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Found 1 result

  1. I’m well overdue explaining my off-field landing incident on May 9 of this year, as a result of the D- 3000 dual mag failure. Caution – long write-up but hopefully there are some takeaway points of value here. My wife and I departed from our home base in California for the Chicago area in our M20J as we’ve done many times before. Day 2 we took off from Page, AZ - direct Albuquerque - direct Salina, KS. Enroute at 11.5K nearing Albuquerque we began to hear what sounded like a very faint rattle emanating from the belly area. Listened for a bit and it started to get more frequent. Began troubleshooting to see if it might be engine related. Changed prop, mixture, throttle, pump, tanks with no affect. Best I recall all items on the engine monitor appeared normal. No change until switching to Left mag – nearly dead. Right mag was better but rough. Immediately turned to nearest airport. Declared an emergency with ABQ approach and informed the controller of my situation. Unfortunately, Double Eagle was a couple miles beyond the FF glide ring. Within the next couple minutes the left mag completely failed and had only partial power on the right, but that also failed in the next few minutes. Now it was truly an “oh darn” moment, or words to that effect. How both mags checked good during preflight and both were now failing was not a good feeling. All I knew was I needed to make the best of a bad situation. I tried to reassure my wife that the plane flies perfectly fine as a glider now, we have about ten minutes to reach the airport or find a good place to land and we’ll be alright. We gained some ground on the glide ring as we continued but were battling some 40kt headwinds. Kept the aircraft clean and the glide speed faster than normal in an attempt to minimize time in those strong winds. Glider pilots minimize their time spent in sinking air by flying faster for the same reason. I kept Approach informed of our progress, that I had no power, that I thought it was a dual mag failure and that I might not be able to make the airport. Then came the standard issue question - say number of souls on board and fuel remaining. My wife remained remarkably calm throughout and even helped by scanning around for possible landing locations and obstructions. The fact that I am a fairly experienced glider pilot did help immensely in my opinion. During the entire power-off descent and landing it all seemed rather normal to me because every landing in a glider is an engine out landing. Airports are nice but fields work too. Approach handed me off and Tower had already cleared out traffic for the inbound emergency and cleared us for any runway but winds were strongly favoring 22. It is so gratifying and special to know the ATC professionals will do everything in their power to assist an aircraft in distress. Despite making up some glide distance, it was looking very iffy that we would be able to make the runway. Several miles out we identified what looked like a good open space short of the airport boundary clear of power lines and obstructions. It was our go to place if needed. At about 1000AGL those hangers, roads and fences on final approach looked like something we might not clear. Without hesitation I told the tower unable to make the runway and we're going for the field. The last thing I wanted to do was to try for the airport at all cost only to stretch the glide with disastrous results. As much as I love my Mooney the thought went through my mind to use the plane to save us. I rolled out parallel to the active into the strong headwind, lowered the gear and flaps and did a nice smooth full stall landing on the sandy desert floor. We looked at each other, did a quick embrace and said somewhat jokingly, well that wasn’t a bad landing. We ended up about 100 yards from the airport fence. Tower controller was watching the entire event and offered a big compliment. I let them know that the airplane appeared undamaged and no injuries. Emergency personnel soon began to arrive, followed by airport and FBO staff as well as the FAA. The largest fire in NM history was in progress and the last thing anyone wanted was an airplane crash to spark another blaze in the windy desert scrub. Everyone, and especially me, was relieved that the Mooney was sitting there unscathed. No damage to the prop or even the gear doors, not a scratch that I could see. Full stall landing into a strong wind on the semi-soft surface made for a very short landing. FAA measured the roll out at 322 feet. The two gentlemen from the FAA were extremely nice but also professional. In fact one of them owns an F model so we bonded a bit. They did check the airplane for fuel and oil just to make sure I didn't do something really stupid. They took pictures of the plane as well as my documents and the airplane documents to verify everyone and everything was legal and current. Basically a ramp check in the desert. They also requested I send them scans of the latest annual logbook entries when I returned home. After everyone was satisfied we were fine and all the paperwork was done, one of the maintenance guys offered to help with his small Jeep and a tow bar. It was an easy pull to perimeter road and onto the ramp. Given the situation I’m extremely grateful for the outcome. Day VFR at cruise over a desert having just flown over rugged terrain. Luck played a big part but I’ll take it. Those sounds at the beginning of the event were likely afterfires in the muffler due to incomplete combustion in the cylinders. One would think EGT would be spiking but the JPI 830 didn’t show that and the engine data doesn’t reflect anything out of the ordinary either from what I tell. So what happened? The next morning I met an IA at the plane. We pulled the infamous D-3000 dual mag and right away observed that neither set of points was opening. That's on a recently overhauled mag with 209 hours on it replaced two years prior. Something caused both rubbing blocks to wear down prematurely – and remarkably simultaneously. I’m going with lack of lube because it appeared the oil pads on the points were dry with some fibers scattered about inside the distributor cap. But both sets, and simultaneously? Other commonalities to the failure could be bad surface finish on the common cam, contaminated lube, defective rubbing block material. So, bad parts or a bad rebuild? The FAA says they are looking into it but who knows how long that will take or if anything will come of it. Maybe if more failures occur it will become a higher priority. In the meantime the mag was field repaired (points adjusted and oil wicks lubed, engine timing set) and I flew it back to my home base. It just came out of annual with an emphasis on looking for any possible damage due to the off-field landing. As mentioned, not a scratch or any problems found. I subsequently made that Chicago trip, without my wife this time, and the plane performed perfectly. I plan to have the point gaps checked every 50 hours to see if there is any trend or cause for concern. Lessons learned. When something doesn’t feel or sound right it might be worse than thought. Wasted a few precious minutes troubleshooting before turning to the airport. Pulling back the prop might have improved the glide. Never trained for it, only read about it and being task saturated at the time didn’t think of it. Forty plus years and thousands of hours, mostly in Mooneys, without an engine failure doesn’t mean it can’t happen. I fly a Mooney for safety and its good looks, but also for its efficiency which means I frequently fly direct. Been rather cavalier about flying over inhospitable terrain. My glider buddies call that Tiger country. Glider experience helped. Kept things somewhat routine. Stay current and legal. You never know when a ramp check can occur. Practice various emergencies. Commit important procedures to memory. Single pilot ops too task saturated or no time to look it up. Squawk 7700 in an emergency. Didn’t think of it and wasn’t my highest priority. Hopefully missed my one and only opportunity. ATC already had me as an emergency. Add more items to the survival kit. Could have been far from help or injured. Love Mooneys but hate dual mags. I don’t want this incident to significantly change my flying. Unfortunately, it’s changed my wife’s flying. It was a rare event and the odds of it happening again are highly unlikely. However, the reason for this failure is largely unknown. I’m still flying with the same mag but checking Left and Right in flight now and especially before entering IFR conditions, nighttime or Tiger country. Fly safe.
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