TCASII RA prevents potential conflict in foreign airspace. Descent to or towards occupied altitude.

Attributes
ACN	260948
Time
Date	199401
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pta
State Reference	FO
Altitude	msl bound lower : 26000 msl bound upper : 26000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mdcs
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000
ASRS Report	260948
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 30000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Cleared to FL280 by santo domingo control. While in the climb our altitude was amended to maintain FL260. While cruising at FL260 for approximately 5 mins, we picked up an aircraft at our 1 O'clock position approximately 20 NM and 2000 ft above inbound to pta fix. Aircraft was in a descent. We made visual contact about 13-15 NM. Aircraft continued descent to about 500 ft above our altitude, then began a climb. Closest point was 500 ft above and 5 NM northeast. Aircraft was transitioning from previous airway to new airway east of our position. Although we had a TCASII RA we had visual contact and no deviation was necessary. Both aircraft had TCASII warnings. Both aircraft queried santo domingo control about mutual traffic. Other aircraft was cleared by santo domingo to descend.

Original NASA ASRS Text

Title: TCASII RA PREVENTS POTENTIAL CONFLICT IN FOREIGN AIRSPACE. DSCNT TO OR TOWARDS OCCUPIED ALT.

Narrative: CLRED TO FL280 BY SANTO DOMINGO CTL. WHILE IN THE CLB OUR ALT WAS AMENDED TO MAINTAIN FL260. WHILE CRUISING AT FL260 FOR APPROX 5 MINS, WE PICKED UP AN ACFT AT OUR 1 O'CLOCK POS APPROX 20 NM AND 2000 FT ABOVE INBOUND TO PTA FIX. ACFT WAS IN A DSCNT. WE MADE VISUAL CONTACT ABOUT 13-15 NM. ACFT CONTINUED DSCNT TO ABOUT 500 FT ABOVE OUR ALT, THEN BEGAN A CLB. CLOSEST POINT WAS 500 FT ABOVE AND 5 NM NE. ACFT WAS TRANSITIONING FROM PREVIOUS AIRWAY TO NEW AIRWAY E OF OUR POS. ALTHOUGH WE HAD A TCASII RA WE HAD VISUAL CONTACT AND NO DEV WAS NECESSARY. BOTH ACFT HAD TCASII WARNINGS. BOTH ACFT QUERIED SANTO DOMINGO CTL ABOUT MUTUAL TFC. OTHER ACFT WAS CLRED BY SANTO DOMINGO TO DSND.

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.