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Altitude deviation during descent. Expected autoplt to level at assigned altitude, but aircraft continued descent to 300 ft low. Possible altimeter error.
| Attributes | |
| ACN | 327990 |
| Time | |
| Date | 199602 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 5700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : cfi pilot : atp pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 170 flight time total : 10000 flight time type : 500 |
| ASRS Report | 327990 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 300 |
| ASRS Report | 328302 |
| 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 approach into dtw the aircraft was descending at a low rate to level off at 6000 ft. Thought the autoplt was holding us level at 6000 ft, then noticed we were approximately 300 ft below our assigned altitude. Both the first officer and myself noticed at about the same time. We immediately returned to our assigned altitude. No conflict was noted and no aircraft appeared on the TCASII.
Original NASA ASRS Text
Title: ALTDEV DURING DSCNT. EXPECTED AUTOPLT TO LEVEL AT ASSIGNED ALT, BUT ACFT CONTINUED DSCNT TO 300 FT LOW. POSSIBLE ALTIMETER ERROR.
Narrative: ON APCH INTO DTW THE ACFT WAS DSNDING AT A LOW RATE TO LEVEL OFF AT 6000 FT. THOUGHT THE AUTOPLT WAS HOLDING US LEVEL AT 6000 FT, THEN NOTICED WE WERE APPROX 300 FT BELOW OUR ASSIGNED ALT. BOTH THE FO AND MYSELF NOTICED AT ABOUT THE SAME TIME. WE IMMEDIATELY RETURNED TO OUR ASSIGNED ALT. NO CONFLICT WAS NOTED AND NO ACFT APPEARED ON THE TCASII.
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.