An air carrier light transport crew climbed in response to a TCASII command.

Attributes
ACN	229401
Time
Date	199212
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 10700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : crg
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : zma
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6500 flight time type : 900
ASRS Report	229401
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 2400 flight time type : 760
ASRS Report	229601
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Center advised us of traffic at 10 O'clock. In the same time, or a little thereafter, the TCASII gave a TA. No traffic could be spotted. ATC was advised of no contact. In the meantime, the controller gave us a frequency change. While in the frequency change process, the TCASII gave an RA to climb at 2500 FPM. The RA was followed (first officer flying). In the climb to avoid the traffic, the traffic was spotted less than 1 mi and less than 500 ft. At about 10700 ft, the TCASII announced clear of traffic. The target was now no longer a factor. The aircraft was returned to the initial altitude. The new controller was contacted and advised of the situation in progress. He did not seem to be aware of the situation and did not appear to understand what could have happened -- hadn't we taken evasive action. The TCASII worked as advertised, the crew followed the alert. Without the TCASII warning, the outcome of this would have been very dramatic. There was no need of a frequency change after a traffic call.

Original NASA ASRS Text

Title: AN ACR LTT CREW CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: CTR ADVISED US OF TFC AT 10 O'CLOCK. IN THE SAME TIME, OR A LITTLE THEREAFTER, THE TCASII GAVE A TA. NO TFC COULD BE SPOTTED. ATC WAS ADVISED OF NO CONTACT. IN THE MEANTIME, THE CTLR GAVE US A FREQ CHANGE. WHILE IN THE FREQ CHANGE PROCESS, THE TCASII GAVE AN RA TO CLB AT 2500 FPM. THE RA WAS FOLLOWED (FO FLYING). IN THE CLB TO AVOID THE TFC, THE TFC WAS SPOTTED LESS THAN 1 MI AND LESS THAN 500 FT. AT ABOUT 10700 FT, THE TCASII ANNOUNCED CLR OF TFC. THE TARGET WAS NOW NO LONGER A FACTOR. THE ACFT WAS RETURNED TO THE INITIAL ALT. THE NEW CTLR WAS CONTACTED AND ADVISED OF THE SIT IN PROGRESS. HE DID NOT SEEM TO BE AWARE OF THE SIT AND DID NOT APPEAR TO UNDERSTAND WHAT COULD HAVE HAPPENED -- HADN'T WE TAKEN EVASIVE ACTION. THE TCASII WORKED AS ADVERTISED, THE CREW FOLLOWED THE ALERT. WITHOUT THE TCASII WARNING, THE OUTCOME OF THIS WOULD HAVE BEEN VERY DRAMATIC. THERE WAS NO NEED OF A FREQ CHANGE AFTER A TFC CALL.

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.