Mailing List lml@lancaironline.net Message #66862
From: Hamid Wasti <hwasti@lm50.com>
Subject: Re: [LML] Re: iPad overheated & quit!
Date: Sat, 07 Sep 2013 16:16:36 -0700
To: Lancair Mailing List <lml@lancaironline.net>
On 9/7/2013 10:07 AM, Paul Miller wrote:
unfortunately,  this post adds little meat to either argument.....

If its good enough for American Airlines then I'm probably ok too.
Now that is an example of a content free statement. Lets review what you actually know.

An article in a non-technical publication states that an airline is using iPads as "electronic flight bags" and publishes a picture of a person dressed as a pilot sitting in an airline cockpit (or its mockup) holding up an iPad.  What does that tell you about your using an iPad for in-flight navigation in your Lancair? Absolutely nothing.

Do you know if the airlines are just clipping the iPads where the used to clip approach plates or are they mounting them on a purpose designed mount with an integrated cooling fan or maybe even a thermoelectric cooler?

Are they using a stock application or do they have a custom application that takes over everything, does not allow anything else to run to reduce power consumption & increase reliability and starts giving warnings of impending shutdown well in advance?

Depending upon how much support they got from Apple, they may even have access to advanced capabilities like clock throttling, shutting down extraneous hardware and other advanced means to reduce power consumption that Apple may not have made available to the general development community. Do you know if that is the case?

Did they just buy 8,000 iPads and issue them to their pilots or did they buy 16,000, 32,000 or even 80,000 iPads and screen them for performance in extreme conditions and keep only the 8,000 "unmodified" units that were actually screened to perform outside the design specification?

The article did not touch any of those issues and you look rather silly advocating that anyone can "use an iPad just like the airlines do" without knowing what the airline are actually doing. Which leads to your comment:
  Why don't you send your estimate of reliability to AA for a comment?  Unless you know more than the airline does...
There is no reason to comment to the airline because we do not know what they are doing. We only know what you are proposing and that is why all the comments and criticisms of your plan are directed at you.

Finally, here's something we do know. The airline's environment is an air conditioned cockpit with much less exposure to the sun than you do in the L-IV or 3 series.  When it comes to a piece of hardware shutting down due to heat, those differences alone make a huge difference. Heat also accelerates aging. As a rule of thumb, each 10C increase in temperature reduces the life expectancy of electronics components by half.

Until you know all these details and are able to replicate what the airline is doing, you are just comparing apples to paperweights (pun intended).

Regards,

Hamid
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