Ceengland
Joined: 11 Oct 2020
Posts: 391
Location: MS
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 Posted: Sat Oct 02, 2021 12:15 pm Post subject: Estimates of Component Failure Probabilities |
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On 10/2/2021 12:44 PM, wsimpso1 wrote:
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15 of you have visited this page and not even one of you will share "I have X many hours in little planes and have had Y of this failure and Z of that failure"?
OK, I shall start. In 2200 hours I have had:
Two plugs on one cylinder foul and cut out the cylinder, with the first cutting out only a couple minutes before the second. The Archer maintained altitude on three cylinders;
Two Facet standby electric fuel pumps failed on the ground;
One alternator failure in flight;
One attitude gyro gave up in flight on an instrument training flight in VMC - that made for an interesting flight;
Two vacuum pumps failed - both in VMC;
One fuel pump sending unit lost its float while IMC, causing a divert to the nearest ILS in case the tank really was draining. It wasn't. And;
Miscellaneous light bulbs. They do not seem to be out when checked on the ground. They must burn out during flight.
No inflight battery or contactor or switch issues, near as I can tell from review of the logs, the switches and contactors all have 6700 hours on them. I will look back through the logs on the airplane for other failures.
Come on guys, let's hear your totals and all the things that have broken. A perusal of the log books for repairs won't hurt either.
Billski
Hey Billkski,
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Maybe no one's responded yet because we don't know which bite of that
elephant to take 1st. 
If you're asking for brand recommendations based on reliability, that's
relatively easy; as you know, B&C would be 1st stop.
If you're asking about what's reliable 'enough', no one component is
reliable enough if finishing the flight safely depends on it (excepting
stuff we simply can't, as a practical matter, duplicate).
My 1st bite: your buddy's Bendix plane will need a different electrical
system backup energy capacity from your SDS-injected plane.
Charlie
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