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EASA AD on FES battery systems



 
 
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  #1  
Old September 8th 17, 05:14 PM posted to rec.aviation.soaring
JS[_5_]
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Posts: 80
Default EASA AD on FES battery systems

Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf

  #2  
Old September 8th 17, 07:37 PM posted to rec.aviation.soaring
Steve Leonard[_2_]
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Posts: 833
Default EASA AD on FES battery systems

On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf


Hmm... I wonder what an approved modification to the battery pack or its installation consists of?
  #3  
Old September 8th 17, 08:23 PM posted to rec.aviation.soaring
JS[_5_]
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Posts: 80
Default EASA AD on FES battery systems

On Friday, September 8, 2017 at 11:37:53 AM UTC-7, Steve Leonard wrote:
On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf


Hmm... I wonder what an approved modification to the battery pack or its installation consists of?


Wondered that too, as the only option listed is to remove the batteries.
Further down the AD are links to manufacturers websites which will hopefully have details.
Jim
  #4  
Old September 11th 17, 02:00 AM posted to rec.aviation.soaring
Andy Blackburn[_3_]
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Posts: 401
Default EASA AD on FES battery systems

On Friday, September 8, 2017 at 11:37:53 AM UTC-7, Steve Leonard wrote:
On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf


Hmm... I wonder what an approved modification to the battery pack or its installation consists of?


What battery chemistry are they using? LiPos?

9B
  #5  
Old September 11th 17, 02:17 AM posted to rec.aviation.soaring
Renny[_2_]
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Posts: 207
Default EASA AD on FES battery systems

On Sunday, September 10, 2017 at 7:00:44 PM UTC-6, Andy Blackburn wrote:
On Friday, September 8, 2017 at 11:37:53 AM UTC-7, Steve Leonard wrote:
On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf


Hmm... I wonder what an approved modification to the battery pack or its installation consists of?


What battery chemistry are they using? LiPos?

9B


Andy - You are correct!
  #6  
Old September 12th 17, 12:17 PM posted to rec.aviation.soaring
Graham Smith
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Posts: 1
Default EASA AD on FES battery systems

from https://members.gliding.co.uk/wp-
content/uploads/sites/3/2017/09/BGA-Newsletter-September-17.pdf

Airworthiness
FES Battery Fires. On 10th August, a FES-equipped sailplane
experienced a severe fire in the forward FES battery after landing
normally at Southdown Gliding Club. The pilot was uninjured and the
fire was extinguished, although the battery compartment and
surrounding structure were damaged by the fire. This event is the
subject of an AAIB Field Investigation and no findings of cause have
yet been established. The AAIB is aware of a second FES battery fire
that occurred on a different FES-equipped sailplane in May 2017, and
is working with the sailplane manufacturer and LZ Design, the
manufacturer of the FES system, to determine the cause of both
battery fires. Whilst the facts have yet to be determined, it is possible
that there could be internal fault within battery cells that could cause
an electrical short between cells and thereby a spontaneous
combustion which battery temperature monitoring will not warn of.
Part of the AAIB work programme involves CT-scanning battery packs
to identify any foreign objects. The potential lack of fire warning is
also being carefully considered.
If you have any questions about operating and maintaining a FES
installation and associated battery, please contact the glider agent in
the first instance.

  #7  
Old September 21st 17, 07:40 PM posted to rec.aviation.soaring
Dan Daly[_2_]
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Posts: 376
Default EASA AD on FES battery systems

On Tuesday, September 12, 2017 at 7:30:07 AM UTC-4, Graham Smith wrote:
from https://members.gliding.co.uk/wp-
content/uploads/sites/3/2017/09/BGA-Newsletter-September-17.pdf

Airworthiness
FES Battery Fires. On 10th August, a FES-equipped sailplane
experienced a severe fire in the forward FES battery after landing
normally at Southdown Gliding Club. The pilot was uninjured and the
fire was extinguished, although the battery compartment and
surrounding structure were damaged by the fire. This event is the
subject of an AAIB Field Investigation and no findings of cause have
yet been established. The AAIB is aware of a second FES battery fire
that occurred on a different FES-equipped sailplane in May 2017, and
is working with the sailplane manufacturer and LZ Design, the
manufacturer of the FES system, to determine the cause of both
battery fires. Whilst the facts have yet to be determined, it is possible
that there could be internal fault within battery cells that could cause
an electrical short between cells and thereby a spontaneous
combustion which battery temperature monitoring will not warn of.
Part of the AAIB work programme involves CT-scanning battery packs
to identify any foreign objects. The potential lack of fire warning is
also being carefully considered.
If you have any questions about operating and maintaining a FES
installation and associated battery, please contact the glider agent in
the first instance.


