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VFR jet ranger in IMC maneuvers on to ILS at 1000 ft AGL causing near midair collision with reporter's md-80.
| Attributes | |
| ACN | 312330 |
| Time | |
| Date | 199508 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | agl bound lower : 1000 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lga tower : lrd |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Jet Ranger Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 11800 flight time type : 4900 |
| ASRS Report | 312330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac non adherence : published procedure non adherence other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 0 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
While tracking the ILS to lga's runway 13, we received a TCASII 'traffic' warning at approximately 1300 ft AGL, our TCASII screen indicated traffic less than 2 mi ahead, 500 ft below us. Within about 20 seconds, TCASII began issuing an 'RA' on same traffic, commanding us to 'monitor vertical speed.' (TCASII was calling for us to level off). At this point, TCASII showed traffic to be at our 12:30 position and 300 ft below us, less than 1 mi ahead. We were about 1100 ft AGL. Almost immediately after above 'RA' a second 'RA' was received commanding 'climb, climb.' as I was pwring up the engines and pulling up, first officer saw a bell jet ranger diving away from us. (We were close enough to get a complete description of aircraft despite 1 3/4 mi visibility). TCASII indicated that we passed 200 ft directly overtop of bell helicopter meaning had we not have had TCASII, our md-80 would have collided with a helicopter that was operating VFR, exactly in the center of an operational ILS approach. Tower supervisor said that rotorcraft will operate VFR on procedures that underlay this approach. This particular helicopter climbed up into ILS corridor, unauthorized. Tower should have advised us to expect TCASII traffic passing below us, while on ILS. Even though we still would have had to pull up, we would have been more prepared, as no one expected to have traffic below you while doing an ILS.
Original NASA ASRS Text
Title: VFR JET RANGER IN IMC MANEUVERS ON TO ILS AT 1000 FT AGL CAUSING NMAC WITH RPTR'S MD-80.
Narrative: WHILE TRACKING THE ILS TO LGA'S RWY 13, WE RECEIVED A TCASII 'TFC' WARNING AT APPROX 1300 FT AGL, OUR TCASII SCREEN INDICATED TFC LESS THAN 2 MI AHEAD, 500 FT BELOW US. WITHIN ABOUT 20 SECONDS, TCASII BEGAN ISSUING AN 'RA' ON SAME TFC, COMMANDING US TO 'MONITOR VERT SPD.' (TCASII WAS CALLING FOR US TO LEVEL OFF). AT THIS POINT, TCASII SHOWED TFC TO BE AT OUR 12:30 POS AND 300 FT BELOW US, LESS THAN 1 MI AHEAD. WE WERE ABOUT 1100 FT AGL. ALMOST IMMEDIATELY AFTER ABOVE 'RA' A SECOND 'RA' WAS RECEIVED COMMANDING 'CLB, CLB.' AS I WAS PWRING UP THE ENGS AND PULLING UP, FO SAW A BELL JET RANGER DIVING AWAY FROM US. (WE WERE CLOSE ENOUGH TO GET A COMPLETE DESCRIPTION OF ACFT DESPITE 1 3/4 MI VISIBILITY). TCASII INDICATED THAT WE PASSED 200 FT DIRECTLY OVERTOP OF BELL HELI MEANING HAD WE NOT HAVE HAD TCASII, OUR MD-80 WOULD HAVE COLLIDED WITH A HELI THAT WAS OPERATING VFR, EXACTLY IN THE CTR OF AN OPERATIONAL ILS APCH. TWR SUPVR SAID THAT ROTORCRAFT WILL OPERATE VFR ON PROCS THAT UNDERLAY THIS APCH. THIS PARTICULAR HELI CLBED UP INTO ILS CORRIDOR, UNAUTH. TWR SHOULD HAVE ADVISED US TO EXPECT TCASII TFC PASSING BELOW US, WHILE ON ILS. EVEN THOUGH WE STILL WOULD HAVE HAD TO PULL UP, WE WOULD HAVE BEEN MORE PREPARED, AS NO ONE EXPECTED TO HAVE TFC BELOW YOU WHILE DOING AN ILS.
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.