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Confusion by crew of ATR-2 over what altitude was assigned resulted in an near midair collision with a B727.
| Attributes | |
| ACN | 519315 |
| Time | |
| Date | 200107 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | FO |
| Altitude | msl single value : 5000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : mdsd.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 17800 flight time type : 3500 |
| ASRS Report | 519315 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : nmac non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa other flight crewb other other : 4 |
| Resolutory Action | flight crew : took evasive action none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Flying at 5000 ft with opposite direction traffic at 1 O'clock position on TCASII, the traffic was first observed at +1300 ft, +1000 ft, +700 ft. At that time evasive action was initiated with a left turn and 30 degree bank angle, then next observation was very near red DOT and +300 ft. Immediately the bank angle was increased to 60 degrees and at the same time a rapid descent was initiated. Normal attitude was recuperated at 3000 ft. At that time the indication on TCASII was red DOT +100 ft and the target was right over us. ATC control explanation was, 'the ATR was cleared to 6000 ft.' the ATR pilot statement was 'he was cleared to 5000 ft.' the ATR pilot was instructed to call ATC by phone upon landing.
Original NASA ASRS Text
Title: CONFUSION BY CREW OF ATR-2 OVER WHAT ALT WAS ASSIGNED RESULTED IN AN NMAC WITH A B727.
Narrative: FLYING AT 5000 FT WITH OPPOSITE DIRECTION TFC AT 1 O'CLOCK POS ON TCASII, THE TFC WAS FIRST OBSERVED AT +1300 FT, +1000 FT, +700 FT. AT THAT TIME EVASIVE ACTION WAS INITIATED WITH A L TURN AND 30 DEG BANK ANGLE, THEN NEXT OBSERVATION WAS VERY NEAR RED DOT AND +300 FT. IMMEDIATELY THE BANK ANGLE WAS INCREASED TO 60 DEGS AND AT THE SAME TIME A RAPID DSCNT WAS INITIATED. NORMAL ATTITUDE WAS RECUPERATED AT 3000 FT. AT THAT TIME THE INDICATION ON TCASII WAS RED DOT +100 FT AND THE TARGET WAS RIGHT OVER US. ATC CTL EXPLANATION WAS, 'THE ATR WAS CLRED TO 6000 FT.' THE ATR PLT STATEMENT WAS 'HE WAS CLRED TO 5000 FT.' THE ATR PLT WAS INSTRUCTED TO CALL ATC BY PHONE UPON LNDG.
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.