Two in the same day. Only two. And due to an interesting reason, seemingly so obvious yet not routinely taught, with nothing major wrong with
the a/c.
The day prior to the two flights it had snowed 10" or so. We went out to do a flight in a C-150. It had gotten down to about 12F or so that
night. We dusted the plane off, pre-flighted it, fueled it, sumped it... etc. Took off, flew 40 nm west at around 4500' and, upon entering a
descent to a field about 10 nm west, the engine windmilled instantly. We Notified tower, she flew a nice deadstick into an airport a few miles
ahead while I worked the radio a little and confirmed the engine dead. An A&P was on hand there and suggested it must have been carb ice. We
knew it was not carb ice. We had applied carb heat more than once during cruise, and prior to initiating descent. It was on and off while
adjusting mixture, throttle, and the fuel valve. all of which, over about a minute or two, during descent, prior to confirming it dead around
2000' agl. It did start for the A&P however; and ran up quite well. we were perplexed, called the FBO, got confirmation from both the on-site
A&P and the home A&P that it was a fluke, most likely carb ice. I did not feel comfortable with that diagnosis at all. No change took place
when applying heat at any time.
Still concerned, we pre-flighted, loaded up, fired up, and took off. This time, it was my leg. I initialized a climb and decided to circle
above the airport until reaching 5500' prior to heading east. Heading east, we got within about 20 nm of our destination, lowered the nose
slightly, applied carb heat, etc. It went silent again. This time, we were abeam an airport about 90 degrees due south of our heading about 8
miles away. We turned that way and requested radar vectors. With the assistance of ATC, we got nice vectors to a long left downwind leg to a
small airport covered in snow. Being a little high on downwind, I pulled the barn-doors down on base/final, gave it a slip, and were on the
ground in no time. Then... The engine started up as soon as the mains hit the snow of the runway.
Don't get me wrong, it was nice to have to do a soft-field taxi to the tarmac with a running engine... It's just that it makes you look bad in
your head when you declare, then taxi up with a running engine. lol.
Needless to say, we were not flying the plane back. We called, the FBO came, picked us up, and brought their A&p. The A&P was actually an A&I.
He picked up the wing, near the tip and shook it. You could hear it sound like a cooler with ice/water mixed in it being shaken.
The fuel caps had leaked, melting snow from the day before into the wing tanks. It had re-frozen during the night with temps down to 10/12
degrees. Even though all three sumps had been drained and checked, there was no water in the fuel prior to both flights. It was all in the form
of ice in the tanks. When we lowered the nose, the ice would shift, and cover up the fuel intakes, resulting in the engine loss. As soon as we
hit the runway, with a high AOA, it shook loose, and the engine fired back up.
Think about Water taking on the form of ice in the fuel. It was never mentioned to either of us prior to that, and I don't think a lot of people
do. I know maintenance is high on A/C but maaybe we should check those fuel cap seals more often too.
Little bit of insight. At least all turned out well. I guess that's why my Flight Instructor called the PPL a 'license to learn.'