<< >> NASA ASRS Report 612476, March 2004

A B757 flight crew notice a 5 degree left yaw on takeoff, resulting in the flight crew declaring an emergency and landing overweight at departure airport.

Attributes
ACN	612476
Time
Date	200403
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	612476
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	612784
Events
Anomaly	aircraft equipment problem : less severe other anomaly
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

On takeoff roll runway 9L, near V1 speed, aircraft made an abrupt 5 degree yaw to the left. Wind was called at 080 degrees/11 KTS. I corrected the yaw immediately and continued the rotation and liftoff. Captain directed leaving the gear extended as we suspected a tire or brake malfunction. Captain contacted tower to request a runway inspection and declared an emergency. Normal pattern was flown. Overweight landing briefing and checklist items were completed. Taxied clear and after fire department inspection, returned to gate for maintenance action.

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Original NASA ASRS Text

Title: A B757 FLT CREW NOTICE A 5 DEG L YAW ON TKOF, RESULTING IN THE FLT CREW DECLARING AN EMER AND LNDG OVERWT AT DEP ARPT.

Narrative: ON TKOF ROLL RWY 9L, NEAR V1 SPD, ACFT MADE AN ABRUPT 5 DEG YAW TO THE L. WIND WAS CALLED AT 080 DEGS/11 KTS. I CORRECTED THE YAW IMMEDIATELY AND CONTINUED THE ROTATION AND LIFTOFF. CAPT DIRECTED LEAVING THE GEAR EXTENDED AS WE SUSPECTED A TIRE OR BRAKE MALFUNCTION. CAPT CONTACTED TWR TO REQUEST A RWY INSPECTION AND DECLARED AN EMER. NORMAL PATTERN WAS FLOWN. OVERWT LNDG BRIEFING AND CHKLIST ITEMS WERE COMPLETED. TAXIED CLR AND AFTER FIRE DEPT INSPECTION, RETURNED TO GATE FOR MAINT ACTION.

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.