An A319 nosewheel steering developed large amplitude left and right motions after landing roll on a ...

Attributes
ACN	750761
Time
Date	200708
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	agl single value : 0
Environment
Weather Elements	Rain
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 185 flight time total : 10000 flight time type : 1800
ASRS Report	750761
Events
Anomaly	aircraft equipment problem : less severe other anomaly
Independent Detector	other flight crewa
Resolutory Action	other
Supplementary
Problem Areas	Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

After an uneventful landing rollout to the high speed taxiway; I transitioned lateral control of the aircraft from the rudder pedal steering to the nosewheel tiller. It had been raining and the first officer and I saw some standing water on the txwys. The first officer noticed that it felt like the aircraft antiskid was 'working' as we went through a small puddle because indeed the small bump that we both felt in the seat of our pants did feel like antiskid cycling. When I straightened out the aircraft onto the parallel taxiway and returned the tiller to the neutral position; the aircraft began jerky uncommanded right and left steering motions. It was very small at first and we thought maybe we had blown a tire. But as I rolled forward a little more I assessed that the nosewheel steering was the problem. I taxied further and we both noticed that the transient uncommanded left and right motion of the aircraft became larger in amplitude. It was at that time (at the entrance to the midfield ramp for parking) that we elected to stop and ask for a tow in to our gate. We accomplished the tow-in checklist.

Original NASA ASRS Text

Title: AN A319 NOSEWHEEL STEERING DEVELOPED LARGE AMPLITUDE L AND R MOTIONS AFTER LNDG ROLL ON A WET RWY. FLT CREW HAD THE ACFT TOWED TO THE GATE.

Narrative: AFTER AN UNEVENTFUL LNDG ROLLOUT TO THE HIGH SPD TXWY; I TRANSITIONED LATERAL CTL OF THE ACFT FROM THE RUDDER PEDAL STEERING TO THE NOSEWHEEL TILLER. IT HAD BEEN RAINING AND THE FO AND I SAW SOME STANDING WATER ON THE TXWYS. THE FO NOTICED THAT IT FELT LIKE THE ACFT ANTISKID WAS 'WORKING' AS WE WENT THROUGH A SMALL PUDDLE BECAUSE INDEED THE SMALL BUMP THAT WE BOTH FELT IN THE SEAT OF OUR PANTS DID FEEL LIKE ANTISKID CYCLING. WHEN I STRAIGHTENED OUT THE ACFT ONTO THE PARALLEL TXWY AND RETURNED THE TILLER TO THE NEUTRAL POS; THE ACFT BEGAN JERKY UNCOMMANDED R AND L STEERING MOTIONS. IT WAS VERY SMALL AT FIRST AND WE THOUGHT MAYBE WE HAD BLOWN A TIRE. BUT AS I ROLLED FORWARD A LITTLE MORE I ASSESSED THAT THE NOSEWHEEL STEERING WAS THE PROB. I TAXIED FURTHER AND WE BOTH NOTICED THAT THE TRANSIENT UNCOMMANDED L AND R MOTION OF THE ACFT BECAME LARGER IN AMPLITUDE. IT WAS AT THAT TIME (AT THE ENTRANCE TO THE MIDFIELD RAMP FOR PARKING) THAT WE ELECTED TO STOP AND ASK FOR A TOW IN TO OUR GATE. WE ACCOMPLISHED THE TOW-IN CHKLIST.

Data retrieved from NASA's ASRS site as of January 2009 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.

An A319 nosewheel steering developed large amplitude left and right motions after landing roll on a wet runway. Flight crew had the aircraft towed to the gate.