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NTSB report of possible interest printer friendly version
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D. Porter
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Posted Monday, August 10, 2015 @ 05:27 PM  

The NTSB just issued a report on the March 15, 2015 forced landing of Harrison Ford's Ryan PT-22 http://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20150305X93207&key=1 Remember that he landed on a golf course following lose of power on takeoff and suffered moderate injuries.

I noticed two items that might be of interest to us as Fournier owners:

1) The probable cause was "A total loss of engine power during initial climb when the carburetor main metering jet became unseated, which led to an extremely rich fuel-to-air ratio."
"The main metering jet was found unscrewed from its seat and rotated laterally about 90 degrees. The internal cap, main metering jet, and seat appeared to be bright in color and polished. Portions of the jet threads appeared to be rounded off. No gasket was observed within the main metering jet housing. In addition, no evidence of thread locking compound was observed on the threads of the main metering jet or the threads of the seat.

This was not a maintenance or inspection item and had not be inspected since a rebuild in 1998.

2) "The front and rear seats of the airplane were equipped with non-factory-installed shoulder harnesses. The pilot's shoulder harness was installed by mounting the end of the restraint to the lower portion of the seatback assembly, which was made of thin aluminum. No reinforcement material or doublers were installed at or around the attachment bolt hole in the seatback. The lack of reinforcement allowed the attachment bolt, washers, and stop nut to be pulled upward and through the seatback structure during the impact sequence, which resulted in the pilot's loss of shoulder harness restraint.It is likely that the improperly installed shoulder harness contributed to the severity of the pilot's injuries. "

--------------------
Don
RF4D #4054 N1700F Rectimo 1400cc

Bob Grimstead
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Posted Tuesday, April 21, 2020 @ 08:48 AM  

Interesting indeed,

I have only just found & read this, but I've posted somewhere else on this forum about the serious loss of power I experienced when the emulsion tube unscrewed itself from my RF4D's standard Zenith 28RXD carburettor.
There is neither provision, requirement nor need for this or any other carb component to be fitted with thread-locking liquid. The important thing, as with all threads, is to torque it up properly.
The warning symptom is an unusual enriching of the mixture, resulting in black smoke, smoke staining of the fuselage sides behind the exhausts and a gradual loss of power

Most of you will be aware of the sudden & complete engine failure & forced landing caused by the body of a small insect blocking the main jet of the same carburettor. The jets on these carbs are so tiny they are easily blocked.

The third carb problem I've had was a leaking plastic float on my British RF4D's carb. That manifested itself as a gradual and inexplicable richening of the mixture over more than a year before the float eventually sank. I could keep the engine running at full throttle, although it was down on power and belching black smoke, but of course as soon as I reduced power the engine and propeller stopped... which is why I didn't throttle back until I was on short final within safe gliding distance of the threshold.

Just for your general elucidation.

Happy Fournicating, Bob

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Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

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