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A military aircraft commander engaged his autoplt in order to capture FL260, but his altitude overshot by 100 ft. He claimed that his autoplt always overshoots when climbing at an increased rate.
| Attributes | |
| ACN | 457390 |
| Time | |
| Date | 199912 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zhu.artcc |
| State Reference | TX |
| Altitude | msl bound lower : 26000 msl bound upper : 26100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | other |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zhu.artcc |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | government : military |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 70 flight time total : 6500 flight time type : 2000 |
| ASRS Report | 457390 |
| Person 2 | |
| Affiliation | government : military |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : ground less severe non adherence : clearance non adherence : far non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude none taken : anomaly accepted none taken : detected after the fact |
| Miss Distance | horizontal : 0 vertical : 900 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During climb to FL290, ATC advised of traffic and adjusted speed. Passing FL250, ATC requested leveloff at FL260, due to traffic. Altitude was adjusted and leveloff began while approaching FL260. Autoplt was engaged and aircraft overshot altitude by approximately 100 ft to FL261. This is normal for this autoplt when capturing with increased rate of climb/descent. As aircraft was correcting to altitude, the TA, traffic alert, was displayed showing 800 ft separation vertically. Autoplt was disconnected to expedite correction to FL260. After leveling at FL260, TCASII still showed 800 ft separation. TCASII RA commanded descend and altitude was decreased to approximately FL258. When 'clear of conflict' alert announced, traffic was acquired visually.
Original NASA ASRS Text
Title: A MIL ACFT COMMANDER ENGAGED HIS AUTOPLT IN ORDER TO CAPTURE FL260, BUT HIS ALT OVERSHOT BY 100 FT. HE CLAIMED THAT HIS AUTOPLT ALWAYS OVERSHOOTS WHEN CLBING AT AN INCREASED RATE.
Narrative: DURING CLB TO FL290, ATC ADVISED OF TFC AND ADJUSTED SPD. PASSING FL250, ATC REQUESTED LEVELOFF AT FL260, DUE TO TFC. ALT WAS ADJUSTED AND LEVELOFF BEGAN WHILE APCHING FL260. AUTOPLT WAS ENGAGED AND ACFT OVERSHOT ALT BY APPROX 100 FT TO FL261. THIS IS NORMAL FOR THIS AUTOPLT WHEN CAPTURING WITH INCREASED RATE OF CLB/DSCNT. AS ACFT WAS CORRECTING TO ALT, THE TA, TFC ALERT, WAS DISPLAYED SHOWING 800 FT SEPARATION VERTLY. AUTOPLT WAS DISCONNECTED TO EXPEDITE CORRECTION TO FL260. AFTER LEVELING AT FL260, TCASII STILL SHOWED 800 FT SEPARATION. TCASII RA COMMANDED DSND AND ALT WAS DECREASED TO APPROX FL258. WHEN 'CLR OF CONFLICT' ALERT ANNOUNCED, TFC WAS ACQUIRED VISUALLY.
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.