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On Saturday, March 24, 2018 at 4:00:07 AM UTC-7, Jim White wrote:
When I wanted to install LiFeP04 batteries in my 27, I asked the factory and Uli Kramer's response was as follows: "in principle we have approved these batteries with TN 2-2008 (attached): “3. Parts not belonging to the Minimum Equipment • Electric equipment and its aerials may neither in themselves nor by their mode of operation or by their effect upon the operating characteristics of the sailplane and its equipment constitute a hazard to safe operation. Every electric equipment has to be checked for reciprocal influence by systematically turning off and on and operating all other instruments. The equipment and its control and monitoring devices must be arranged so as to be easily controllable. Their installation must be such that they are sufficiently ventilated to prevent overheating.“ So a battery is also an electric equipment….. Kind regards Uli" TN 2-2008 applies to all Schleicher gliders. Jim The ASH26e Maintenance Manual, section 2.8 states that EITHER the YUASA (or= similar) or the Sonnenshein Dryfit A212 may be used. Nowhere does it say O= NLY a gel cell battery is permissible. Speaking as an electrical engineer, = I consider the Odyssey PC680 to be "similar" to the YUASA in form and funct= ion. The LiFePO4 definitely is not and should necessitate a 337 STC for cer= tificated gliders like mine, not to say that it can't be done. Tom As neither the engine nor it's battery is required equipment in an ASH26, it appears the TN2-2008 allows the installation of an LFP starter battery, provided it meets the other requirements of TN2-2008 (which it does). |
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