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DC10 crew overshot their assigned altitude in descent when the first officer, PF, activated the autoplt vertical speed control wheel, thereby disconnecting the autoplt's altitude automatic capture feature. First officer was new to DC10 operation. The so alerted the rest of crew to the overshoot.
| Attributes | |
| ACN | 371330 |
| Time | |
| Date | 199706 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bdf |
| State Reference | IL |
| Altitude | msl bound lower : 32300 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 500 |
| ASRS Report | 371330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure |
| 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:
Center cleared aircraft from FL370 to FL330. First officer flying, and this was his first flight after IOE. I, captain, was looking at the arrival plate during descent (BDF3). We descended to FL323 before the flight engineer called altitude. I had set and armed FL330, called the setting and the first officer had acknowledged the setting as per company policy. I believe the first officer moved the vertical speed wheel after altitude capture was annunciated, which on the DC10 removes altitude protection in autoplt mode. The center said nothing, and we quickly climbed back to FL330. I do not believe the altitude transgression was unobserved.
Original NASA ASRS Text
Title: DC10 CREW OVERSHOT THEIR ASSIGNED ALT IN DSCNT WHEN THE FO, PF, ACTIVATED THE AUTOPLT VERT SPD CTL WHEEL, THEREBY DISCONNECTING THE AUTOPLT'S ALT AUTO CAPTURE FEATURE. FO WAS NEW TO DC10 OP. THE SO ALERTED THE REST OF CREW TO THE OVERSHOOT.
Narrative: CTR CLRED ACFT FROM FL370 TO FL330. FO FLYING, AND THIS WAS HIS FIRST FLT AFTER IOE. I, CAPT, WAS LOOKING AT THE ARR PLATE DURING DSCNT (BDF3). WE DSNDED TO FL323 BEFORE THE FE CALLED ALT. I HAD SET AND ARMED FL330, CALLED THE SETTING AND THE FO HAD ACKNOWLEDGED THE SETTING AS PER COMPANY POLICY. I BELIEVE THE FO MOVED THE VERT SPD WHEEL AFTER ALT CAPTURE WAS ANNUNCIATED, WHICH ON THE DC10 REMOVES ALT PROTECTION IN AUTOPLT MODE. THE CTR SAID NOTHING, AND WE QUICKLY CLBED BACK TO FL330. I DO NOT BELIEVE THE ALT TRANSGRESSION WAS UNOBSERVED.
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.