<< >> NASA ASRS Report 559164, August 2002

C172SP pilot lost control of aircraft and went off side of runway after aborting takeoff due to the elevator trim inadvertently set to full nose down position. The right main tire blew out during abort braking.

Attributes
ACN	559164
Time
Date	200208
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : 07c.airport
State Reference	IN
Altitude	agl single value : 0
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
ASRS Report	559164
Events
Anomaly	aircraft equipment problem : critical excursion : runway non adherence : published procedure other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : trim setting indicator other flight crewa
Resolutory Action	aircraft : automation overrode flight crew
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Plane has manual and yoke power trim activated by thumb. During preflight, I set trim for takeoff. At rotation speed, aircraft would not fly. Not knowing problem, I aborted takeoff, hard braking, skidded and blew out right main tire. The flat tire caused the plane to pull right and I stopped just off runway in the grass. No damage to plane. Inspection showed trim in full nose down position. At some point, my thumb must have pushed on the power trim button during taxi, preflight or takeoff roll. To correct, rechk trim before and during takeoff.

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Original NASA ASRS Text

Title: C172SP PLT LOST CTL OF ACFT AND WENT OFF SIDE OF RWY AFTER ABORTING TKOF DUE TO THE ELEVATOR TRIM INADVERTENTLY SET TO FULL NOSE DOWN POS. THE R MAIN TIRE BLEW OUT DURING ABORT BRAKING.

Narrative: PLANE HAS MANUAL AND YOKE PWR TRIM ACTIVATED BY THUMB. DURING PREFLT, I SET TRIM FOR TKOF. AT ROTATION SPD, ACFT WOULD NOT FLY. NOT KNOWING PROB, I ABORTED TKOF, HARD BRAKING, SKIDDED AND BLEW OUT R MAIN TIRE. THE FLAT TIRE CAUSED THE PLANE TO PULL R AND I STOPPED JUST OFF RWY IN THE GRASS. NO DAMAGE TO PLANE. INSPECTION SHOWED TRIM IN FULL NOSE DOWN POS. AT SOME POINT, MY THUMB MUST HAVE PUSHED ON THE PWR TRIM BUTTON DURING TAXI, PREFLT OR TKOF ROLL. TO CORRECT, RECHK TRIM BEFORE AND DURING TKOF.

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.