On Wed, 11 Apr 2007 23:21:42 -0500, "Maxwell" wrote:

I didn't see any numbers on icing, or control failure due to ice though.
Ron, was that part of the General Pilot Error figure, or did it say?

The figures I posted was from my own analysis, and covered only non-training
accidents in 172s and 210s from 1998-2004. I didn't find any in-flight icing
accidents of these aircraft in this period, although several due to not removing
frost during preflight.

My process was to download the NTSB reports, read the narrative, and come to my
own conclusion as to the cause. I mostly, but not always, agreed with the
NTSB's probable cause.

Here are the cause categories included in my database:

Engine failures -
Undetermined
Engine Internal
Fuel - Firewall forward
Fuel - Aft of Firewall
Ignition
Fuel Exhaustion/Starvation
Fuel Contamination
Drive system
Oil System
Carburetor Mechanical
Carb Ice
Cooling System
General Pilot Mishandling, including loss of control due to stalls, winds,
other, and unknown.
VFR to IFR
Disorientation
Wake Turbulence
Mechanical Failure
Airframe
Controls
Propeller/spinner
Other
Maneuvering at Low Alt
Failure to Recover from maneuver (deliberate aerobatics)
Pilot Incapacitation
Density Altitude
Manufacturer/Builder error
Maintenance Error
Midair
Control Blockage
Inadequate Preflight
Inexperience
CG or Weight
Fire
Suicide
Controller Error
Undetermined

During my analysis, I would assign an "Initiator" (my equivalent of probable
cause) and check off other categories as secondary/tertiary factors as
appropriate.

The analysis was performed as part of a study of homebuilt accidents, published
in KITPLANES magazine last year. I included the Cessna 172/210 accidents as a
control group.

Ron Wanttaja