As I write this, a business jet was just on the news for rejecting a takeoff at a small airport in California that led to a fire that, by all accounts, destroyed the airplane.
On the same day, I was evaluated during a flight by a check airman, and the rejected takeoff (RTO) procedure was a point of discussion—in our case because my captain, whom I have flown with before, does a more-detailed-than-typical briefing of the procedure. My airline requires a full briefing of the RTO on the first leg of a trip or during a crew change. The reason is simple: RTOs at high speeds are high-risk events.
The airlines typically use 100 knots as the threshold between “low” speed and “high” speed. In the high-speed regime, aborts are generally done for one of four reasons: wind shear; an engine failure; a fire of any kind; or the belief that the airplane is unsafe to fly.
Further, this procedure is practiced every time we visit the simulator, and we practice it during takeoffs from either seat. This is important, because it may be prudent for the first officer—technically the second in command, in a rare moment making a command decision—to initiate the maneuver. Most carriers would dictate that the captain will assume command of the airplane at a safe point in time. This is done not just because the captain is in charge, but also because the RTO checklist is very specific about who does what, and it is predicated on the captain being in control of the airplane as it slows down.
I don’t know what happened in the California event, but there are very few acceptable reasons for an RTO to lead to an airplane leaving the runway and getting consumed in a fire (in this case, thankfully, there were no injuries).
Further, I don’t have any idea what the background or training of the crew was. But that said, any pilot in a turbine aircraft of any kind should not only be proficient in the maneuver of an RTO, but also should brief the mechanical steps that will be executed in order to bring the aircraft safely to a stop on the remaining runway. Closing the thrust levers, activating the thrust reversers, verifying the deployment of the spoilers, and maximizing the use of brakes are pretty standard steps.
RTOs are high risk because they are likely to occur when the airplane is accelerating at an accelerating rate, and may even be close to V1 or rotation speed. Remember that once you reach V1, you are committed to taking the airplane airborne and troubleshooting in flight. In other words, the wings will be generating a fair amount of lift, and the weight of the airplane will not be fully set on the wheels. It’s important to destroy that lift as quickly as possible and get the weight back on the wheels in order for the brakes and the drag of the airplane itself to work to your benefit. Weight on the wheels also will allow the tires to better grip the runway, which will also slow you down.
The act of aviating is terribly unforgiving of indecision and delayed reaction, and arguably, the high speed RTO is the event with the smallest window of time in which a tremendous error in action and judgment can occur. Don’t let it happen to you. Prepare for it, brief it, and fly it.—Chip Wright