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Flight crew of an medium large transport descended below assigned altitude during vectors for approach in response to a TCASII RA. Subsequently, they overshot their assigned altitude when climbing back.
| Attributes | |
| ACN | 323320 |
| Time | |
| Date | 199512 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dxo airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 4600 msl bound upper : 5300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw tracon : slc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 18600 flight time type : 9500 |
| ASRS Report | 323320 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were on radar vectors for an ILS approach runway 21L dtw. We received a RA from TCASII to descend. We started to descend and at 4600 ft we were clear of conflict. I advised ATC of our TCASII alert and were descending. ATC acknowledged our descent and advised us that the conflict traffic had us in sight. While climbing back to our assigned altitude, the autoplt did not level off at the assigned altitude and overshot by 300 ft.
Original NASA ASRS Text
Title: FLC OF AN MLG DSNDED BELOW ASSIGNED ALT DURING VECTORS FOR APCH IN RESPONSE TO A TCASII RA. SUBSEQUENTLY, THEY OVERSHOT THEIR ASSIGNED ALT WHEN CLBING BACK.
Narrative: WE WERE ON RADAR VECTORS FOR AN ILS APCH RWY 21L DTW. WE RECEIVED A RA FROM TCASII TO DSND. WE STARTED TO DSND AND AT 4600 FT WE WERE CLR OF CONFLICT. I ADVISED ATC OF OUR TCASII ALERT AND WERE DSNDING. ATC ACKNOWLEDGED OUR DSCNT AND ADVISED US THAT THE CONFLICT TFC HAD US IN SIGHT. WHILE CLBING BACK TO OUR ASSIGNED ALT, THE AUTOPLT DID NOT LEVEL OFF AT THE ASSIGNED ALT AND OVERSHOT BY 300 FT.
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.