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

Attributes
ACN	255855
Time
Date	199311
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : blh
State Reference	CA
Altitude	msl bound lower : 37000 msl bound upper : 37400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 17000 flight time type : 1000
ASRS Report	255855
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 2000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII TA 'traffic, traffic' followed by RA 'climb, climb' and vertical guidance to climb at 2000 FPM. This was accomplished and resulted in an altitude deviation of plus 400 ft to 37400 ft. Before TCASII advised 'clear of traffic,' ATC controller was advised and he told us traffic was an fgt climbing to FL350. ATC did not advise of traffic prior to our inquiry. The conflicting traffic was visually acquired after the initial TCASII advisory and I felt the guidance was appropriate. The fgt must have had a very high rate of climb to trigger TCASII.

Original NASA ASRS Text

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

Narrative: TCASII TA 'TFC, TFC' FOLLOWED BY RA 'CLB, CLB' AND VERT GUIDANCE TO CLB AT 2000 FPM. THIS WAS ACCOMPLISHED AND RESULTED IN AN ALTDEV OF PLUS 400 FT TO 37400 FT. BEFORE TCASII ADVISED 'CLR OF TFC,' ATC CTLR WAS ADVISED AND HE TOLD US TFC WAS AN FGT CLBING TO FL350. ATC DID NOT ADVISE OF TFC PRIOR TO OUR INQUIRY. THE CONFLICTING TFC WAS VISUALLY ACQUIRED AFTER THE INITIAL TCASII ADVISORY AND I FELT THE GUIDANCE WAS APPROPRIATE. THE FGT MUST HAVE HAD A VERY HIGH RATE OF CLB TO TRIGGER TCASII.

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.