On start of takeoff roll; LJ25 suddenly veers left and exits runway surface.

Attributes
ACN	645465
Time
Date	200501
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cno.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Learjet 25
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial
Experience	flight time last 90 days : 40 flight time total : 6000 flight time type : 700
ASRS Report	645465
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical excursion : runway other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

On a good VFR day -- clear; dry. On takeoff at cno airport; after initial power advance; aircraft suddenly made a hard turn to left; exiting runway into grass. Steering by pedal ineffective; rudder not effective; but was not up to control speed of rudder. Power was reduced and aircraft came to a stop approximately 35 ft from runway in grassy area. Power applied slowly and aircraft taxied to hangar. No injuries. Minimal damage (dent on right leading edge; recognition light broken; fan on left fuel tank bent). Have no explanation as to why. Flew aircraft on jan/fri/05 4 hours. The aircraft had not been flown in last 2 yrs; except for a check-out flight approximately 1 month ago. All maintenance and inspections were up-to-date. Everything seemed normal; until abrupt left turn from runway. All preflight and checklists were used. No discrepancies prior to flight.

Original NASA ASRS Text

Title: ON START OF TKOF ROLL; LJ25 SUDDENLY VEERS L AND EXITS RWY SURFACE.

Narrative: ON A GOOD VFR DAY -- CLR; DRY. ON TKOF AT CNO ARPT; AFTER INITIAL PWR ADVANCE; ACFT SUDDENLY MADE A HARD TURN TO L; EXITING RWY INTO GRASS. STEERING BY PEDAL INEFFECTIVE; RUDDER NOT EFFECTIVE; BUT WAS NOT UP TO CTL SPD OF RUDDER. PWR WAS REDUCED AND ACFT CAME TO A STOP APPROX 35 FT FROM RWY IN GRASSY AREA. PWR APPLIED SLOWLY AND ACFT TAXIED TO HANGAR. NO INJURIES. MINIMAL DAMAGE (DENT ON R LEADING EDGE; RECOGNITION LIGHT BROKEN; FAN ON L FUEL TANK BENT). HAVE NO EXPLANATION AS TO WHY. FLEW ACFT ON JAN/FRI/05 4 HRS. THE ACFT HAD NOT BEEN FLOWN IN LAST 2 YRS; EXCEPT FOR A CHK-OUT FLT APPROX 1 MONTH AGO. ALL MAINT AND INSPECTIONS WERE UP-TO-DATE. EVERYTHING SEEMED NORMAL; UNTIL ABRUPT L TURN FROM RWY. ALL PREFLT AND CHKLISTS WERE USED. NO DISCREPANCIES PRIOR TO FLT.

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.