Air carrier descending for approach has TCASII RA. Climbs.

Attributes
ACN	191629
Time
Date	199110
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tpa
State Reference	FL
Altitude	msl bound lower : 3600 msl bound upper : 4600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tpa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 12000 flight time type : 1800
ASRS Report	191629
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6300 vertical : 1000
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

While being vectored by approach to a modified right downwind/base leg, east of tpa international airport, runway 36L, we received a TCASII TA followed by a TCASII RA, which required a climb. TA followed immediately by an RA occurred at approximately 4000 ft MSL while descending to 3600 ft altitude assigned by approach. After climb accomplished as result of RA, 2 fgts observed at approximately 12-11 O'clock moving right to left, approximately 1000 ft below and 1-2 NM range. Fighters had probably just departed macdill AFB, fl, with a right turnout, heading east. TCASII most likely predicted conflict based on our descent and their climb. However, since I did not have a visual on traffic at time of RA, I climbed several hundred ft per RA until a monitor vertical speed indication received. At that time, I visually acquired target and continued descent. ATC was advised of RA.

Original NASA ASRS Text

Title: ACR DSNDING FOR APCH HAS TCASII RA. CLBS.

Narrative: WHILE BEING VECTORED BY APCH TO A MODIFIED R DOWNWIND/BASE LEG, E OF TPA INTL ARPT, RWY 36L, WE RECEIVED A TCASII TA FOLLOWED BY A TCASII RA, WHICH REQUIRED A CLB. TA FOLLOWED IMMEDIATELY BY AN RA OCCURRED AT APPROX 4000 FT MSL WHILE DSNDING TO 3600 FT ALT ASSIGNED BY APCH. AFTER CLB ACCOMPLISHED AS RESULT OF RA, 2 FGTS OBSERVED AT APPROX 12-11 O'CLOCK MOVING R TO L, APPROX 1000 FT BELOW AND 1-2 NM RANGE. FIGHTERS HAD PROBABLY JUST DEPARTED MACDILL AFB, FL, WITH A R TURNOUT, HDG E. TCASII MOST LIKELY PREDICTED CONFLICT BASED ON OUR DSCNT AND THEIR CLB. HOWEVER, SINCE I DID NOT HAVE A VISUAL ON TFC AT TIME OF RA, I CLBED SEVERAL HUNDRED FT PER RA UNTIL A MONITOR VERT SPD INDICATION RECEIVED. AT THAT TIME, I VISUALLY ACQUIRED TARGET AND CONTINUED DSCNT. ATC WAS ADVISED OF RA.

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.