Re: Forced landing 11/06/11
Way to go. Been there done that. I had an off airport landing two years ago. I guess training paid off. I had probably one of my better landings! in a soybean field. Don't remember turning gas valve and switches off, but I did. I was at 1100 feet, so didn't have much time. One thing it taught me was pick your best landing spot and stick with it. Don't second guess during the event.
Re: Forced landing 11/06/11
Quote:
fuel is good hi grade stuff from an F.B.O
Is it 100 LL or auto fuel? Do you run any auto fuel?
Do you have any mil-spec black fuel lines in the aircraft? Those fuel lines were supplied with many kits years ago before they knew there was a concern. Still finding them in aircraft flying today. They are known for swelling on the inside causing fuel flow restriction with no apparent changes visible from the outside. Might be a reason you can run awhile at higher rpms then it drops off. Just one place to start your search for the cause. Good luck.
Congrats. on a successful landing.:)
Re: Forced landing 11/06/11
Hey mods, can you fix the title??? this landing is 4 days away from happening!
Re: Forced landing 11/06/11
your right it was last Sunday, I;m not planning on one next Sunday
Re: Forced landing 11/06/11
From the comfort of my armchair and only two days past Monday I can only offer armchair advice. It's much better to be there in person but this will have to do.
It sounds like fuel starvation. So the first place I'd look is fuel flow. Take off the fuel supply lines and let the fuel flow into a bucket. See if the fuel flows freely for at least two gallons. A short squirt of a cup or two doesn't count. This will check if you have any problems as the header tank begins to drain. While you are doing the fuel flow testing, see if the header tank remains full. Any indication of header tank level dropping indicates you need to look at the fuel tank finger strainers. If you have any inline filters remove them and do the test again.
Next, look at the fuel pump. The spec for Rotax is about 5.7 psi. Excess pressure can cause flooding and the engine could falter the same as if pressure that is too low. There is a service letter on the Rotax fuel pumps. See if it applies to your pump.
That should get you started. Let us know what you find.
John Pitkin
Greenville, TX
Re: Forced landing 11/06/11
I think John nailed it. It sounds like exactly what happened to me once right after servicing the fuel system. I had just replaced all fuel lines forward of the firewall and an error on my part resulted in reduced fuel flow. It idled fine out to the run up area. Enough fuel in the bowls to sustain the run up, then as I taxied out for take off the bowls filled again, then after departure, I got to about 200 ft and rough running. Engine never quit and I was able to do a 180 and land. I would suspect that there is an issue with fuel flow introduced with yesterday's fuel filter change. My error was, I overtightened a fire sleeve clamp reducing the fuel flow to just above idle requirements.
Lowell
Re: Forced landing 11/06/11
Thanks, I did do some clamp tightening but it was on the coolant and oil system, every 20 hours they need to be checked. I'll look over the hoses today, it's painful to see the nice weather and be in a hanger.
I found this guy making pumps he claims are the last Rotax pump you will ever need to buy, Has anyone seen these or have any experience with them?
http://www.billetpump.com/home2/home.html
Fuel pumps and regulators for the Aviation Industry — The first "really new" mechanical fuel pump design in more than ten years engineered for the Rotax 912 and 914 engines.
Designed for carburetor, fuel injection, and turbocharger applications. Patented variable displacement design, only flows as much fuel as the engine requires. No diaphragm, valves, rocker arm, block plate, or gaskets. Hardcoated 6061–T6 billet aluminum housing with stainless steel internal parts. Design to be the last Rotax fuel pump you will have to purchase.
United States Patent Number 7,318,416
Re: Forced landing 11/06/11
I believe it's a 1994, aircraft is 1996, books are in hanger at the moment