Close proximity air carrier-medium large transport GA-small aircraft in bwi arsa under the dca 30 NM...

Attributes
ACN	187462
Time
Date	199108
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bal airport : bwi
State Reference	MD
Altitude	msl bound lower : 2000 msl bound upper : 2900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi tower : isp
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8000
ASRS Report	187462
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 5000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While being vectored for approach to bwi, in-flight visibility was about 3 mi. TCASII alerted 'traffic', then shortly gave RA to 'climb'. I began a climb to about 2900 ft in response to commands on the vertical speed indicator. We saw an small aircraft pass off our right wing at about 2500 ft less than 1 mi. ATC advised that we had 'lost separation' with a helicopter. We never saw the helicopter. The TCASII speaker did interfere with ATC communications. Also, the TCASII screen is shared with the radar screen. We had 10 mi scale selected and found too much time spent heads down trying to interpret TCASII data.

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMA IN BWI ARSA UNDER THE DCA 30 NM TCA VAIL.

Narrative: WHILE BEING VECTORED FOR APCH TO BWI, INFLT VISIBILITY WAS ABOUT 3 MI. TCASII ALERTED 'TFC', THEN SHORTLY GAVE RA TO 'CLB'. I BEGAN A CLB TO ABOUT 2900 FT IN RESPONSE TO COMMANDS ON THE VERT SPD INDICATOR. WE SAW AN SMA PASS OFF OUR R WING AT ABOUT 2500 FT LESS THAN 1 MI. ATC ADVISED THAT WE HAD 'LOST SEPARATION' WITH A HELI. WE NEVER SAW THE HELI. THE TCASII SPEAKER DID INTERFERE WITH ATC COMS. ALSO, THE TCASII SCREEN IS SHARED WITH THE RADAR SCREEN. WE HAD 10 MI SCALE SELECTED AND FOUND TOO MUCH TIME SPENT HEADS DOWN TRYING TO INTERPRET TCASII DATA.

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.

Close proximity air carrier-medium large transport GA-small aircraft in bwi arsa under the dca 30 NM TCA vail.