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Flight crew of air carrier widebody transport aircraft deviated from assigned altitude due to the weight of the aircraft and the higher than normal air temperature restricting the aircraft's performance.
| Attributes | |
| ACN | 230604 |
| Time | |
| Date | 199301 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : hnl |
| State Reference | HI |
| Altitude | msl bound lower : 32100 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhn |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : pacific enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 3400 |
| ASRS Report | 230604 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 8200 flight time type : 600 |
| ASRS Report | 230603 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance non adherence other other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During climb to optimum cruising altitude of FL330, we were assigned 2 altitude crossing restrictions which necessitated lower than normal airspeed in order to comply. Temperature upon level off at FL330 was isa plus 14, and because of this warmer than standard temperature, lower than standard airspeed and a later discovery of a possible passenger count error meaning a heavier than indicated weight, the aircraft was unable to maintain FL330 at climb or maximum continuous power. An immediate request was made to hnl arinc for FL310. While awaiting clearance, it was necessary to descend to FL321 to maintain required airspeed. Upon receipt of clearance to FL310, descent was made and flight proceeded normally. Supplemental information from acn 230603: a discrepancy in our passenger count resulted in the aircraft weight being approximately 10000 pounds greater than our figures indicated.
Original NASA ASRS Text
Title: FLC OF ACR WDB ACFT DEVIATED FROM ASSIGNED ALT DUE TO THE WT OF THE ACFT AND THE HIGHER THAN NORMAL AIR TEMP RESTRICTING THE ACFT'S PERFORMANCE.
Narrative: DURING CLB TO OPTIMUM CRUISING ALT OF FL330, WE WERE ASSIGNED 2 ALT XING RESTRICTIONS WHICH NECESSITATED LOWER THAN NORMAL AIRSPD IN ORDER TO COMPLY. TEMP UPON LEVEL OFF AT FL330 WAS ISA PLUS 14, AND BECAUSE OF THIS WARMER THAN STANDARD TEMP, LOWER THAN STANDARD AIRSPD AND A LATER DISCOVERY OF A POSSIBLE PAX COUNT ERROR MEANING A HEAVIER THAN INDICATED WT, THE ACFT WAS UNABLE TO MAINTAIN FL330 AT CLB OR MAX CONTINUOUS PWR. AN IMMEDIATE REQUEST WAS MADE TO HNL ARINC FOR FL310. WHILE AWAITING CLRNC, IT WAS NECESSARY TO DSND TO FL321 TO MAINTAIN REQUIRED AIRSPD. UPON RECEIPT OF CLRNC TO FL310, DSCNT WAS MADE AND FLT PROCEEDED NORMALLY. SUPPLEMENTAL INFO FROM ACN 230603: A DISCREPANCY IN OUR PAX COUNT RESULTED IN THE ACFT WT BEING APPROX 10000 LBS GREATER THAN OUR FIGURES INDICATED.
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.