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Near midair collision between air carrier-small transport and GA-small aircraft that made unauthorized penetration of air traffic area.
| Attributes | |
| ACN | 84743 |
| Time | |
| Date | 198803 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : smf |
| State Reference | CA |
| Altitude | agl bound lower : 200 agl bound upper : 500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : smf tower : smf |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Route In Use | approach : visual approach : straight in |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Helicopter |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 3000 |
| ASRS Report | 84743 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | unspecified : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We, flight number xxa, were cleared for a visual approach to runway 34R OAT smf prior to reaching sac VOR, at which time sac approach began working another company aircraft with flight xxb sequencing him behind us. Other aircraft involved was an medium large transport for the left runway at our 8 O'clock (no factor) and an small aircraft Y, also being sequenced for an approach to smf. The first officer and I were planning and briefing the landing technique to be used since the winds were very strong xwinds with reports of low level windshear on final (500'). Continuing our approach straight in and coming through 500' AGL, small aircraft X xed our flight path from a low 1 O'clock to an 11 O'clock position at about 300' altitude. He at first climbed, we spotted him and diverted to the right, at which time he saw us and started his evasive action (a descent) and passed off to our left 11 O'clock position (200' miss). I proceeded to report the miss over our present frequency and then was told to contact tower. We were now at 200' AGL, 1/2 mi from runway 34R threshold. Contacted tower and received clearance for landing prior to T/D. Advised ground control of the incident. Factors: aircraft with similar callsigns, frequency congestion, no ATC handoff, heavy xwinds--approach briefing planning, crew should have initiated tower handoff, if we had been on tower frequency we might have had the traffic report, tower did not know of the small aircraft X, small aircraft X was not in communications with tower, and ag fields surround airport.
Original NASA ASRS Text
Title: NMAC BETWEEN ACR-SMT AND GA-SMA THAT MADE UNAUTH PENETRATION OF ATA.
Narrative: WE, FLT NUMBER XXA, WERE CLRED FOR A VISUAL APCH TO RWY 34R OAT SMF PRIOR TO REACHING SAC VOR, AT WHICH TIME SAC APCH BEGAN WORKING ANOTHER COMPANY ACFT WITH FLT XXB SEQUENCING HIM BEHIND US. OTHER ACFT INVOLVED WAS AN MLG FOR THE LEFT RWY AT OUR 8 O'CLOCK (NO FACTOR) AND AN SMA Y, ALSO BEING SEQUENCED FOR AN APCH TO SMF. THE F/O AND I WERE PLANNING AND BRIEFING THE LNDG TECHNIQUE TO BE USED SINCE THE WINDS WERE VERY STRONG XWINDS WITH RPTS OF LOW LEVEL WINDSHEAR ON FINAL (500'). CONTINUING OUR APCH STRAIGHT IN AND COMING THROUGH 500' AGL, SMA X XED OUR FLT PATH FROM A LOW 1 O'CLOCK TO AN 11 O'CLOCK POS AT ABOUT 300' ALT. HE AT FIRST CLBED, WE SPOTTED HIM AND DIVERTED TO THE RIGHT, AT WHICH TIME HE SAW US AND STARTED HIS EVASIVE ACTION (A DSCNT) AND PASSED OFF TO OUR LEFT 11 O'CLOCK POS (200' MISS). I PROCEEDED TO RPT THE MISS OVER OUR PRESENT FREQ AND THEN WAS TOLD TO CONTACT TWR. WE WERE NOW AT 200' AGL, 1/2 MI FROM RWY 34R THRESHOLD. CONTACTED TWR AND RECEIVED CLRNC FOR LNDG PRIOR TO T/D. ADVISED GND CTL OF THE INCIDENT. FACTORS: ACFT WITH SIMILAR CALLSIGNS, FREQ CONGESTION, NO ATC HDOF, HEAVY XWINDS--APCH BRIEFING PLANNING, CREW SHOULD HAVE INITIATED TWR HDOF, IF WE HAD BEEN ON TWR FREQ WE MIGHT HAVE HAD THE TFC RPT, TWR DID NOT KNOW OF THE SMA X, SMA X WAS NOT IN COMS WITH TWR, AND AG FIELDS SURROUND ARPT.
Data retrieved from NASA's ASRS site as of August 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.