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Air carrier X and cpr Y non adherence to ATC clearance. Recurrent event TCASII causes flight crew excursion from assigned altitude.
| Attributes | |
| ACN | 174509 |
| Time | |
| Date | 199104 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 3000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 174509 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Both incidents involve TCAS. Air carrier X at 11000' advised ATC of initiating climb after already climbing 400' above assigned altitude of 11000' due to TCAS alert. Traffic causing alert was 10300'. Cpr Y at 3000' issued traffic 3 or more times on same target at 2500'. Cpr Y then climbed based on TCAS instructions, west/O ATC authorization. In this case, aircraft was being shuttled under 4000' traffic in pattern for ord runway 9R approach. Unsafe condition report was also filed on 4/X/91. There is no established policy or procedure for these altitude deviations.
Original NASA ASRS Text
Title: ACR X AND CPR Y NON ADHERENCE TO ATC CLRNC. RECURRENT EVENT TCASII CAUSES FLT CREW EXCURSION FROM ASSIGNED ALT.
Narrative: BOTH INCIDENTS INVOLVE TCAS. ACR X AT 11000' ADVISED ATC OF INITIATING CLB AFTER ALREADY CLBING 400' ABOVE ASSIGNED ALT OF 11000' DUE TO TCAS ALERT. TFC CAUSING ALERT WAS 10300'. CPR Y AT 3000' ISSUED TFC 3 OR MORE TIMES ON SAME TARGET AT 2500'. CPR Y THEN CLBED BASED ON TCAS INSTRUCTIONS, W/O ATC AUTHORIZATION. IN THIS CASE, ACFT WAS BEING SHUTTLED UNDER 4000' TFC IN PATTERN FOR ORD RWY 9R APCH. UNSAFE CONDITION RPT WAS ALSO FILED ON 4/X/91. THERE IS NO ESTABLISHED POLICY OR PROC FOR THESE ALT DEVIATIONS.
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.