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In 2003, mechanical and maintenance were the major cause
of 15% of all GA accidents, and 7.5% of fatal accidents
Typically,
one mistake or failure—a precipitating event—leads
to another in a cascading series of malfunctions and mistakes,
culminatiing in an accident. This is called the accident
chain.
By any calculation, the average pilot could
fly many, many lifetimes without having an accident of
any sort, let alone
a much more rare fatal mishap.
In 2003, electrical/ignition
failures accounted for 3% of all accidents, and 0% of fatal
accidents.
2004 Nall Report
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CIRRUS Monthly Proficiency Program
3 part series on IFR operations
August – Part 1: Electrical Systems
Items to Simulate in the Air
- Turn
off ALT 1. Notice that when switched to the BATT position,
the amp meter shows a high rate of discharge. This indicates
that BAT 1 is supplying power to the non-essential equipment.
- Also,
note that approximately 30-60 seconds after turning off
the ALT 1 switch, the ALT 1 annunciator light will illuminate.
Toggle
the amp meter switch to the ALT 1 position and notice
that the
amp meter is reading zero.
- Practice load shedding on the Non-Essential
Bus by manual turning off various items to see how each
item affects the drain on BAT
1. Make sure to not operate with ALT 1 off for more
then 10 minutes.
- Upon completion of this exercise, make sure to re-energize
the system by turning ALT 1 back on. Reference the MFD
engine page for voltage information on the Main Distribution and
Essential
Buses.
- Turn off ALT 2 and notice that there is no change
on the amp meter when in the battery position. Toggle the amp
switch to the ALT 2 position
and notice that
the amp meter is at zero, and that within approximately 30-60 seconds,
the ALT 2 annunciator light should illuminate.
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