Parking Brake Post RTO

[FullWings]

Interesting as both cases had fire warnings. In the case of the BA 777, it was hardly a "high speed" reject, I believe they did not even reach 80kts.

The interesting thing about the fire warnings is that they did not occur at the time of the engine failure but some time afterwards. In the Manchester accident, it was ~10s later and they were deliberately not braking much because they had (incorrectly) diagnosed it as a tyre failure. At LAS, it was similar, with the fire warning only coming as they were slowing down with manual braking. By the time the warnings were received and understood, both of the aircraft in question were well alight.

Examples like that support the idea of bringing the aircraft to a halt ASAP, even if the reject happens at slow speed, because at that point you just don’t know how severe the failure actually is. The 737 took ~45s to come to a halt on a taxiway after aborting from 125kts, which didn’t help survivability. If in doubt, stop quickly on the runway.

[vilas]

Our SOP is to set the PB. You can always take it off and taxi away if it becomes the best course of action.

Sensible! Stop means stop and put parking brakes on and do the Abnormal procedures which may include securing the engine by use of single or double engine fire extinguisher and going all the way to EVAC required or not required. If required and you forget to put the parking brake on all good work may end in nothing. If not required one can always put it off and vacate the RW. Do other decision making outside the active runway.

[Matey]

On an RTO in the 737, after stopping, max brake pressure will continue to be automatically applied while the speedbrake is UP. The evacuation checklist calls for the parking brake to be set as the first item in order to prevent aircraft movement because the second item is speedbrake down which releases the brake pressure.
The above assumes auto brakes RTO to a stop. If manual braking is applied during the RTO then the auto brakes disarm and the brake pressure after stopping is controlled by pilot input not the autobrake system

[SRS]

Having spent decades flying for Airlines where English was not their first ( or second) language I have come across the ‘ consider not using parking brakes ‘ often in training. The word [Consider] in Asian and Middle Eastern crews usually mean do not use parking brakes. A friend of mine working at Boeing explained that company lawyers make every effort to reduce Boeing’s exposure to any responsibility when approving manuals.