A B737-700 first officer reported a wake vortex encounter on approach to bwi triggered a windshear w...

Attributes
ACN	924015
Time
Date	201012
Local Time Of Day	1201-1800
Place
Locale Reference	BWI.Airport
State Reference	MD
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 139 Flight Crew Type 5000
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter Wake Vortex Encounter

Narrative:

On approach to 33L at bwi; we were vectored behind another aircraft about 2.5 miles [ahead of us]. We were getting light chop on the approach with no reports of windshear by any preceding aircraft. As we rolled out behind our traffic; we hit what we perceived [to be] wake turbulence. The aircraft rolled to the left and triggered the windshear warning. As the pilot flying; I disengaged the autopilot and corrected the roll. By that time the windshear warning had gone away. All the instruments seemed normal and we landed normally. Once on the ground; the captain and I talked over the situation and decided that we should not have second-guessed the technology in the aircraft. The windshear warning is a mandatory go-around.

Original NASA ASRS Text

Title: A B737-700 First Officer reported a wake vortex encounter on approach to BWI triggered a windshear warning that the crew chose to ignore because they were sure of its cause.

Narrative: On approach to 33L at BWI; we were vectored behind another aircraft about 2.5 miles [ahead of us]. We were getting light chop on the approach with no reports of windshear by any preceding aircraft. As we rolled out behind our traffic; we hit what we perceived [to be] wake turbulence. The aircraft rolled to the left and triggered the windshear warning. As the Pilot Flying; I disengaged the autopilot and corrected the roll. By that time the windshear warning had gone away. All the instruments seemed normal and we landed normally. Once on the ground; the Captain and I talked over the situation and decided that we should not have second-guessed the technology in the aircraft. The windshear warning is a mandatory go-around.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-700 first officer reported a wake vortex encounter on approach to bwi triggered a windshear warning that the crew chose to ignore because they were sure of its cause.