Near midair collision between arriving atx-light transport and departing air carrier-large transport...

Attributes
ACN	91822
Time
Date	198807
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cdo airport : mdsd
State Reference	FO
Altitude	msl bound lower : 5500 msl bound upper : 5500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mdcs tracon : mdsd
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Route In Use	enroute airway : w2
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 75 flight time total : 9000 flight time type : 4000
ASRS Report	91822
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Primary Problem	Ambiguous

Narrative:

While on IMC descent, non radar on W-2 arwy to cdo VOR at santo domingo, dominican republic, we were in a rain shower and given a crossing restriction of 5000' at 13 DME on the 004 degree right (184 course). Just passing 5500' at 15 DME we came totally clear of all rain when from 11:30 position I sighted an aircraft. I had the copilot flying this leg and commanding a slight right turn of 15 degrees. With this change the large transport passed in a parallel course directly off our left wing with little or no vertical sep and approximately 500' estimated latitude sep. I think I heard the call sign of the large transport as xyz, or something similar. It did have dark blue horizontal strips. Since we were in a non radar environment and now VFR with santo domingo airport in sight, I believe I did state to santo domingo control that I had aircraft in sight. He may have noted it and had us go soon after to tower frequency. There was no communication or indication from the large transport to indicate he was aware of a near miss. I broke no regulations that I'm aware of. This form is submitted for filing only to record this instance of a near miss. After talking to several people (local), I'm told the FAA is looking at mdsd airport re: problems of air traffic flow, etc. This seems to be breakdown of control procedures.

Original NASA ASRS Text

Title: NMAC BETWEEN ARRIVING ATX-LTT AND DEPARTING ACR-LGT.

Narrative: WHILE ON IMC DSCNT, NON RADAR ON W-2 ARWY TO CDO VOR AT SANTO DOMINGO, DOMINICAN REPUBLIC, WE WERE IN A RAIN SHOWER AND GIVEN A XING RESTRICTION OF 5000' AT 13 DME ON THE 004 DEG R (184 COURSE). JUST PASSING 5500' AT 15 DME WE CAME TOTALLY CLEAR OF ALL RAIN WHEN FROM 11:30 POS I SIGHTED AN ACFT. I HAD THE COPLT FLYING THIS LEG AND COMMANDING A SLIGHT RIGHT TURN OF 15 DEGS. WITH THIS CHANGE THE LGT PASSED IN A PARALLEL COURSE DIRECTLY OFF OUR LEFT WING WITH LITTLE OR NO VERT SEP AND APPROX 500' ESTIMATED LAT SEP. I THINK I HEARD THE CALL SIGN OF THE LGT AS XYZ, OR SOMETHING SIMILAR. IT DID HAVE DARK BLUE HORIZ STRIPS. SINCE WE WERE IN A NON RADAR ENVIRONMENT AND NOW VFR WITH SANTO DOMINGO ARPT IN SIGHT, I BELIEVE I DID STATE TO SANTO DOMINGO CTL THAT I HAD ACFT IN SIGHT. HE MAY HAVE NOTED IT AND HAD US GO SOON AFTER TO TWR FREQ. THERE WAS NO COM OR INDICATION FROM THE LGT TO INDICATE HE WAS AWARE OF A NEAR MISS. I BROKE NO REGS THAT I'M AWARE OF. THIS FORM IS SUBMITTED FOR FILING ONLY TO RECORD THIS INSTANCE OF A NEAR MISS. AFTER TALKING TO SEVERAL PEOPLE (LCL), I'M TOLD THE FAA IS LOOKING AT MDSD ARPT RE: PROBS OF AIR TFC FLOW, ETC. THIS SEEMS TO BE BREAKDOWN OF CTL PROCS.

Data retrieved from NASA's ASRS site as of August 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.