This is from the LZ Design webpage news section ( http://www.front-electric-sustainer.com/news.php ) :
"September 2017
On Sept 6th 2017, the European Aviation Safety Agency (EASA) issued Airworthiness Directive (AD) number 2017-0167-E. The AD identifies the occurrence of fires in the FES battery packs produced by LZ Design. It is unknown whether the fires are a result of battery internal issues, the specific installations in the affected aircraft, or external conditions such as mishandling.. LZ Design is collaborating with the EASA and also the AAIB from UK with the intent to issue battery inspection procedures and, if necessary, modification instructions."
  #8  
Old October 9th 17, 05:05 PM posted to rec.aviation.soaring
[email protected]
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Posts: 9
Default EASA AD on FES battery systems

Dne ponedeljek, 11. september 2017 03.17.29 UTC+2 je oseba Renny napisala:
On Sunday, September 10, 2017 at 7:00:44 PM UTC-6, Andy Blackburn wrote:
On Friday, September 8, 2017 at 11:37:53 AM UTC-7, Steve Leonard wrote:
On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf

Hmm... I wonder what an approved modification to the battery pack or its installation consists of?


What battery chemistry are they using? LiPos?

9B


Andy - You are correct!



For FES battery packs we are using Li-Ion cells with NMC chemistry (Lithium Nickel Manganese Cobalt Oxide: LiNiMnCoO2. cathode, graphite anode)


http://batteryuniversity.com/learn/a...of_lithium_ion

And why Li-Ion pouch cell are usually identified as LiPo.

http://batteryuniversity.com/learn/a...stance_or_hype

Regards,

Luka
  #9  
Old October 9th 17, 05:14 PM posted to rec.aviation.soaring
[email protected]
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Posts: 9
Default EASA AD on FES battery systems

Dne ponedeljek, 09. oktober 2017 18.05.31 UTC+2 je oseba napisala:
Dne ponedeljek, 11. september 2017 03.17.29 UTC+2 je oseba Renny napisala:
On Sunday, September 10, 2017 at 7:00:44 PM UTC-6, Andy Blackburn wrote:
On Friday, September 8, 2017 at 11:37:53 AM UTC-7, Steve Leonard wrote:
On Friday, September 8, 2017 at 11:14:40 AM UTC-5, JS wrote:
Saw the document on [Aus-Soaring] thanks to John Welsh.
Link to UK site below.
Jim

http://publicapps.caa.co.uk/docs/33/...D20170167E.pdf

Hmm... I wonder what an approved modification to the battery pack or its installation consists of?

What battery chemistry are they using? LiPos?

9B


Andy - You are correct!



For FES battery packs we are using Li-Ion cells with NMC chemistry (Lithium Nickel Manganese Cobalt Oxide: LiNiMnCoO2. cathode, graphite anode)


http://batteryuniversity.com/learn/a...of_lithium_ion

And why Li-Ion pouch cell are usually identified as LiPo.

http://batteryuniversity.com/learn/a...stance_or_hype

Regards,

Luka


Dear fellow glider pilots, FES owners and electric flight enthusiasts, please find link to our letter, regarding recent FES incidents:

http://www.front-electric-sustainer....nthusiasts.pdf

Regards,

Luka
  #10  
Old September 8th 17, 10:23 PM posted to rec.aviation.soaring
2KA
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Posts: 168
Default EASA AD on FES battery systems

I'm guessing that there is no approved modification yet, and that they wrote the AD that they wrote the AD that way so they won't have to reissue it when the approve one. Perhaps the only way to comply for now is to remove the battery?
 




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