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Flight crew of an light transport climbed from assigned altitude in response to a TCASII RA. Near midair collision.
| Attributes | |
| ACN | 288346 |
| Time | |
| Date | 199411 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : baf |
| State Reference | MA |
| Altitude | msl bound lower : 12000 msl bound upper : 12300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 3300 flight time type : 2300 |
| ASRS Report | 288346 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were level at 12000 ft in day -- VMC conditions. Center called traffic at 11 O'clock, 11500 ft, 10 mi. The captain and I saw the traffic on the TCASII but not usually. When the (air carrier Y) airlines beech 1900 got close-enough to us our TCASII gave us a TA. Still, no visual contact. We grew concerned when the TCASII showed the 1900 deviating from its VFR altitude of 11500 ft (climbing). Our TCASII issued a RA and ordered us to climb, we followed instructions because we still could not find the aircraft visually. Finally, at 12300 ft (I was climbing) we saw the (air carrier Y) beech 1900 very close to us. Our TCASII showed his altitude to be 11800 ft. (We had informed ATC that we were responding to a RA.) traffic passed by and I began to descend to 12000 ft -- end of conflict. Reason for near miss/conflict: the (air carrier Y) airlines beech 1900 could not hold its altitude! A 500 ft separation would have been acceptable. The 1900 'crept up' 300 ft, prompting our TCASII to issue a RA and me, as PF, to deviate from our assigned altitude.
Original NASA ASRS Text
Title: FLC OF AN LTT CLBED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA. NMAC.
Narrative: WE WERE LEVEL AT 12000 FT IN DAY -- VMC CONDITIONS. CTR CALLED TFC AT 11 O'CLOCK, 11500 FT, 10 MI. THE CAPT AND I SAW THE TFC ON THE TCASII BUT NOT USUALLY. WHEN THE (ACR Y) AIRLINES BEECH 1900 GOT CLOSE-ENOUGH TO US OUR TCASII GAVE US A TA. STILL, NO VISUAL CONTACT. WE GREW CONCERNED WHEN THE TCASII SHOWED THE 1900 DEVIATING FROM ITS VFR ALT OF 11500 FT (CLBING). OUR TCASII ISSUED A RA AND ORDERED US TO CLB, WE FOLLOWED INSTRUCTIONS BECAUSE WE STILL COULD NOT FIND THE ACFT VISUALLY. FINALLY, AT 12300 FT (I WAS CLBING) WE SAW THE (ACR Y) BEECH 1900 VERY CLOSE TO US. OUR TCASII SHOWED HIS ALT TO BE 11800 FT. (WE HAD INFORMED ATC THAT WE WERE RESPONDING TO A RA.) TFC PASSED BY AND I BEGAN TO DSND TO 12000 FT -- END OF CONFLICT. REASON FOR NEAR MISS/CONFLICT: THE (ACR Y) AIRLINES BEECH 1900 COULD NOT HOLD ITS ALT! A 500 FT SEPARATION WOULD HAVE BEEN ACCEPTABLE. THE 1900 'CREPT UP' 300 FT, PROMPTING OUR TCASII TO ISSUE A RA AND ME, AS PF, TO DEVIATE FROM OUR ASSIGNED ALT.
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.