A descending atx jet sets off an SF340's TCASII when it passes through the SF340's altitude. The atx was on a visual separation descent, 4 mi from the SF340.

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Attributes
ACN	416520
Time
Date	199810
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cuu
State Reference	FO
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cuu
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 3500 flight time type : 2000
ASRS Report	416520
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

On descent into mmcu I was cleared to 10000 ft MSL. ATC pointed out traffic at our 1 O'clock position and 9000 ft. We said that we had the traffic in sight. The controller then said that we could descend with visual separation with the traffic. We estimated the position of the traffic to be about 4 SM away. As we descended through his altitude, he reported that his TCASII gave him an RA. I did not give this much concern because I thought he was under the knowledge that I was operating on visual separation standards. I think that the language barrier (I was speaking english and the saab, spanish) and ATC's failure to notify the saab crew of our position and intentions contributed to the confusion.

Original NASA ASRS Text

Title: A DSNDING ATX JET SETS OFF AN SF340'S TCASII WHEN IT PASSES THROUGH THE SF340'S ALT. THE ATX WAS ON A VISUAL SEPARATION DSCNT, 4 MI FROM THE SF340.

Narrative: ON DSCNT INTO MMCU I WAS CLRED TO 10000 FT MSL. ATC POINTED OUT TFC AT OUR 1 O'CLOCK POS AND 9000 FT. WE SAID THAT WE HAD THE TFC IN SIGHT. THE CTLR THEN SAID THAT WE COULD DSND WITH VISUAL SEPARATION WITH THE TFC. WE ESTIMATED THE POS OF THE TFC TO BE ABOUT 4 SM AWAY. AS WE DSNDED THROUGH HIS ALT, HE RPTED THAT HIS TCASII GAVE HIM AN RA. I DID NOT GIVE THIS MUCH CONCERN BECAUSE I THOUGHT HE WAS UNDER THE KNOWLEDGE THAT I WAS OPERATING ON VISUAL SEPARATION STANDARDS. I THINK THAT THE LANGUAGE BARRIER (I WAS SPEAKING ENGLISH AND THE SAAB, SPANISH) AND ATC'S FAILURE TO NOTIFY THE SAAB CREW OF OUR POS AND INTENTIONS CONTRIBUTED TO THE CONFUSION.

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.