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A B777 check airman reports a pretkof ACARS performance revision may have caused the crew to select an incorrect takeoff flap setting confign.
| Attributes | |
| ACN | 704570 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer observation : company check pilot |
| ASRS Report | 704570 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : company policies non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Flight from ZZZ1 to ZZZ2 was planned for a flaps 15 degree takeoff and maximum power. I was conducting an atlantic re-qualification on a captain fairly new to the aircraft. During taxi out the load closeout was delayed. When the load arrived; the takeoff weight was lighter than the planned takeoff weight. When the takeoff data uplinked; standard power was indicated but the speeds were much higher than planned. Further examination indicated that the flaps had changed in the FMC. We reset the flaps back to 15 degrees in the FMC and corrected the power and V speeds. We were cleared for takeoff and applied power. We received a confign warning that was interpreted as a gear confign warning and it sent out as the aft began to track down the runway. The takeoff appeared normal and the initial climb was normal. As I later re-examined the odd FMC uplink; I realized that we might have possibly made the takeoff with an incorrect flap setting. Although I am not sure of this fact my awareness of this potential has caused me great concern.
Original NASA ASRS Text
Title: A B777 CHK AIRMAN RPTS A PRETKOF ACARS PERFORMANCE REVISION MAY HAVE CAUSED THE CREW TO SELECT AN INCORRECT TKOF FLAP SETTING CONFIGN.
Narrative: FLT FROM ZZZ1 TO ZZZ2 WAS PLANNED FOR A FLAPS 15 DEG TKOF AND MAX PWR. I WAS CONDUCTING AN ATLANTIC RE-QUALIFICATION ON A CAPT FAIRLY NEW TO THE ACFT. DURING TAXI OUT THE LOAD CLOSEOUT WAS DELAYED. WHEN THE LOAD ARRIVED; THE TKOF WT WAS LIGHTER THAN THE PLANNED TKOF WT. WHEN THE TKOF DATA UPLINKED; STANDARD PWR WAS INDICATED BUT THE SPDS WERE MUCH HIGHER THAN PLANNED. FURTHER EXAM INDICATED THAT THE FLAPS HAD CHANGED IN THE FMC. WE RESET THE FLAPS BACK TO 15 DEGS IN THE FMC AND CORRECTED THE PWR AND V SPDS. WE WERE CLRED FOR TKOF AND APPLIED PWR. WE RECEIVED A CONFIGN WARNING THAT WAS INTERPED AS A GEAR CONFIGN WARNING AND IT SENT OUT AS THE AFT BEGAN TO TRACK DOWN THE RWY. THE TKOF APPEARED NORMAL AND THE INITIAL CLB WAS NORMAL. AS I LATER RE-EXAMINED THE ODD FMC UPLINK; I REALIZED THAT WE MIGHT HAVE POSSIBLY MADE THE TKOF WITH AN INCORRECT FLAP SETTING. ALTHOUGH I AM NOT SURE OF THIS FACT MY AWARENESS OF THIS POTENTIAL HAS CAUSED ME GREAT CONCERN.
Data retrieved from NASA's ASRS site as of January 2009 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.