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Air carrier X had near midair collision with small transport Y in TCA. Evasive action taken. System error.
| Attributes | |
| ACN | 252385 |
| Time | |
| Date | 199309 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bal |
| State Reference | MD |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bwi |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 3100 flight time type : 400 |
| ASRS Report | 252385 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 400 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X, while cruising at 9000 ft en route to phl, we were crossing over bwi VOR when the captain spotted an small transport Y at the same altitude and same direction at our 1 O'clock position. Due to the high closure speed I disconnected the autoplt and started a bank to the left and a descent to 8700 ft. At the same time the captain announced our intentions to bwi approach. We passed off the left side of small transport Y and climbed back to our altitude. When the captain asked bwi approach why he did not notify us of the traffic we were told that the small transport Y was VFR in the class 'B' airspace making a descent for 'wake turbulence,' but not to any specific altitude.
Original NASA ASRS Text
Title: ACR X HAD NMAC WITH SMT Y IN TCA. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: ACR X, WHILE CRUISING AT 9000 FT ENRTE TO PHL, WE WERE XING OVER BWI VOR WHEN THE CAPT SPOTTED AN SMT Y AT THE SAME ALT AND SAME DIRECTION AT OUR 1 O'CLOCK POS. DUE TO THE HIGH CLOSURE SPD I DISCONNECTED THE AUTOPLT AND STARTED A BANK TO THE L AND A DSCNT TO 8700 FT. AT THE SAME TIME THE CAPT ANNOUNCED OUR INTENTIONS TO BWI APCH. WE PASSED OFF THE L SIDE OF SMT Y AND CLBED BACK TO OUR ALT. WHEN THE CAPT ASKED BWI APCH WHY HE DID NOT NOTIFY US OF THE TFC WE WERE TOLD THAT THE SMT Y WAS VFR IN THE CLASS 'B' AIRSPACE MAKING A DSCNT FOR 'WAKE TURB,' BUT NOT TO ANY SPECIFIC 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.