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Temporary altitude deviation altitude excursion as S80 autoplt experiences an uncommanded disconnect while air holding at FL330.
| Attributes | |
| ACN | 355510 |
| Time | |
| Date | 199612 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lyh |
| State Reference | VA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 355510 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 355410 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
ATC facility: ZDC. Location: lyh 020/40 approximately. On our flight from dfw to phl we were being vectored to lyh for holding at FL330. The aircraft was in a 20 degree bank right turn toward our holding fix when the autoplt had an uncommanded disconnect. The first officer took manual control of the aircraft to arrest the pitch up. The resulting altitude excursion was approximately +300 ft and -250 ft. No deviation was noted or implied by ATC. The altitude deviation lasted only a few seconds.
Original NASA ASRS Text
Title: TEMPORARY ALTDEV ALT EXCURSION AS S80 AUTOPLT EXPERIENCES AN UNCOMMANDED DISCONNECT WHILE AIR HOLDING AT FL330.
Narrative: ATC FACILITY: ZDC. LOCATION: LYH 020/40 APPROX. ON OUR FLT FROM DFW TO PHL WE WERE BEING VECTORED TO LYH FOR HOLDING AT FL330. THE ACFT WAS IN A 20 DEG BANK R TURN TOWARD OUR HOLDING FIX WHEN THE AUTOPLT HAD AN UNCOMMANDED DISCONNECT. THE FO TOOK MANUAL CTL OF THE ACFT TO ARREST THE PITCH UP. THE RESULTING ALT EXCURSION WAS APPROX +300 FT AND -250 FT. NO DEV WAS NOTED OR IMPLIED BY ATC. THE ALTDEV LASTED ONLY A FEW SECONDS.
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.