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Air carrier flight crew initiate TCASII climb in apparent response to traffic, as advised by ZAU, 4000 ft below on same route.
| Attributes | |
| ACN | 499450 |
| Time | |
| Date | 200101 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : iow.vortac |
| State Reference | IA |
| Altitude | msl bound lower : 39000 msl bound upper : 39300 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j60.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j60.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 499450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
TCASII climb RA at FL390. Followed RA to FL393 and returned to cruise altitude within 30 seconds of deviation. Advised ZAU. Noted red symbol right below us on map. Center advised only traffic was an aircraft immediately below us at FL350. Only TCASII indication and commands were 'climb' then a softening to 'monitor vertical speed' with appropriate pitch indications on the ADI. No 'traffic' callout with appropriate symbol preceded the RA and no 'clear of conflict' annunciated. All RA guidance followed within appropriate time limits. Not sure if frequency listed was correct for position along J60, 80E, iow.
Original NASA ASRS Text
Title: ACR FLC INITIATE TCASII CLB IN APPARENT RESPONSE TO TFC, AS ADVISED BY ZAU, 4000 FT BELOW ON SAME RTE.
Narrative: TCASII CLB RA AT FL390. FOLLOWED RA TO FL393 AND RETURNED TO CRUISE ALT WITHIN 30 SECONDS OF DEV. ADVISED ZAU. NOTED RED SYMBOL RIGHT BELOW US ON MAP. CTR ADVISED ONLY TFC WAS AN ACFT IMMEDIATELY BELOW US AT FL350. ONLY TCASII INDICATION AND COMMANDS WERE 'CLB' THEN A SOFTENING TO 'MONITOR VERT SPD' WITH APPROPRIATE PITCH INDICATIONS ON THE ADI. NO 'TFC' CALLOUT WITH APPROPRIATE SYMBOL PRECEDED THE RA AND NO 'CLR OF CONFLICT' ANNUNCIATED. ALL RA GUIDANCE FOLLOWED WITHIN APPROPRIATE TIME LIMITS. NOT SURE IF FREQ LISTED WAS CORRECT FOR POS ALONG J60, 80E, IOW.
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.