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During a night operation a B727 cargo flight experiences an altitude deviation when the autoplt function of altitude control was unable to keep up with the aircraft's maneuvers 12 NM from mem, tn.
| Attributes | |
| ACN | 596535 |
| Time | |
| Date | 200310 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : mem.airport |
| State Reference | TN |
| Altitude | msl bound lower : 2800 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : mem.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 35 flight time total : 6000 flight time type : 1500 |
| ASRS Report | 596535 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to original clearance flight crew : returned to assigned altitude flight crew : overrode automation flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Being vectored for ILS approach at 3000 ft MSL, given left turn for base and slowing instructions. Airplane autoplt was unable to keep up with altitude during turn and slowing and started to descend. At about 2800 ft MSL, disconnected autoplt and corrected to 3000 ft MSL. No other deviations occurred.
Original NASA ASRS Text
Title: DURING A NIGHT OP A B727 CARGO FLT EXPERIENCES AN ALTDEV WHEN THE AUTOPLT FUNCTION OF ALT CTL WAS UNABLE TO KEEP UP WITH THE ACFT'S MANEUVERS 12 NM FROM MEM, TN.
Narrative: BEING VECTORED FOR ILS APCH AT 3000 FT MSL, GIVEN L TURN FOR BASE AND SLOWING INSTRUCTIONS. AIRPLANE AUTOPLT WAS UNABLE TO KEEP UP WITH ALT DURING TURN AND SLOWING AND STARTED TO DSND. AT ABOUT 2800 FT MSL, DISCONNECTED AUTOPLT AND CORRECTED TO 3000 FT MSL. NO OTHER DEVS OCCURRED.
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.