<< >> NASA ASRS Report 374381, July 1997

An air carrier BA32 flight crew hit the wake of a B737 that is crossed over them while on final approach and they execute a go around to escape.

Attributes
ACN	374381
Time
Date	199707
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : stl
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 2700 flight time type : 650
ASRS Report	374381
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On jul/xa/97 at stl, our flight was returning from columbia, mo, to st louis, mo. The runway 12's were active, we had been cleared for a visual to runway 12R. We were informed of traffic at 10 O'clock which was above us. We called traffic in sight (an air carrier B737). We were asked to switch to runway 13 while on a 4 mi final and we complied. We were informed that traffic would be passing over top of us to be landing runway 12L. After we were established on final for runway 13 at 300 ft AGL, we encountered the B737's wake turbulence. We were forced to go around in the interest of safety. We were vectored back around and landed on runway 12L.

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Original NASA ASRS Text

Title: AN ACR BA32 FLC HIT THE WAKE OF A B737 THAT IS CROSSED OVER THEM WHILE ON FINAL APCH AND THEY EXECUTE A GAR TO ESCAPE.

Narrative: ON JUL/XA/97 AT STL, OUR FLT WAS RETURNING FROM COLUMBIA, MO, TO ST LOUIS, MO. THE RWY 12'S WERE ACTIVE, WE HAD BEEN CLRED FOR A VISUAL TO RWY 12R. WE WERE INFORMED OF TFC AT 10 O'CLOCK WHICH WAS ABOVE US. WE CALLED TFC IN SIGHT (AN ACR B737). WE WERE ASKED TO SWITCH TO RWY 13 WHILE ON A 4 MI FINAL AND WE COMPLIED. WE WERE INFORMED THAT TFC WOULD BE PASSING OVER TOP OF US TO BE LNDG RWY 12L. AFTER WE WERE ESTABLISHED ON FINAL FOR RWY 13 AT 300 FT AGL, WE ENCOUNTERED THE B737'S WAKE TURB. WE WERE FORCED TO GAR IN THE INTEREST OF SAFETY. WE WERE VECTORED BACK AROUND AND LANDED ON RWY 12L.

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.