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Flight crew of B757 is advised of traffic, a flight of 2 cessnas, at 12:30 O'clock position 'but if you stay on glide path it will be no problem.' it was a problem and TCASII activated resulting in a dive by reporter aircraft.
| Attributes | |
| ACN | 400303 |
| Time | |
| Date | 199804 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 7500 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : las tracon : chs |
| 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 : straight in |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Aircraft Undifferentiated or Other Model |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 6000 flight time type : 320 |
| ASRS Report | 400303 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 5500 vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
We were told of a flight of 2 cessnas at 12:30 O'clock position X mi and 7500 ft, 'if you stay on the GS you won't have any problem.' we did have a problem. Passing 7700 ft the cessna lead called us in sight but did not maneuver to clear. TCASII went berserk and would have pulled us right back into their path. We picked up the visual and dove below the glide path to avoid conflict. It would seem to me if I'm flying a cessna, with my wingman on the conflict side, anywhere near the turbulence of a B757 I'd maneuver well away. Once we intercepted course and GS near crowe intersection, at no time did we deviate above glide path. I think the controller's intentions were good but given the quality of their equipment I can see the problems. However, had there been marginal visibility this could have been for worse.
Original NASA ASRS Text
Title: FLC OF B757 IS ADVISED OF TFC, A FLT OF 2 CESSNAS, AT 12:30 O'CLOCK POS 'BUT IF YOU STAY ON GLIDE PATH IT WILL BE NO PROB.' IT WAS A PROB AND TCASII ACTIVATED RESULTING IN A DIVE BY RPTR ACFT.
Narrative: WE WERE TOLD OF A FLT OF 2 CESSNAS AT 12:30 O'CLOCK POS X MI AND 7500 FT, 'IF YOU STAY ON THE GS YOU WON'T HAVE ANY PROB.' WE DID HAVE A PROB. PASSING 7700 FT THE CESSNA LEAD CALLED US IN SIGHT BUT DID NOT MANEUVER TO CLR. TCASII WENT BERSERK AND WOULD HAVE PULLED US RIGHT BACK INTO THEIR PATH. WE PICKED UP THE VISUAL AND DOVE BELOW THE GLIDE PATH TO AVOID CONFLICT. IT WOULD SEEM TO ME IF I'M FLYING A CESSNA, WITH MY WINGMAN ON THE CONFLICT SIDE, ANYWHERE NEAR THE TURB OF A B757 I'D MANEUVER WELL AWAY. ONCE WE INTERCEPTED COURSE AND GS NEAR CROWE INTXN, AT NO TIME DID WE DEVIATE ABOVE GLIDE PATH. I THINK THE CTLR'S INTENTIONS WERE GOOD BUT GIVEN THE QUALITY OF THEIR EQUIP I CAN SEE THE PROBS. HOWEVER, HAD THERE BEEN MARGINAL VISIBILITY THIS COULD HAVE BEEN FOR WORSE.
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.