Runway excursion by an LR55 with a low time first officer at the controls during a night operation.

Attributes
ACN	621273
Time
Date	200406
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : lex.airport
State Reference	KY
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	general aviation : corporate
Make Model Name	Learjet 55
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : cfi pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 1150 flight time type : 4
ASRS Report	621273
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	excursion : runway other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Problem Areas	Environmental Factor Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My leg into lex runway 22. Night landing. Touched down a bit long due to unmarked displaced threshold. When wheels hit the runway, I applied full braking and reverse. Captain took over. Left main gear exited runway surface. No aircraft damage and no emergency declared.

Original NASA ASRS Text

Title: RWY EXCURSION BY AN LR55 WITH A LOW TIME FO AT THE CTLS DURING A NIGHT OP.

Narrative: MY LEG INTO LEX RWY 22. NIGHT LNDG. TOUCHED DOWN A BIT LONG DUE TO UNMARKED DISPLACED THRESHOLD. WHEN WHEELS HIT THE RWY, I APPLIED FULL BRAKING AND REVERSE. CAPT TOOK OVER. L MAIN GEAR EXITED RWY SURFACE. NO ACFT DAMAGE AND NO EMER DECLARED.

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.