A C172 pilot departs 1o2 using an unusable part of a displaced threshold.

Attributes
ACN	590253
Time
Date	200306
Day	Mon
Local Time Of Day	1201 To 1800
Place
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi ground : takeoff roll
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 21.5 flight time total : 152.9 flight time type : 151.6
ASRS Report	590253
Events
Anomaly	excursion : runway non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Airport
Primary Problem	Flight Crew Human Performance

Narrative:

Myself and friend flew to (1o2) lake port, lampson for lunch. Lampson is an uncontrolled airport near clear lake, ca. Upon completing airplane checks and run-up checks, I obtained AWOS-2 information observing density altitude as '+3200 ft.' I announced and took runway 28 for a downwind departure back to gnossfield, ca. Wanting to use as much runway as possible, I inadvertently entered the displaced threshold end of runway 28 marked with yellow chevrons. I did not notice yellow chevrons painted on threshold end of runway. To prevent a recurrence, a note in the commercial airport directory would have been helpful during my flight planning.

Original NASA ASRS Text

Title: A C172 PLT DEPARTS 1O2 USING AN UNUSABLE PART OF A DISPLACED THRESHOLD.

Narrative: MYSELF AND FRIEND FLEW TO (1O2) LAKE PORT, LAMPSON FOR LUNCH. LAMPSON IS AN UNCTLED ARPT NEAR CLEAR LAKE, CA. UPON COMPLETING AIRPLANE CHKS AND RUN-UP CHKS, I OBTAINED AWOS-2 INFO OBSERVING DENSITY ALT AS '+3200 FT.' I ANNOUNCED AND TOOK RWY 28 FOR A DOWNWIND DEP BACK TO GNOSSFIELD, CA. WANTING TO USE AS MUCH RWY AS POSSIBLE, I INADVERTENTLY ENTERED THE DISPLACED THRESHOLD END OF RWY 28 MARKED WITH YELLOW CHEVRONS. I DID NOT NOTICE YELLOW CHEVRONS PAINTED ON THRESHOLD END OF RWY. TO PREVENT A RECURRENCE, A NOTE IN THE COMMERCIAL ARPT DIRECTORY WOULD HAVE BEEN HELPFUL DURING MY FLT PLANNING.

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.