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Flight crew of a dornier 328, DO328, descended from assigned cruise altitude in response to a TCASII RA caused by an embraer 145, EMB145, descending through assigned altitude.
| Attributes | |
| ACN | 430663 |
| Time | |
| Date | 199903 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : fqm.vor |
| State Reference | PA |
| Altitude | msl bound lower : 24300 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Embraer Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 181 flight time total : 15900 flight time type : 3440 |
| ASRS Report | 430663 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : took precautionary avoidance action |
| Miss Distance | horizontal : 1000 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Level at FL250 and direct to fqm. TCASII went off with 'traffic' followed by (within 2 seconds) 'descend.' followed RA instruction and as we were descending there was traffic at 10-11 O'clock position. The conflicting traffic was on another center frequency so we did not hear him. They might have been in a descent and we believe they went through their assigned altitude. Our altitude separation was 700 ft at the beginning and ended at 300 ft. Then within 5-7 seconds we were 1000 ft separation. We notified ATC of our RA instructions and they told us after the fact that we had traffic at FL260.
Original NASA ASRS Text
Title: FLC OF A DORNIER 328, DO328, DSNDED FROM ASSIGNED CRUISE ALT IN RESPONSE TO A TCASII RA CAUSED BY AN EMBRAER 145, EMB145, DSNDING THROUGH ASSIGNED ALT.
Narrative: LEVEL AT FL250 AND DIRECT TO FQM. TCASII WENT OFF WITH 'TFC' FOLLOWED BY (WITHIN 2 SECONDS) 'DSND.' FOLLOWED RA INSTRUCTION AND AS WE WERE DSNDING THERE WAS TFC AT 10-11 O'CLOCK POS. THE CONFLICTING TFC WAS ON ANOTHER CTR FREQ SO WE DID NOT HEAR HIM. THEY MIGHT HAVE BEEN IN A DSCNT AND WE BELIEVE THEY WENT THROUGH THEIR ASSIGNED ALT. OUR ALT SEPARATION WAS 700 FT AT THE BEGINNING AND ENDED AT 300 FT. THEN WITHIN 5-7 SECONDS WE WERE 1000 FT SEPARATION. WE NOTIFIED ATC OF OUR RA INSTRUCTIONS AND THEY TOLD US AFTER THE FACT THAT WE HAD TFC AT FL260.
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.