To turn the ignition off and on again while shutting down is one method to check for the ground wires to be properly attached. A check of the integrity of the magneto ground wire circuitry is also one of the reasons why during a runup the pilot should watch for a drop in rpm when turning the magnetos off and back on again one after the other. It is essential to get a noticeable drop when turning of either magneto, not just one. If there is no drop observed I would, besides a problem in the respective magneto itself, suspect a faulty ground circuit. Furthermore, if I am not able to ascertain that one magneto can be taken off the circuit properly, I would have no means to make sure that the other magneto is functioning at all.
Stefan in Tokyo Mooney M-10 Cadet N9547V www.crisscross.com/users/sfanselow/m10 -----Original Message----- From: Dave Marshall <[EMAIL PROTECTED]> To: [email protected] <[email protected]> Date: Monday, January 10, 2000 1:35 PM Subject: [COUPERS] Pulling Prop Through There's one procedure I haven't heard anyone mention so far. I first saw this as part of the engine shutdown checklist (checklist!!) for our T-41's. First, the engine is idled at about 1000 RPM. After the avionics and electronics are turned off, the ignition (mag) switch is MOMENTARILY turned to "OFF". If the engine tries to die, it can be assumed that the switch and grounding wire are functioning. The engine is then shut down normally with the mixture control. Obviously, this will only work with carbs equipped with mixture controls which will go to full fuel cutoff. This seems like a cheap and easy check on switch and grounding wire integrity and should make propping the engine just a little safer. Regards, Dave in Alamogordo, NM __________________________________________________________________________ __ ____ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Keep up with breaking news! Join our Hot Topics list. http://www.topica.com/lists/breakingnews/t/12 __________________________________________________________________________ ______ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Keep up with breaking news! Join our Hot Topics list. http://www.topica.com/lists/breakingnews/t/12
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