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#1
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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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