2022-08 · NASA ASRS report 1923391
Air carrier flight crew reported a rejected takeoff due to a Runway Awareness and Advisory System alert.
We were operating Aircraft X from ZZZ to ZZZ1; with a planned departure from Runway XX; due to the remaining runways being closed. Based on our performance calculations; we were legally and safely able to depart from that runway. We lined up on Runway XX and pushed up the thrust levers for takeoff. Just after commanding 'set thrust'; we received an aural alert stating 'CAUTION SHORT RUNWAY; SHORT RUNWAY'; as well as an EICAS message stating ' SHORT RUNWAY'. I immediately rejected the takeoff and retarded the thrust levers. We notified ATC; taxied clear of the runway; and found a spot to park the aircraft in coordination with ATC. After bringing the aircraft to a stop and completing the after landing checklist; I called the Duty Officer; who arranged a conference call with Captain. Based on their guidance; we temporarily selected the GND PROX RUNWAY OVRD switch to inhibit the RAAS (Runway Awareness and Advisory System) from giving us another alert on our subsequent takeoff. We completed the RTO checklist; as well as the after start and before takeoff checklist; verified our fuel was sufficient per the Flightplan/Release; and proceeded for another takeoff; which was uneventful. The RAAS on the B777 did what it was programmed to do; which is to alert the crew on a runway that has an available length of less than 7;500 ft. and the ground speed is greater than 40 kts. Runway XX at ZZZ has 7;278 ft. available. Not being familiar with this particular alert; I decided to reject the takeoff. I have never encountered this scenario in my six plus years of operating the B777; mainly because takeoffs on relatively short runways are rare; but I also do not recall seeing this scenario in any training environment. Maybe I missed it somewhere along the line; but it could be incorporated in a future syllabus.
On initial takeoff on Runway XX at ZZZ (both long runways were closed) as the aircraft accelerated through 40 kts.; an EICAS alert 'CAUTION SHORT RUNWAY' illuminated on the center MFD; and simultaneously an aural caution sounded 'CAUTION SHORT RUNWAY.' The Captain immediately rejected the takeoff around 45 kts. We exited to the right on Taxiway XX and stopped the airplane. We communicated with Tower that we needed a few minutes to build a new plan and run checklists. The Captain called the Duty Officer and Chief Pilot to confirm our game plan of continuing the mission since this caution is normal for takeoffs on runways less than 7500 ft. We then proceeded with the flight with nothing significant to report. Both pilots were surprised by the EICAS and aural CAUTION during the takeoff roll. The performance numbers were all normal and appropriate for the 7;278 ft. runway. Upon further review; we discovered it is a normal caution for a takeoff on a runway less than 7;500 ft. Introduce the possibility of this caution during takeoff roll in simulator training and/or Training Manual.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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