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A DHC8-200 flight crew overshoots their assigned altitude when the autoplt was not programmed for altitude capture. Crew did not hear the 1000 ft to go chime. ZSE, wa.
| Attributes | |
| ACN | 461330 |
| Time | |
| Date | 200001 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | OR |
| Altitude | msl bound lower : 20000 msl bound upper : 20700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 120 flight time total : 5300 flight time type : 450 |
| ASRS Report | 461330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 3700 flight time type : 400 |
| ASRS Report | 461181 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : company policies non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : altitude alert -- not heard other controllera other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During intermediate leveloff, the autoplt began to capture altitude. At that moment, ATC cleared us to FL200. Upon selecting FL200 in the alerter, the aircraft resumed the climb with altitude select deselected. This was not noticed by either crew member. Upon reaching the 1000 ft to go mark (FL190), the aural tone from the alerter was not heard by either crew member. The excessive deviation alert was noted by both crew members and corrective action was taken to correct the altitude deviation. At that moment, ATC queried us for our altitude. The 1000 ft to go chime is exactly the same as the excessive deviation chime. Usually, the excessive deviation has an intermittent aural tone or something different than the 1000 ft to go chime, indicating a deviation has occurred. Corrective actions: monitor autoplt during all modes and changes to ATC clrncs.
Original NASA ASRS Text
Title: A DHC8-200 FLC OVERSHOOTS THEIR ASSIGNED ALT WHEN THE AUTOPLT WAS NOT PROGRAMMED FOR ALT CAPTURE. CREW DID NOT HEAR THE 1000 FT TO GO CHIME. ZSE, WA.
Narrative: DURING INTERMEDIATE LEVELOFF, THE AUTOPLT BEGAN TO CAPTURE ALT. AT THAT MOMENT, ATC CLRED US TO FL200. UPON SELECTING FL200 IN THE ALERTER, THE ACFT RESUMED THE CLB WITH ALT SELECT DESELECTED. THIS WAS NOT NOTICED BY EITHER CREW MEMBER. UPON REACHING THE 1000 FT TO GO MARK (FL190), THE AURAL TONE FROM THE ALERTER WAS NOT HEARD BY EITHER CREW MEMBER. THE EXCESSIVE DEV ALERT WAS NOTED BY BOTH CREW MEMBERS AND CORRECTIVE ACTION WAS TAKEN TO CORRECT THE ALTDEV. AT THAT MOMENT, ATC QUERIED US FOR OUR ALT. THE 1000 FT TO GO CHIME IS EXACTLY THE SAME AS THE EXCESSIVE DEV CHIME. USUALLY, THE EXCESSIVE DEV HAS AN INTERMITTENT AURAL TONE OR SOMETHING DIFFERENT THAN THE 1000 FT TO GO CHIME, INDICATING A DEV HAS OCCURRED. CORRECTIVE ACTIONS: MONITOR AUTOPLT DURING ALL MODES AND CHANGES TO ATC CLRNCS.
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.