<< >> NASA ASRS Report 386390, November 1997

MD11 on a coupled approach has tracking problem when nosewheel touches runway on landing. Autoplt is disconnected and normal procedures return.

Attributes
ACN	386390
Time
Date	199711
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 23000 flight time type : 350
ASRS Report	386390
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

A coupled approach to an autoland was flown to runway 18L at cvg. The approach was conducted using 50 degrees of landing flaps and autobrakes set to minimum. The touchdown was normal at 140 KTS in the touchdown zone and on centerline. Main gear touchdown and autospoiler deployment was normal. Upon nosewheel touchdown, the aircraft immediately began tracking left and attempted to exit the left side of the runway. Disconnecting the autoplt and applying right rudder and nosewheel steering returned the aircraft to the runway centerline where normal braking and thrust reverse allowed a normal rollout and turnoff. There did not appear to be any interference to the localizer signal up until the time of nosewheel touchdown.

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Original NASA ASRS Text

Title: MD11 ON A COUPLED APCH HAS TRACKING PROB WHEN NOSEWHEEL TOUCHES RWY ON LNDG. AUTOPLT IS DISCONNECTED AND NORMAL PROCS RETURN.

Narrative: A COUPLED APCH TO AN AUTOLAND WAS FLOWN TO RWY 18L AT CVG. THE APCH WAS CONDUCTED USING 50 DEGS OF LNDG FLAPS AND AUTOBRAKES SET TO MINIMUM. THE TOUCHDOWN WAS NORMAL AT 140 KTS IN THE TOUCHDOWN ZONE AND ON CTRLINE. MAIN GEAR TOUCHDOWN AND AUTOSPOILER DEPLOYMENT WAS NORMAL. UPON NOSEWHEEL TOUCHDOWN, THE ACFT IMMEDIATELY BEGAN TRACKING L AND ATTEMPTED TO EXIT THE L SIDE OF THE RWY. DISCONNECTING THE AUTOPLT AND APPLYING R RUDDER AND NOSEWHEEL STEERING RETURNED THE ACFT TO THE RWY CTRLINE WHERE NORMAL BRAKING AND THRUST REVERSE ALLOWED A NORMAL ROLLOUT AND TURNOFF. THERE DID NOT APPEAR TO BE ANY INTERFERENCE TO THE LOC SIGNAL UP UNTIL THE TIME OF NOSEWHEEL TOUCHDOWN.

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.