When propping aircraft jumped chocks and hit building.

Attributes
ACN	300843
Time
Date	199504
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : 04mi
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	ground : preflight
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
ASRS Report	300843
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In making ready to put airplane on pontoons, I prepared to start the engine to warm up oil and change it. I chocked the main wheels in order to propeller the plane. In the process the engine flooded and would not start. I turned off the magnetos, advanced the throttle 1/2 and began to turn the propeller backwards to clear the cylinders of excess gasoline. I switched the magnetos back to 'on' but forgot to retard the throttle. The airplane started and jumped the chocks. I tried to hold onto the struts and pull myself in to stop the plane. I was dragged about 100 ft when I could no longer on. The airplane went about 50 yards and hit a maintenance building. I have started this airplane in this manner hundreds of times, and never dreamed the chocks would not hold. In retrospect, the only way to insure safety is a firm tie down and a 'kill' switch accessible while propping.

Original NASA ASRS Text

Title: WHEN PROPPING ACFT JUMPED CHOCKS AND HIT BUILDING.

Narrative: IN MAKING READY TO PUT AIRPLANE ON PONTOONS, I PREPARED TO START THE ENG TO WARM UP OIL AND CHANGE IT. I CHOCKED THE MAIN WHEELS IN ORDER TO PROP THE PLANE. IN THE PROCESS THE ENG FLOODED AND WOULD NOT START. I TURNED OFF THE MAGNETOS, ADVANCED THE THROTTLE 1/2 AND BEGAN TO TURN THE PROP BACKWARDS TO CLR THE CYLINDERS OF EXCESS GASOLINE. I SWITCHED THE MAGNETOS BACK TO 'ON' BUT FORGOT TO RETARD THE THROTTLE. THE AIRPLANE STARTED AND JUMPED THE CHOCKS. I TRIED TO HOLD ONTO THE STRUTS AND PULL MYSELF IN TO STOP THE PLANE. I WAS DRAGGED ABOUT 100 FT WHEN I COULD NO LONGER ON. THE AIRPLANE WENT ABOUT 50 YARDS AND HIT A MAINT BUILDING. I HAVE STARTED THIS AIRPLANE IN THIS MANNER HUNDREDS OF TIMES, AND NEVER DREAMED THE CHOCKS WOULD NOT HOLD. IN RETROSPECT, THE ONLY WAY TO INSURE SAFETY IS A FIRM TIE DOWN AND A 'KILL' SWITCH ACCESSIBLE WHILE PROPPING.

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.