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Ord S80 arrival descends below assigned altitude. Approach clearance canceled, aircraft missed parallel localizer turn on.
| Attributes | |
| ACN | 572985 |
| Time | |
| Date | 200301 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : c90.tracon |
| State Reference | IL |
| Altitude | msl bound lower : 4700 msl bound upper : 5000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 27l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| ASRS Report | 572985 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 573139 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : separated traffic controller : issued new clearance flight crew : returned to assigned altitude flight crew : returned to intended or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Level at 11000 ft MSL and 320 KIAS assigned, approach control requested a rapid deceleration to 250 KIAS. Speed select was placed to 250 KTS and throttles retarded to idle. As plane slowed, indicated airspeed was selected to place throttles in clamp and speed rotated to 250 KTS. Aircraft started slight descent from altitude hold and was noticed at approximately 10700 ft MSL. Autoplt was disconnected and aircraft returned to 11000 ft MSL. Approach control requested we check altitude as he noted 300 ft low. Autoplt was reconnected and approach continued. On final approach, we were cleared from 5000 ft to 4000 ft and cleared the ILS runway 27L approach. At 4700 ft, approach clearance canceled and we were requested to return to 5000 ft due to another aircraft passing through the localizer on a parallel approach. We were subsequently cleared for the approach without further incident.
Original NASA ASRS Text
Title: ORD S80 ARR DSNDS BELOW ASSIGNED ALT. APCH CLRNC CANCELED, ACFT MISSED PARALLEL LOC TURN ON.
Narrative: LEVEL AT 11000 FT MSL AND 320 KIAS ASSIGNED, APCH CTL REQUESTED A RAPID DECELERATION TO 250 KIAS. SPD SELECT WAS PLACED TO 250 KTS AND THROTTLES RETARDED TO IDLE. AS PLANE SLOWED, INDICATED AIRSPD WAS SELECTED TO PLACE THROTTLES IN CLAMP AND SPD ROTATED TO 250 KTS. ACFT STARTED SLIGHT DSCNT FROM ALT HOLD AND WAS NOTICED AT APPROX 10700 FT MSL. AUTOPLT WAS DISCONNECTED AND ACFT RETURNED TO 11000 FT MSL. APCH CTL REQUESTED WE CHK ALT AS HE NOTED 300 FT LOW. AUTOPLT WAS RECONNECTED AND APCH CONTINUED. ON FINAL APCH, WE WERE CLRED FROM 5000 FT TO 4000 FT AND CLRED THE ILS RWY 27L APCH. AT 4700 FT, APCH CLRNC CANCELED AND WE WERE REQUESTED TO RETURN TO 5000 FT DUE TO ANOTHER ACFT PASSING THROUGH THE LOC ON A PARALLEL APCH. WE WERE SUBSEQUENTLY CLRED FOR THE APCH WITHOUT FURTHER INCIDENT.
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.