![]() If, when alternating from left to right magneto by switchingwith your ignition, you do not notice a magneto drop, this may indicatea "hot mag" situation, which could be caused by a disconnected"P" lead. One very simple check for a potential "hot mag" situationis to carefully watch your RPM drop either during your initial run up orbefore a shutdown, assuming your tachometer is working properly to reportthis RPM change. All of the above scenarios may be intermittent,making it difficult, if not impossible, to locate the problem. This "P" lead wire can comeloose at anytime without notice. There have been severalthousand recalls of faulty ignition switches, starting capacitors, starters,and magnetos in all types of aircraft, that will allow a propeller to startspinning inadvertently when rotated, even if the keys are out of the ignition.Even with a properly working ignition switch, if the wire known as a "P"lead, running from the ignition to the magnetos, becomes disconnected orcut (from vibration or whatever), once again you have what is known asa "hot mag" situation. If you are one of those adventurous pilots who still ignores all thesewarnings, at least be mindful of the following. However, Airborne says thatpossible damage to dry vacuum pump vanes may result by reverse rotation. Some mechanics suggest rotating the propeller in the reverse directionwhich will prevent an inadvertent start as the impulse coupling is notactivated with reverse propeller rotation. (Unless the mag has an internal grounding spring, a disconnected"P" lead leaves the mag hot.)Īs far as rotating your prop to place it in a vertical position forice and water drainage or to attach your tow bar is it worth risking yourlife? Propellers are most likely to start spinning when the engine is warmwith residual fuel in the carburetor! ![]() If your aircraft is in storage, I would not rotate the propeller unlessI knew the spark plugs were removed and/or the magneto ignition completelydisconnected. With the advent of multi-viscosity oils, which most of us now use,it is not necessary for anyone to pre-rotate the propeller for oil limbering…asCessna still suggests, though Lycoming does not. I have come to the conclusion that there are no compelling reasonsto ever hand rotate the propeller. Few CFIs or pilotexaminers provide guidance about propeller safety, apparently assumingthe aircraft manual provides this information. To move the propeller out of the way for attaching a tow bar.īut few of us have been properly trained about the proper precautionsthat need to be taken before touching that propeller. To align the prop in a vertical position for outside storage so asto allow rain and ice to evacuate the spinner area. ![]() If your aircraft is stored longer than 10 days to lubricate the internalengine components. When the outside temperature is below 20 degrees F to loosen and limberthe oil before startup, which will make normal starting easier, distributeoil on bearing surfaces, and conserve battery life.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |