Captain of a fokker 100 descended in response to a TCASII RA since he had not had a visual sighting of the aircraft given in an advisory by ATC. The controller asked why that reporter had descended after being given an advisory of a beech baron pilot confirmed having the F100 in sight.

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Attributes
ACN	452720
Time
Date	199910
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : dietz
State Reference	TX
Altitude	msl bound lower : 10500 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : cqy.cqy4
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Make Model Name	Baron 55/Cochise
Flight Phase	cruise : level
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	452720
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 300
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

ATC facility: regional approach control. Location--approaching dietz intersection. Received controller advisory that a baron would cross in front of us at 11500 ft VFR. Observed the aircraft on TCASII while we both searched visually for it. The altitude readout we had on him was +300 ft. Could not acquire the aircraft visually, and then got an RA from TCASII. I (PNF) followed it gently and went down to approximately 10500 ft. Then gently returned to 11000 ft. Controller became concerned that in VFR we followed the RA, even when the baron pilot advised that he had us in sight. If we could not acquire him visually, it would not have been correct procedurally or using common sense to not follow the RA.

Original NASA ASRS Text

Title: CAPT OF A FOKKER 100 DSNDED IN RESPONSE TO A TCASII RA SINCE HE HAD NOT HAD A VISUAL SIGHTING OF THE ACFT GIVEN IN AN ADVISORY BY ATC. THE CTLR ASKED WHY THAT RPTR HAD DSNDED AFTER BEING GIVEN AN ADVISORY OF A BEECH BARON PLT CONFIRMED HAVING THE F100 IN SIGHT.

Narrative: ATC FACILITY: REGIONAL APCH CTL. LOCATION--APCHING DIETZ INTXN. RECEIVED CTLR ADVISORY THAT A BARON WOULD CROSS IN FRONT OF US AT 11500 FT VFR. OBSERVED THE ACFT ON TCASII WHILE WE BOTH SEARCHED VISUALLY FOR IT. THE ALT READOUT WE HAD ON HIM WAS +300 FT. COULD NOT ACQUIRE THE ACFT VISUALLY, AND THEN GOT AN RA FROM TCASII. I (PNF) FOLLOWED IT GENTLY AND WENT DOWN TO APPROX 10500 FT. THEN GENTLY RETURNED TO 11000 FT. CTLR BECAME CONCERNED THAT IN VFR WE FOLLOWED THE RA, EVEN WHEN THE BARON PLT ADVISED THAT HE HAD US IN SIGHT. IF WE COULD NOT ACQUIRE HIM VISUALLY, IT WOULD NOT HAVE BEEN CORRECT PROCEDURALLY OR USING COMMON SENSE TO NOT FOLLOW THE 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.