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Traffic conflict between an air carrier on ILS final and a DH6 in a high rate of descent after dropping jumpers produces a TCASII RA for the air carrier and aggressive evasive maneuvers by the DH6.
| Attributes | |
| ACN | 484991 |
| Time | |
| Date | 200009 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dab.airport |
| State Reference | FL |
| Altitude | msl single value : 2600 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dab.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 7l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : dab.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Twin Otter DHC-6 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : vacating altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : flight engineer pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 4300 flight time type : 1200 |
| ASRS Report | 484991 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other controllerb other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : took evasive action |
| Consequence | other other Other |
| Miss Distance | horizontal : 500 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Pilot Deviation |
| Situations | |
| ATC Facility | procedure or policy : dab.tracon |
Narrative:
Established on final approach at dab ILS runway 7L at 2600 ft, clearance to 1600 ft. When we got an RA 'monitor vertical speed,' I looked down at bsi to ensure I was complying with RA. Captain saw airplane approaching us, took the controls, pushed throttles forward and began climb. The other aircraft was then at our 1 O'clock position in a +60 degree angle of bank nose low position. We climbed approximately 500 ft to around 3000-3100 ft. Once the RA subsided and we felt we were safe, we began descent back to assigned altitude for uneventful landing to runway 7L. When we were safely on deck, we made an announcement to the passenger about what had just happened. The passenger seemed to be ok as they departed the aircraft. We checked the history of the engine instruments to ensure we had not exceeded the engine parameters. The N1 reached 105%. The aircraft was ferried by another crew for inspection.
Original NASA ASRS Text
Title: TFC CONFLICT BTWN AN ACR ON ILS FINAL AND A DH6 IN A HIGH RATE OF DSCNT AFTER DROPPING JUMPERS PRODUCES A TCASII RA FOR THE ACR AND AGGRESSIVE EVASIVE MANEUVERS BY THE DH6.
Narrative: ESTABLISHED ON FINAL APCH AT DAB ILS RWY 7L AT 2600 FT, CLRNC TO 1600 FT. WHEN WE GOT AN RA 'MONITOR VERT SPD,' I LOOKED DOWN AT BSI TO ENSURE I WAS COMPLYING WITH RA. CAPT SAW AIRPLANE APCHING US, TOOK THE CTLS, PUSHED THROTTLES FORWARD AND BEGAN CLB. THE OTHER ACFT WAS THEN AT OUR 1 O'CLOCK POS IN A +60 DEG ANGLE OF BANK NOSE LOW POS. WE CLBED APPROX 500 FT TO AROUND 3000-3100 FT. ONCE THE RA SUBSIDED AND WE FELT WE WERE SAFE, WE BEGAN DSCNT BACK TO ASSIGNED ALT FOR UNEVENTFUL LNDG TO RWY 7L. WHEN WE WERE SAFELY ON DECK, WE MADE AN ANNOUNCEMENT TO THE PAX ABOUT WHAT HAD JUST HAPPENED. THE PAX SEEMED TO BE OK AS THEY DEPARTED THE ACFT. WE CHKED THE HISTORY OF THE ENG INSTS TO ENSURE WE HAD NOT EXCEEDED THE ENG PARAMETERS. THE N1 REACHED 105%. THE ACFT WAS FERRIED BY ANOTHER CREW FOR INSPECTION.
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.