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Flight crew of air carrier medium large transport aircraft inadvertently computed the takeoff distance in error due to using an erroneous ground temperature reading resulting in a longer takeoff roll than expected.
| Attributes | |
| ACN | 234977 |
| Time | |
| Date | 199302 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : hou |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 12000 |
| ASRS Report | 234977 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 5800 flight time type : 720 |
| ASRS Report | 234870 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Aircraft experiencing automatic pressurization problems during taxi to runway for takeoff. Airport under much construction so attention focused on taxiing then the automatic pressurization problem. Aircraft was 300 pounds under maximum gross for runway, flaps 5, bleeds off takeoff. Takeoff normal except for long takeoff roll. Discussion between pilots late in the flight centered on why the takeoff roll seemed lengthy. Performance data rechked and was correct for 60 degrees F, flaps 5, bleeds off takeoff runway 35. At destination noted the takeoff field temperature was at 60 degrees F 1 hour and 10 mins after actual takeoff. Due to taxi vigilance, pressurization problems and running checklists the runway temperature of 60 degrees for takeoff data may have been in error. This would account for a longer than normal takeoff roll. Suspect reading of 60 degrees on ATIS may have been in error by crew.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT INADVERTENTLY COMPUTED THE TKOF DISTANCE IN ERROR DUE TO USING AN ERRONEOUS GND TEMP READING RESULTING IN A LONGER TKOF ROLL THAN EXPECTED.
Narrative: ACFT EXPERIENCING AUTO PRESSURIZATION PROBS DURING TAXI TO RWY FOR TKOF. ARPT UNDER MUCH CONSTRUCTION SO ATTN FOCUSED ON TAXIING THEN THE AUTO PRESSURIZATION PROB. ACFT WAS 300 LBS UNDER MAX GROSS FOR RWY, FLAPS 5, BLEEDS OFF TKOF. TKOF NORMAL EXCEPT FOR LONG TKOF ROLL. DISCUSSION BTWN PLTS LATE IN THE FLT CTRED ON WHY THE TKOF ROLL SEEMED LENGTHY. PERFORMANCE DATA RECHKED AND WAS CORRECT FOR 60 DEGS F, FLAPS 5, BLEEDS OFF TKOF RWY 35. AT DEST NOTED THE TKOF FIELD TEMP WAS AT 60 DEGS F 1 HR AND 10 MINS AFTER ACTUAL TKOF. DUE TO TAXI VIGILANCE, PRESSURIZATION PROBS AND RUNNING CHKLISTS THE RWY TEMP OF 60 DEGS FOR TKOF DATA MAY HAVE BEEN IN ERROR. THIS WOULD ACCOUNT FOR A LONGER THAN NORMAL TKOF ROLL. SUSPECT READING OF 60 DEGS ON ATIS MAY HAVE BEEN IN ERROR BY CREW.
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.