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Z-12 question

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Apr 03, 2019 5:49 pm Post subject: Z-12 question

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
Guest

Posted: Wed Apr 03, 2019 5:57 pm Post subject: Z-12 question

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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