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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Pilot deviation less than standard separation occurred when CL61 at FL220 received TCASII RA to descend and reported to ATC. Controller reported only traffic was at FL210 (MU2). CL61 subsequently received command to climb. The MU2's mode C indicated level at FL210 for the entire time.
| Attributes | |
| ACN | 346410 |
| Time | |
| Date | 199609 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 21600 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : tys |
| Operator | general aviation : corporate |
| Make Model Name | Challenger Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | MU-2 Undifferentiated or Other Model |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 1 controller radar : 10 |
| ASRS Report | 346410 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : required legal separation other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 17400 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
A T/CL61/right was wbound, level at FL220, approaching pullman VORTAC. At XX38Z, pilot reported receiving an RA from TCASII. I advised pilot that the only traffic was level at FL210, about to pass off his left by about 1 mi. He then stated that the RA was to descend, and his mode C showed FL216. I advised the pilot to return to FL220 when able. The oedp activated, indicating loss of separation (2.9 NM, 600 ft). The pilot subsequently stated that after responding to the descent RA, he received a new RA to climb, to avoid the traffic at FL210. Notes: my radar indicated no other traffic in the vicinity between FL188-FL352. The other aircraft's(MU2) mode C was reporting level at FL210 the entire time. ZAU quality assurance is processing as a pilot deviation. I don't believe that there was danger of collision. I don't know of any reason for a descent RA.
Original NASA ASRS Text
Title: PLTDEV LTSS OCCURRED WHEN CL61 AT FL220 RECEIVED TCASII RA TO DSND AND RPTED TO ATC. CTLR RPTED ONLY TFC WAS AT FL210 (MU2). CL61 SUBSEQUENTLY RECEIVED COMMAND TO CLB. THE MU2'S MODE C INDICATED LEVEL AT FL210 FOR THE ENTIRE TIME.
Narrative: A T/CL61/R WAS WBOUND, LEVEL AT FL220, APCHING PULLMAN VORTAC. AT XX38Z, PLT RPTED RECEIVING AN RA FROM TCASII. I ADVISED PLT THAT THE ONLY TFC WAS LEVEL AT FL210, ABOUT TO PASS OFF HIS L BY ABOUT 1 MI. HE THEN STATED THAT THE RA WAS TO DSND, AND HIS MODE C SHOWED FL216. I ADVISED THE PLT TO RETURN TO FL220 WHEN ABLE. THE OEDP ACTIVATED, INDICATING LOSS OF SEPARATION (2.9 NM, 600 FT). THE PLT SUBSEQUENTLY STATED THAT AFTER RESPONDING TO THE DSCNT RA, HE RECEIVED A NEW RA TO CLB, TO AVOID THE TFC AT FL210. NOTES: MY RADAR INDICATED NO OTHER TFC IN THE VICINITY BTWN FL188-FL352. THE OTHER ACFT'S(MU2) MODE C WAS RPTING LEVEL AT FL210 THE ENTIRE TIME. ZAU QUALITY ASSURANCE IS PROCESSING AS A PLTDEV. I DON'T BELIEVE THAT THERE WAS DANGER OF COLLISION. I DON'T KNOW OF ANY REASON FOR A DSCNT RA.
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.