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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. |
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