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Z-12 question

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Apr 03, 2019 5:49 pm    Post subject: Z-12 question Reply with quote

At 10:55 AM 10/15/2018, you wrote:
Quote:
Electrical fire requiring the master switch be selected off?

I also met a C182 that had apparently had a sudden and complete electrical failure at night but don't know the details. It's possible it was the typical "not noticing the alternator has failed until the battery is discharged" but I think all 182s have a warning light for this. Hard to miss at night and would not be sudden.

That's the problem with dark-n-stormy-night
stories. We almost NEVER get to interview
the pilot, the mechanic who serviced the
airplane later, or even the model year of
the airplane.

Until single engine Cessnas starting
getting B&C standby alternators and/or
glass cockpits, I don't think there was
any active notification of low bus voltage.
Just a battery ammeter.

Could be wrong, I've been disconnected
from details of those aircraft for about
40 years . . . BUT . . . I do have access
to a library of service data that would
tell us much about how the airplane
left the factory.

But based on history, I'll suggest that
one or more data points figured into
the story:

*The owner/pilot didn't have a clue
as to how long things were supposed
to run . . . battery only.

*The battery was not periodically
cap-checked to verify battery-only
endurance goals.

*the airplane had no active notification
of low voltage.

*the ship's most useful electro-whizzies
for alternator-out flight were not driven
from an source easily isolated from
devices of lesser importance.

*I'll bet the pilot didn't have hand-
held com/nav equipment in the flight bag.

Have you read a narrative of the pilot's
experience with this event?



Bob . . .


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alec(at)alecmyers.com
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PostPosted: Wed Apr 03, 2019 5:57 pm    Post subject: Z-12 question Reply with quote

Older single engine Cessnas - 182’s included - have an OV voltage trip warning light, but it doesn’t indicate an under-voltage. It’s easy to miss, for instance, a snapped alternator drive belt.
On Apr 3, 2019, at 9:48 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:

At 10:55 AM 10/15/2018, you wrote:
Quote:
Electrical fire requiring the master switch be selected off?

I also met a C182 that had apparently had a sudden and complete electrical failure at night but don't know the details. It's possible it was the typical "not noticing the alternator has failed until the battery is discharged" but I think all 182s have a warning light for this. Hard to miss at night and would not be sudden.

That's the problem with dark-n-stormy-night
stories. We almost NEVER get to interview
the pilot, the mechanic who serviced the
airplane later, or even the model year of
the airplane.

Until single engine Cessnas starting
getting B&C standby alternators and/or
glass cockpits, I don't think there was
any active notification of low bus voltage.
Just a battery ammeter.

Could be wrong, I've been disconnected
from details of those aircraft for about
40 years . . . BUT . . . I do have access
to a library of service data that would
tell us much about how the airplane
left the factory.

But based on history, I'll suggest that
one or more data points figured into
the story:

*The owner/pilot didn't have a clue
as to how long things were supposed
to run . . . battery only.

*The battery was not periodically
cap-checked to verify battery-only
endurance goals.

*the airplane had no active notification
of low voltage.

*the ship's most useful electro-whizzies
for alternator-out flight were not driven
from an source easily isolated from
devices of lesser importance.

*I'll bet the pilot didn't have hand-
held com/nav equipment in the flight bag.

Have you read a narrative of the pilot's
experience with this event?
Bob . . .


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
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