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Air carrier Y TCASII RA stopped climb, had less than standard separation from air carrier X. Pilot deviation. TCASII induced less than standard separation.
| Attributes | |
| ACN | 241002 |
| Time | |
| Date | 199305 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mzv |
| State Reference | IL |
| Altitude | msl bound lower : 24000 msl bound upper : 24600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| ASRS Report | 241002 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental |
| ASRS Report | 241001 |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While working iow city radar sector with a trainee, I observed cpr X about 30 mi northeast mzv nebound at FL235 climbing. I issued a clearance to cpr X to maintain FL240 and then told air carrier Y to expedite out of FL250. Air carrier Y then told me he was responding to a TCASII RA. He did not say if he was climbing or descending. I then told air carrier Y to maintain FL250. Air carrier Y then asked about traffic if I showed it on my scope. I told air carrier Y that cpr X was level at FL240 and I questioned him about his RA. He said that TCASII told him to descend, then level, then climb. Supplemental information from acn 241001: air carrier Y cleared to FL310. Cpr X cleared to FL270. Air carrier Y levels at FL246 for TCASII alert.
Original NASA ASRS Text
Title: ACR Y TCASII RA STOPPED CLB, HAD LTSS FROM ACR X. PLTDEV. TCASII INDUCED LTSS.
Narrative: WHILE WORKING IOW CITY RADAR SECTOR WITH A TRAINEE, I OBSERVED CPR X ABOUT 30 MI NE MZV NEBOUND AT FL235 CLBING. I ISSUED A CLRNC TO CPR X TO MAINTAIN FL240 AND THEN TOLD ACR Y TO EXPEDITE OUT OF FL250. ACR Y THEN TOLD ME HE WAS RESPONDING TO A TCASII RA. HE DID NOT SAY IF HE WAS CLBING OR DSNDING. I THEN TOLD ACR Y TO MAINTAIN FL250. ACR Y THEN ASKED ABOUT TFC IF I SHOWED IT ON MY SCOPE. I TOLD ACR Y THAT CPR X WAS LEVEL AT FL240 AND I QUESTIONED HIM ABOUT HIS RA. HE SAID THAT TCASII TOLD HIM TO DSND, THEN LEVEL, THEN CLB. SUPPLEMENTAL INFORMATION FROM ACN 241001: ACR Y CLRED TO FL310. CPR X CLRED TO FL270. ACR Y LEVELS AT FL246 FOR TCASII ALERT.
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.