Air carrier medium large transport runway taxiway excursion after landing.

Attributes
ACN	131077
Time
Date	198912
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : btr
State Reference	LA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 7000
ASRS Report	131027
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 800
ASRS Report	130963
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After a normal ILS to 22R at btr and a normal landing, T/D on 1000' mark, on approach bug, 40 degree flaps, abs selected minimum, normal reversing, brakes released at 80 KTS by manual braking, out of reverse about 65 KTS and slowed to taxi speed at more than 1000' from end of 22R. Turning onto taxiway alpha nose wheel steering became unresponsive about 2/3 through the 135 degree turn and the aircraft left the taxiway with nose wheel and left main gear in deep mud. Ground control and company operations were notified. The after landing/taxi checklist and the parking checklist were completed, and passenger were advised to expect to deplane via the aft stairs onto a bus to the terminal. The aircraft had passed beyond the hold short line on the taxiway when it slid off left side of taxiway and stopped. Aft stairs were on the concrete. Although taxi speed seemed appropriate for conditions, it is quite likely that the loss of steering control effectiveness would not have occurred at a lower speed. Braking on the runway was good, but the rain-slick taxiway was a different proposition. It is felt that other factors outside the awareness of the pilot were involved, including aircraft cg and weight on nose wheel, unequal nose tire pressures and tread wear, and the variation in slope or crown of the paved surfaces.

Original NASA ASRS Text

Title: ACR MLG RWY TXWY EXCURSION AFTER LNDG.

Narrative: AFTER A NORMAL ILS TO 22R AT BTR AND A NORMAL LNDG, T/D ON 1000' MARK, ON APCH BUG, 40 DEG FLAPS, ABS SELECTED MINIMUM, NORMAL REVERSING, BRAKES RELEASED AT 80 KTS BY MANUAL BRAKING, OUT OF REVERSE ABOUT 65 KTS AND SLOWED TO TAXI SPD AT MORE THAN 1000' FROM END OF 22R. TURNING ONTO TXWY ALPHA NOSE WHEEL STEERING BECAME UNRESPONSIVE ABOUT 2/3 THROUGH THE 135 DEG TURN AND THE ACFT LEFT THE TXWY WITH NOSE WHEEL AND LEFT MAIN GEAR IN DEEP MUD. GND CTL AND COMPANY OPS WERE NOTIFIED. THE AFTER LNDG/TAXI CHKLIST AND THE PARKING CHKLIST WERE COMPLETED, AND PAX WERE ADVISED TO EXPECT TO DEPLANE VIA THE AFT STAIRS ONTO A BUS TO THE TERMINAL. THE ACFT HAD PASSED BEYOND THE HOLD SHORT LINE ON THE TXWY WHEN IT SLID OFF LEFT SIDE OF TXWY AND STOPPED. AFT STAIRS WERE ON THE CONCRETE. ALTHOUGH TAXI SPD SEEMED APPROPRIATE FOR CONDITIONS, IT IS QUITE LIKELY THAT THE LOSS OF STEERING CONTROL EFFECTIVENESS WOULD NOT HAVE OCCURRED AT A LOWER SPD. BRAKING ON THE RWY WAS GOOD, BUT THE RAIN-SLICK TXWY WAS A DIFFERENT PROPOSITION. IT IS FELT THAT OTHER FACTORS OUTSIDE THE AWARENESS OF THE PLT WERE INVOLVED, INCLUDING ACFT CG AND WT ON NOSE WHEEL, UNEQUAL NOSE TIRE PRESSURES AND TREAD WEAR, AND THE VARIATION IN SLOPE OR CROWN OF THE PAVED SURFACES.

Data retrieved from NASA's ASRS site as of August 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.