Air carrier X TCASII RA with parachute aircraft Y. Evasive action taken.

Attributes
ACN	267889
Time
Date	199403
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : hdf
State Reference	CA
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival star : star enroute airway : ont
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Twin Otter DHC-6
Operating Under FAR Part	Part 91
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 : 20000 flight time type : 2000
ASRS Report	267889
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure
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 : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

As PIC of air carrier X I complied with 2 simultaneous and opposing TCASII resolutions over the homeland VOR on the kayoh STAR to sna (orange county, ca). These TCASII resolutions were caused by 2 dehaviland twin otters in the process of dropping sky divers directly over the hdf VOR on this extremely busy turbojet arrival to orange county. As we passed 'clear of conflict' under both aircraft, 1 of the jump aircraft pilots stated 'air carrier X just passing through the drop zone, hold the drop.' although we did not experience a near miss because of the TCASII warning, we both feel that we were right in the middle of a near disaster. In talking with ontario approach control, I was advised that the hdf VOR is an authority/authorized drop zone, one they have tried to eliminate for yrs. Is an airline disaster with 3 aircraft, 150 passenger, 10 crew members, and 20 sky divers necessary before these drop zones are prohibited in and around these busy terminal areas?

Original NASA ASRS Text

Title: ACR X TCASII RA WITH PARACHUTE ACFT Y. EVASIVE ACTION TAKEN.

Narrative: AS PIC OF ACR X I COMPLIED WITH 2 SIMULTANEOUS AND OPPOSING TCASII RESOLUTIONS OVER THE HOMELAND VOR ON THE KAYOH STAR TO SNA (ORANGE COUNTY, CA). THESE TCASII RESOLUTIONS WERE CAUSED BY 2 DEHAVILAND TWIN OTTERS IN THE PROCESS OF DROPPING SKY DIVERS DIRECTLY OVER THE HDF VOR ON THIS EXTREMELY BUSY TURBOJET ARR TO ORANGE COUNTY. AS WE PASSED 'CLR OF CONFLICT' UNDER BOTH ACFT, 1 OF THE JUMP ACFT PLTS STATED 'ACR X JUST PASSING THROUGH THE DROP ZONE, HOLD THE DROP.' ALTHOUGH WE DID NOT EXPERIENCE A NEAR MISS BECAUSE OF THE TCASII WARNING, WE BOTH FEEL THAT WE WERE RIGHT IN THE MIDDLE OF A NEAR DISASTER. IN TALKING WITH ONTARIO APCH CTL, I WAS ADVISED THAT THE HDF VOR IS AN AUTH DROP ZONE, ONE THEY HAVE TRIED TO ELIMINATE FOR YRS. IS AN AIRLINE DISASTER WITH 3 ACFT, 150 PAX, 10 CREW MEMBERS, AND 20 SKY DIVERS NECESSARY BEFORE THESE DROP ZONES ARE PROHIBITED IN AND AROUND THESE BUSY TERMINAL AREAS?

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.