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

  
 

CIRRUS Monthly Proficiency Program
3 part series on IFR operations
August – Part 1: Electrical Systems


Electrical System Abnormalities

ALT 1 and ALT 2 Caution Annunciator Lights

  • Both the SR20 and SR22 are equipped with an annunciator light for each alternator. The annunciator light has two distinct cautionary indications. The first is a steady amber light, indicating that the corresponding alternator has failed.
  • The second alert is a flashing amber light, indicating an overcurrent situation. Either type of indication requires corrective action per the airplane POH (Pilot Operating Handbook).

Problem Situations: Causes and Remedies

  • ALT 1 Steady Illumination
  • Probable cause: ALT 1 has failed, and BAT 1 is powering the entire load on the Main Distribution Bus.
  • Remedy: Review the procedures to reset the alternator in the appropriate POH. If the alternator does not reset, you must begin to load shed to conserve BAT 1 power. See “How to Handle an Electrical Failure,” below. Remember: BAT 1 is a 10 amp battery.

 

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