision speed The second procedure would provide guidance for aborting between V1 and the point where landing on the remaining runway is not feasible.

Provide very clear guidance on the decision making process to abort a take-off or to continue. In developing the guidance consider the following:

Many abort situations do not become apparent until the Aeroplane speed is very near to V1 decision speed.

The process to decide to continue or to abort (including initiation of the abort) shall not take longer than the period allowed for as part of the certification. That is, the time from recognition of a problem at V1 / decision speed until the time that deceleration begins is included in the calculation for the performance charts of the Aeroplane. This time is very brief. In many cases there is only sufficient time to direct that an abort is to occur. There is malfunction. Any delay in commencing an abort at V1 may result in the Aeroplane running off of the take-off surface, or becoming airborne uncommanded and possibly out of control.

Whatever you determine as the process for deciding to take-off or abort, it must be described very clearly.

We recommend that a drill and checklist be specified for the abort. However, as an effective abort will likely require very specific pilot actions, a detailed procedure would probably be useful.]

[In our example (for a fictitious Aeroplane) the pilot may initiate an aborted take-off, and bring the Aeroplane to a stop. For our example Aeroplane, an abort cannot be safely carried out after V1.]

A take-off shall be aborted if the Aeroplane speed has not exceeded V1 or the decision speed and a situation develops that the safety of the Aeroplane would be jeopardized if the flight is continued. For abnormal or emergency situations when the Aeroplane speed is in excess of V1, in most cases the safest course of action is to continue the take-off and deal with the situation in flight. For all aborted take-offs where the Aeroplane speed has not exceeded V1, the following procedure is to be used. If it is necessary to abort a take-off at a speed greater than V1 no procedure is specified. However, it is recommended that the abort before V1 procedure be used to the extent practical. For situations at or below V1 where safety of the Aeroplane would not be jeopardized by continuing the flight, see section on Abnormal Take-offs later in this chapter.

Pilot Procedure - Abort Take Off
Pilot
-- Upon recognition
- Initiate "Aborting"
* POWER LEVERS — Both to Disc
Raise the power lever triggers and select them to the discing position.
* Braking — Maximum until stopped
Apply maximum braking until stopped or until it is clear that maximum braking is not required. Initially maximum braking should be applied as brakes may only be available for a brief time. If normal brakes have failed use emergency brakes as described in AFM.
* Reversing — a/r
Use reversing if necessary and within the limits of directional control
* When Aeroplane has stopped — applicable drill/check
When the Aeroplane has stopped carry out the actions for the applicable drill. Unless it is obviously safe to taxi, stop the Aeroplane on the runway.
* Evacuation Drill — initiate if req'd
The Evacuation Drill is initiated only if required and only by the Pilot. It is carried out by the Pilot
If it is safe to taxi, clear the active runway.

 
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