Mark wrote:

On many (most) aircraft you won't get this straight shot.

Fail wide open is the standard fail safe mode required of certified
A/C. It would be foolish to deviate from this practice. Put a spring
on it.

In Europe the requirement is in Certification Standards 23.1143 (G)
http://www.easa.eu.int/doc/Agency_Mesures/Certification_Spec/
decision_ED_2003_14_RM.pdf

(g) For reciprocating single-engine

aeroplanes, each power or thrust control must be

designed so that if the control separates at the

engine fuel metering device, the aeroplane is

capable of continuing safe flight.

For those on the other side of the pond it is in FAR 23.1143 (G)

http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/
0/4810746BE2224D21852566870070BC62?OpenDocument

Remember, most of the requirements in the certification standards
were written in blood!

Mark Wrathall

What do they mean by safe flight? Does the engine run at the same
speed? Does it
go to wide open? Suppose the spring fails? Does it go to idle? If so
how?

A push pull throttle cable is pretty robust and reliable. Anything can
be designed. We could
add a spring. What do you what it to do?
Paul Lamar

Hans Conser wrote:

 >>>Fail wide open is the standard fail safe mode required of certified
A/C

No problem. Just stick a spring on there. Suppose the spring fails?

BTW the straight push pull rod IS in the right location for 90% of experimental
tractor aircraft INSTRUMENT PANELS. Some use side throttle so that won't work.
In that case you need an S shaped push pull cable.

BTW an Airbus took off at LAX and the engine cowling came off taking out the
flyby wire throttles. Full power. The fuel supply had to be shut off to land.

Paul Lamar
 
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