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B747-100 at gate received planned takeoff data message which was in error. Flight crew recognized the error and doublechked it by getting maximum takeoff gross message which still had the incorrect data. Flight crew determined it was ok to continue since the aircraft was 50000 pounds below maximum takeoff.
| Attributes | |
| ACN | 387300 |
| Time | |
| Date | 199711 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sfo |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 216 flight time total : 20000 flight time type : 216 |
| ASRS Report | 387300 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 185 flight time total : 9900 |
| ASRS Report | 387071 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Chart Or Publication |
| Air Traffic Incident | other |
Narrative:
While reviewing the computer generated 'planned takeoff data message' with the flight engineer at the gate (before the 'before engine start' checklist) we noticed a discrepancy in the maximum allowable takeoff weights versus runway(south) on the bottom of the form. Since we were relatively light for takeoff (approximately 630700 pounds) I was not worried. The supposed error seemed to put the maximum allowable weights too high. The flight engineer pulled up a detailed mtog message from ACARS, but that did not have the correct data either. We as a crew determined that this error did not affect us because we were over 50000 pounds below these maxs. The first officer urged me to agree to turn in this problem to the company, and I agreed. Our flight proceeded without incident using the flight manual numbers.
Original NASA ASRS Text
Title: B747-100 AT GATE RECEIVED PLANNED TKOF DATA MESSAGE WHICH WAS IN ERROR. FLC RECOGNIZED THE ERROR AND DOUBLECHKED IT BY GETTING MAX TKOF GROSS MESSAGE WHICH STILL HAD THE INCORRECT DATA. FLC DETERMINED IT WAS OK TO CONTINUE SINCE THE ACFT WAS 50000 LBS BELOW MAX TKOF.
Narrative: WHILE REVIEWING THE COMPUTER GENERATED 'PLANNED TKOF DATA MESSAGE' WITH THE FE AT THE GATE (BEFORE THE 'BEFORE ENG START' CHKLIST) WE NOTICED A DISCREPANCY IN THE MAX ALLOWABLE TKOF WTS VERSUS RWY(S) ON THE BOTTOM OF THE FORM. SINCE WE WERE RELATIVELY LIGHT FOR TKOF (APPROX 630700 LBS) I WAS NOT WORRIED. THE SUPPOSED ERROR SEEMED TO PUT THE MAX ALLOWABLE WTS TOO HIGH. THE FE PULLED UP A DETAILED MTOG MESSAGE FROM ACARS, BUT THAT DID NOT HAVE THE CORRECT DATA EITHER. WE AS A CREW DETERMINED THAT THIS ERROR DID NOT AFFECT US BECAUSE WE WERE OVER 50000 LBS BELOW THESE MAXS. THE FO URGED ME TO AGREE TO TURN IN THIS PROB TO THE COMPANY, AND I AGREED. OUR FLT PROCEEDED WITHOUT INCIDENT USING THE FLT MANUAL NUMBERS.
Data retrieved from NASA's ASRS site as of July 2007 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.