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When the autoplt failed to capture the assigned altitude on an approach, a DC10 flight crew attempted to correct the situation by selecting the altitude hold. When the altitude hold failed to stop the descent, the flight crew then switched to manual flight, but were now 400 ft below the assigned altitude.
| Attributes | |
| ACN | 334290 |
| Time | |
| Date | 199604 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : san |
| State Reference | CA |
| Altitude | msl bound lower : 1600 msl bound upper : 2000 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : san |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 334290 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| 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:
On descent to 2000 ft to cross reebo on localizer runway 27 at san, the autoplt did not capture altitude. Manually selecting altitude hold did not stop descent. Autoplt was punched off, descent was stopped at 1600 ft, and we climbed back to 2000 ft. WX was VFR. No safety problem.
Original NASA ASRS Text
Title: WHEN THE AUTOPLT FAILED TO CAPTURE THE ASSIGNED ALT ON AN APCH, A DC10 FLC ATTEMPTED TO CORRECT THE SIT BY SELECTING THE ALT HOLD. WHEN THE ALT HOLD FAILED TO STOP THE DSCNT, THE FLC THEN SWITCHED TO MANUAL FLT, BUT WERE NOW 400 FT BELOW THE ASSIGNED ALT.
Narrative: ON DSCNT TO 2000 FT TO CROSS REEBO ON LOC RWY 27 AT SAN, THE AUTOPLT DID NOT CAPTURE ALT. MANUALLY SELECTING ALT HOLD DID NOT STOP DSCNT. AUTOPLT WAS PUNCHED OFF, DSCNT WAS STOPPED AT 1600 FT, AND WE CLBED BACK TO 2000 FT. WX WAS VFR. NO SAFETY PROB.
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.