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Flight crew of a DC9-30 overshot altitude on descent due lack of autoplt altitude capture and monitoring of altitude.
| Attributes | |
| ACN | 420950 |
| Time | |
| Date | 199811 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 12600 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 5500 flight time type : 100 |
| ASRS Report | 420950 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent (rapid) missed thumbwheel on autoplt while in a turn. Expected leveloff but airplane continued descent which was caught by 400 ft. Returned to altitude assigned. Problem caused by poor autoplt capabilities and oversight by PF during busy phase of flight. Need to keep scan going during altitude changes. ATC asked about altitude deviation which had been corrected by that time.
Original NASA ASRS Text
Title: FLC OF A DC9-30 OVERSHOT ALT ON DSCNT DUE LACK OF AUTOPLT ALT CAPTURE AND MONITORING OF ALT.
Narrative: ON DSCNT (RAPID) MISSED THUMBWHEEL ON AUTOPLT WHILE IN A TURN. EXPECTED LEVELOFF BUT AIRPLANE CONTINUED DSCNT WHICH WAS CAUGHT BY 400 FT. RETURNED TO ALT ASSIGNED. PROB CAUSED BY POOR AUTOPLT CAPABILITIES AND OVERSIGHT BY PF DURING BUSY PHASE OF FLT. NEED TO KEEP SCAN GOING DURING ALT CHANGES. ATC ASKED ABOUT ALTDEV WHICH HAD BEEN CORRECTED BY THAT TIME.
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.