It is a continuing problem. Mag switches wear out and the
engine will "fail safe" to a running condition when the
switch fails "open" circuit. The AD is so that the failed
mag switch will be detected before someone is killed.




"Peter R." wrote in message
...
| Jim Macklin wrote:
|
| Just about all light aircraft since the AD is on the mag
| switch.
|
| The AD for my Bonanza is dated 1977. Are you saying that
this ignition
| problem exists for aircraft manufactured after that year?
|
| --
| Peter