TCASII averts a close conflict.

Attributes
ACN	241918
Time
Date	199305
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dun airport : cun
State Reference	FO
Altitude	msl bound lower : 14000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cun tower : dca
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 3500
ASRS Report	241918
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 6500 flight time type : 500
ASRS Report	241452
Events
Anomaly	conflict : airborne less severe non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were climbing en route from cancun on a 310 degree true heading, cleared to FL280. TCASII warned 'traffic' with yellow target at about 2 O'clock, 20 mi above and descending. At approximately 10 mi the TCASII commanded a 2000 FPM descent. We complied with a descent. Other traffic was in sight and cleared overhead approximately 1000 ft. TCASII reported clear of traffic. Departure control seemed unconcerned about the incident.

Original NASA ASRS Text

Title: TCASII AVERTS A CLOSE CONFLICT.

Narrative: WE WERE CLBING ENRTE FROM CANCUN ON A 310 DEG TRUE HDG, CLRED TO FL280. TCASII WARNED 'TFC' WITH YELLOW TARGET AT ABOUT 2 O'CLOCK, 20 MI ABOVE AND DSNDING. AT APPROX 10 MI THE TCASII COMMANDED A 2000 FPM DSCNT. WE COMPLIED WITH A DSCNT. OTHER TFC WAS IN SIGHT AND CLRED OVERHEAD APPROX 1000 FT. TCASII RPTED CLR OF TFC. DEP CTL SEEMED UNCONCERNED ABOUT THE INCIDENT.

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.