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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier B757 takes evasive action on final approach to miss a light twin engine aircraft not on approach frequency.
| Attributes | |
| ACN | 346618 |
| Time | |
| Date | 199608 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 3500 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| 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 : 225 flight time total : 12500 flight time type : 1690 |
| ASRS Report | 346618 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 100 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We were with approach control in atl. We were given a turn to 360 degree heading and descent to 3500 ft from above 10000 ft being vectored for the ILS runway 27L at atl. As we were rolling out on heading 360 degrees we were given a slowdown to 180 KTS from 250 KTS, spoilers were deployed. All this fairly normal for this approach. WX was marginal VFR with summer fog/haze reducing visibility to approximately 3-4 mi. As we rolled to north we noticed a target on TCASII at 3500 ft and figured he was also someone on straight-in ILS to runway 27L. We were now at 3500 ft, spoilers out and slowing through 210 KTS and were looking for this target and trying to figure who and where he was. Due to the visibility situation neither of us had him as we closed to 3-4 mi. With still no tally at 2 1/2 mi we called ATC to inquire and started to climb to avoid the target. ATC came back with a calm 'suggest you climb to 4000 ft,' which at this point we were through on the way to 4500 ft. ATC: turn left to 310 degrees to intercept the ILS and you'll go slightly through the ILS. In our climb the captain saw the aircraft directly below us 200 ft. ATC said then, 'well we had him on radar, but weren't talking to him. We're gonna track him and find out where he goes to follow up.' we got no TCASII advisory due to our actions and don't know if ATC got an alert. We talked with ATC on deck, she said she'd follow it up. A question is why did she vector us to 360 degrees/3500 ft bore sighting this guy when she had him on radar but no communication? No answer on that. Did they have their alerters off in the approach area to preclude numerous alerts when issuing visuals? Without TCASII this report would not have been written it almost seems.
Original NASA ASRS Text
Title: ACR B757 TAKES EVASIVE ACTION ON FINAL APCH TO MISS A LIGHT TWIN ENG ACFT NOT ON APCH FREQ.
Narrative: WE WERE WITH APCH CTL IN ATL. WE WERE GIVEN A TURN TO 360 DEG HDG AND DSCNT TO 3500 FT FROM ABOVE 10000 FT BEING VECTORED FOR THE ILS RWY 27L AT ATL. AS WE WERE ROLLING OUT ON HDG 360 DEGS WE WERE GIVEN A SLOWDOWN TO 180 KTS FROM 250 KTS, SPOILERS WERE DEPLOYED. ALL THIS FAIRLY NORMAL FOR THIS APCH. WX WAS MARGINAL VFR WITH SUMMER FOG/HAZE REDUCING VISIBILITY TO APPROX 3-4 MI. AS WE ROLLED TO N WE NOTICED A TARGET ON TCASII AT 3500 FT AND FIGURED HE WAS ALSO SOMEONE ON STRAIGHT-IN ILS TO RWY 27L. WE WERE NOW AT 3500 FT, SPOILERS OUT AND SLOWING THROUGH 210 KTS AND WERE LOOKING FOR THIS TARGET AND TRYING TO FIGURE WHO AND WHERE HE WAS. DUE TO THE VISIBILITY SIT NEITHER OF US HAD HIM AS WE CLOSED TO 3-4 MI. WITH STILL NO TALLY AT 2 1/2 MI WE CALLED ATC TO INQUIRE AND STARTED TO CLB TO AVOID THE TARGET. ATC CAME BACK WITH A CALM 'SUGGEST YOU CLB TO 4000 FT,' WHICH AT THIS POINT WE WERE THROUGH ON THE WAY TO 4500 FT. ATC: TURN L TO 310 DEGS TO INTERCEPT THE ILS AND YOU'LL GO SLIGHTLY THROUGH THE ILS. IN OUR CLB THE CAPT SAW THE ACFT DIRECTLY BELOW US 200 FT. ATC SAID THEN, 'WELL WE HAD HIM ON RADAR, BUT WEREN'T TALKING TO HIM. WE'RE GONNA TRACK HIM AND FIND OUT WHERE HE GOES TO FOLLOW UP.' WE GOT NO TCASII ADVISORY DUE TO OUR ACTIONS AND DON'T KNOW IF ATC GOT AN ALERT. WE TALKED WITH ATC ON DECK, SHE SAID SHE'D FOLLOW IT UP. A QUESTION IS WHY DID SHE VECTOR US TO 360 DEGS/3500 FT BORE SIGHTING THIS GUY WHEN SHE HAD HIM ON RADAR BUT NO COM? NO ANSWER ON THAT. DID THEY HAVE THEIR ALERTERS OFF IN THE APCH AREA TO PRECLUDE NUMEROUS ALERTS WHEN ISSUING VISUALS? WITHOUT TCASII THIS RPT WOULD NOT HAVE BEEN WRITTEN IT ALMOST SEEMS.
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.