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An air carrier large transport was slightly high and long crossing a descent fix. Aircraft equipment problem FMC leveled aircraft 3000 ft high 'for no apparent reason.'
| Attributes | |
| ACN | 339950 |
| Time | |
| Date | 199606 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pvd |
| State Reference | RI |
| Altitude | msl bound lower : 24000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw tower : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 21000 |
| ASRS Report | 339950 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
First officer was given descent to cross 40 mi northwest of pvd at FL240. Out of about FL270, aircraft started to level off for no apparent reason. Proper inputs were in FMC. I told first officer that the aircraft was leveling off and to increase descent manually. The first officer then intervened and we were very close to the correct altitude, but possibly a little bit past.
Original NASA ASRS Text
Title: AN ACR LGT WAS SLIGHTLY HIGH AND LONG XING A DSCNT FIX. ACFT EQUIP PROB FMC LEVELED ACFT 3000 FT HIGH 'FOR NO APPARENT REASON.'
Narrative: FO WAS GIVEN DSCNT TO CROSS 40 MI NW OF PVD AT FL240. OUT OF ABOUT FL270, ACFT STARTED TO LEVEL OFF FOR NO APPARENT REASON. PROPER INPUTS WERE IN FMC. I TOLD FO THAT THE ACFT WAS LEVELING OFF AND TO INCREASE DSCNT MANUALLY. THE FO THEN INTERVENED AND WE WERE VERY CLOSE TO THE CORRECT ALT, BUT POSSIBLY A LITTLE BIT PAST.
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.