<< >> NASA ASRS Report 507010, April 2001

B737 flight crew execute TCASII RA escape maneuver when observing a dash 8 approximately one half mi, converging at same altitude, when on approach to dca runway 19.

Attributes
ACN	507010
Time
Date	200104
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca.airport
State Reference	DC
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mem.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : dca.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	507010
Events
Anomaly	conflict : airborne critical non adherence : published procedure
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Airspace Structure Flight Crew Human Performance Airport Environmental Factor
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

On approach to dca (river visual runway 19) at approximately 4 DME and 2000 ft MSL, observed a dash 8 commuter at 3 O'clock position, co-altitude, and converging. TCASII immediately issued an RA commanding a climb. We climbed to 3000 ft MSL and continued to follow the potomac river sbound until dca approach commenced vectors for another approach to runway 19.

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Original NASA ASRS Text

Title: B737 FLT CREW EXECUTE TCASII RA ESCAPE MANEUVER WHEN OBSERVING A DASH 8 APPROX ONE HALF MI, CONVERGING AT SAME ALT, WHEN ON APCH TO DCA RWY 19.

Narrative: ON APCH TO DCA (RIVER VISUAL RWY 19) AT APPROX 4 DME AND 2000 FT MSL, OBSERVED A DASH 8 COMMUTER AT 3 O'CLOCK POS, CO-ALT, AND CONVERGING. TCASII IMMEDIATELY ISSUED AN RA COMMANDING A CLB. WE CLBED TO 3000 FT MSL AND CONTINUED TO FOLLOW THE POTOMAC RIVER SBOUND UNTIL DCA APCH COMMENCED VECTORS FOR ANOTHER APCH TO RWY 19.

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.