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Just read this on Pprune Aviation Safety Digest Library

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Just read this on Pprune Aviation Safety Digest Library

Old 2nd Aug 2018, 15:46
  #1 (permalink)  
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Join Date: Jun 2000
Location: Australia
Posts: 4,054
Just read this on Pprune Aviation Safety Digest Library

Useful lesson for todays flying school instructors teaching ab-initio student pilots. Taken from the revised list of the PPRuNe sticky of Aviation Safety Digests library of yesteryear.

Dear Sir,
Reading 'T~aps for Young Players' (ASD 139),
Trap 1 reminded me of an incident that
occurred several years ago while still a student
pilot. My instructor also used the 'mixture control
to idle/cut off' technique for simulating
engine failure, as I had the habit of keeping my
hand firmly on the throttle to overcome his
annoying habit of constantly closing it.

After a session of solo circuits one afternoon, I
taxied to the apron, parked the aircraft and
commenced the shutdown checks. As I pulled
the mixture to idle/cut off, there was little
resistance and several inches of cable appeared
from the instrument panel. The engine stopped(Just) and I went in search of the Chief
Engineer.
Needless to say, after relating the incident to
my instructor, he never used the same technique
for simulating engine failures. Had the
incident occurred in the training area, it would
definitely have been a case of 'Taking over!'.
Yours sincerely,
Geoff Williams

Simulated is simulated, not 'for real'.
Centaurus is offline  
Old 2nd Aug 2018, 22:12
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Join Date: Nov 2001
Location: Australia/India
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A typical knee jerk, intuitive response instead of a reasoned and informed response to an aircraft defect.

That the supposed ďlessonĒ to be learned from the failure of a component of an aircraft system is to cease using that systemís full functionality is, frankly, bizarre, but so typifies much of the folklore that circulates through GA.

Iíll lay London to a brick that at least 9 out 10 students and their instructors wouldnít know the answer to these questions:

1. On the aircraft youíre flying today, what happens if:

(a) the throttle cable breaks or disconnects from what itís connected to?

(b) the mixture cable breaks or disconnects from what itís connected to?

2. Is the answer the same, no matter what aircraft youíre flying?

I suppose the ďlessonĒ should be a Ďone-size-fits-allí answer: Try to use these controls as little as possible, so they donít break. And whatever you do, donít ever open the cowls before flight to closely inspect whatís under there, after studying and understanding the function and operation of each component. These things never fail and maintenance is always perfect.
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Old 3rd Aug 2018, 15:13
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Join Date: Jun 2000
Location: Australia
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A typical knee jerk, intuitive response instead of a reasoned and informed response to an aircraft defect.
You are right about folklore existing in general aviation. On the other hand to be fair, students and their instructors can only glean this information if they can find it from the appropriate aircraft maintenance manual. They could search around for a local LAME to obtain his opinion but how do they know he is correct or merely offering his opinion and can he quote an approved maintenance document. Or they could Google the question like this:
.https://www.google.com.au/search?sou....0.ahAh1725mp0

It is all too easy to throw stones and there is no shortage of people more than happy to do that on PPRuNe, unfortunately.
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Old 3rd Aug 2018, 19:24
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Join Date: Aug 2007
Location: ON TOP OF OLD SMOKEY
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"Sweet oil and a feather" again old son? (Think I can hear old "Pelvis" gnashing his teeth.)
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Old 3rd Aug 2018, 19:45
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Join Date: Jan 2015
Location: Mars
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Originally Posted by Centaurus View Post
On the other hand to be fair, students and their instructors can only glean this information if they can find it from the appropriate aircraft maintenance manual. They could search around for a local LAME to obtain his opinion but how do they know he is correct or merely offering his opinion
You can glean this information from opening the engine cowlings and following the throttle / mixture cables to the pulleys they're connected to.
​​​​​​
It surprises me a little that the mixture is not spring-loaded to full rich...
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