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B737 flight crew reported rejecting a takeoff at 130 knots due to poor acceleration. While the brakes were cooling the performance data was checked and -40 was found to have been entered in the OAT field in the FMC instead of +40.
| Attributes | |
| ACN | 1381903 |
| Time | |
| Date | 201608 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | LAS.Airport |
| State Reference | NV |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | PMC Performance/Thrust Management Computer |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 187 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 270 Flight Crew Type 1798 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy |
Narrative:
Captain aborted the takeoff when he questioned why acceleration was so much slower than normal. This was on runway 25R in las. Abort airspeed was approximately 130 knots; below V1. We informed the tower and the passengers; exited the runway at A5 taxiway; and went to a hold pad to figure out what the problem was. There I consulted the chart for brake cooling time; which allowed us 30 minutes with brakes released before we could go back to gate. We also found the error in our performance data; a negative had accidentally been inserted into the outside air temperature; so the OAT read minus 40 instead of plus 40. This error had been overlooked when we ran the checklist; and therefore the aircraft had a lower power setting for takeoff. Once we got back to the gate; maintenance met us to inspect the brakes; and thereafter we successfully continued to our destination. I learned the lesson to triple check every single digit in my performance data.
Original NASA ASRS Text
Title: B737 flight crew reported rejecting a takeoff at 130 knots due to poor acceleration. While the brakes were cooling the performance data was checked and -40 was found to have been entered in the OAT field in the FMC instead of +40.
Narrative: Captain aborted the takeoff when he questioned why acceleration was so much slower than normal. This was on Runway 25R in LAS. Abort airspeed was approximately 130 knots; below V1. We informed the Tower and the Passengers; exited the runway at A5 Taxiway; and went to a hold pad to figure out what the problem was. There I consulted the chart for brake cooling time; which allowed us 30 minutes with brakes released before we could go back to gate. We also found the error in our performance data; a negative had accidentally been inserted into the outside air temperature; so the OAT read minus 40 instead of plus 40. This error had been overlooked when we ran the checklist; and therefore the aircraft had a lower power setting for takeoff. Once we got back to the gate; Maintenance met us to inspect the brakes; and thereafter we successfully continued to our destination. I learned the lesson to triple check every single digit in my performance data.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.