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DO328 aircraft in cruise encountered moderate turbulence and requested lower altitude. ATC cleared aircraft to 17000 ft and PF, first officer misheard altitude setting and descended 500 ft below assigned until captain corrected the setting.
| Attributes | |
| ACN | 357610 |
| Time | |
| Date | 199701 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zob |
| State Reference | OH |
| Altitude | msl bound lower : 16500 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zob |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 235 flight time total : 4450 flight time type : 1100 |
| ASRS Report | 357610 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot inflight encounter other non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight from flint, mi, to pittsburgh, PA, we encountered moderate turbulence at FL210. We asked for ride reports, however we were told that we were 'leading the pack.' we requested a lower altitude from ZOB. They gave us 17000 ft. While passing through FL180 the altimeter setting was given. Due to the turbulence and rapid descent rate the altimeter setting was not understood except xx.34. I, as the PF tuned 30.34. At approximately 17300 ft MSL, the captain corrected the setting to 29.34. The new altimeter setting caused the actual altitude to be lower than the 17000 ft selected altitude causing the autoplt not to capture. At 16500 ft I disconnected the autoplt and immediately returned to 17000 ft. Cleveland then cleared us to 15000 ft at our discretion.
Original NASA ASRS Text
Title: DO328 ACFT IN CRUISE ENCOUNTERED MODERATE TURB AND REQUESTED LOWER ALT. ATC CLRED ACFT TO 17000 FT AND PF, FO MISHEARD ALT SETTING AND DSNDED 500 FT BELOW ASSIGNED UNTIL CAPT CORRECTED THE SETTING.
Narrative: FLT FROM FLINT, MI, TO PITTSBURGH, PA, WE ENCOUNTERED MODERATE TURB AT FL210. WE ASKED FOR RIDE RPTS, HOWEVER WE WERE TOLD THAT WE WERE 'LEADING THE PACK.' WE REQUESTED A LOWER ALT FROM ZOB. THEY GAVE US 17000 FT. WHILE PASSING THROUGH FL180 THE ALTIMETER SETTING WAS GIVEN. DUE TO THE TURB AND RAPID DSCNT RATE THE ALTIMETER SETTING WAS NOT UNDERSTOOD EXCEPT XX.34. I, AS THE PF TUNED 30.34. AT APPROX 17300 FT MSL, THE CAPT CORRECTED THE SETTING TO 29.34. THE NEW ALTIMETER SETTING CAUSED THE ACTUAL ALT TO BE LOWER THAN THE 17000 FT SELECTED ALT CAUSING THE AUTOPLT NOT TO CAPTURE. AT 16500 FT I DISCONNECTED THE AUTOPLT AND IMMEDIATELY RETURNED TO 17000 FT. CLEVELAND THEN CLRED US TO 15000 FT AT OUR DISCRETION.
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.