“Shunt screws replacement kit” consist of two steel screws (with 3/8″ – 16 UNC thread) and two “schnorr” safety spacers.
Background:
On a few FES gliders, some originally installed screws – from brass material torn off in a few cases, possibly due to excessive tightening torque or material issue.
To make this screw connection more robust and reliable, Schempp-Hirth issued Technical Notes: TN 627-8, TN 825-59, TN 863-26 for Discus 2c FES, Ventus 3 FES and Ventus 2cxa FES, with relevant Working Instructions.
On 22.April 2024, EASA issued SIB (Safety Information Bulletin) No.: 2024-07, about this issue.
We would like to encourage to replace two original brass bolts on all FES glider types!
During replacement, use small amount of thread-locker adhesive Loctite 243 or similar on thread of new screw. Use 14mm size key and apply 17Nm of torque for tightening.
More detailed instructions for non EASA certified FES gliders can be downloaded here.
