TNS 12/02 British Gliding Association – Technical Committee Technical News Sheet 12/02 Part 1 Airworthiness issues (all categories) 1.1 LET Gliders Details enclosed Order for SB Subscription (Information) 1.2 Glasflugel H301 Libelle AD2003-003, TN 203-3 (Mandatory) Replacement of rudder gimbal drive - rear actuation arm AD details enclosed (German version only, but same as AD 2003-004) 1.3 Glasflugel Club Libelle, Hornet and Hornet C AD2003-004, TN 205-22, 206-21 (Mandatory) Replacement of rudder gimbal drive - rear actuation arm AD details enclosed 1.4 Glasflugel Mosquito & B, Glasflugel 304 AD2003-005, TN 393-23, 304-10 (Mandatory) Replacement of rudder gimbal drive - rear actuation arm AD details enclosed 1.5 Schempp-Hirth Nimbus-3/24.5 All S/No AD2002-357, TN 286-34 (Mandatory) Extension of service life to 12000 hours and supplements of the Maintenance manual AD Details enclosed 1.6 Schempp-Hirth Ventus-2cM AD2002-199/2, TN825-31 (Mandatory) S/n; 44, 46 up to 120. Propeller bearing hub exchange pulley – revision 2 AD details enclosed 1.7 Schempp-Hirth Discus bM AD2002-199/2, TN836-7 (Mandatory) S/n; 1 to 9 Propeller bearing hub exchange pulley – revision 2 AD details enclosed 1.8 Schempp-Hirth Nimbus-4DM AD2002-199/2, TN868-5 (Mandatory) S/n; 1, 3 to 8, 10 to 19 & 21 to 48 Propeller bearing hub exchange pulley – revision 2 AD details enclosed 1.9 Stemme S10-VT AD2002-389, SB A31-10-065 (Mandatory) Gear box 11AG possible failure. Immediate action before flight AD Details enclosed 1.10 SZD 51-1 Junior SB BE-007/92 (Mandatory) Extension of service life to 6000 hours. 1000 hour inspections to be carried out. SB details enclosed 1 Engines: TNS 12/02 1.11 Rotax 912 Series Running modifications SI-25-1997 R4 (Information) 1.12 Rotax 912 A/F/S Series AD 114, SB912-036R1 AD introduces addendum to operators manual AD details enclosed (Mandatory) 1.13 Rotax 914 Series SB-914-017 R1 Checking or replacement of exhaust bend (Mandatory) 1.14 Rotax 914 Series Running modifications SI-25-1997 R4 (Information) 1.15 Rotax 914 F Series AD 114, SB914-022R1 AD introduces addendum to operators manual AD details enclosed (Mandatory) Part 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Modifications Type T61/SF25 LS6/8 Various Various Various Various Discus B Details Mod No Skyflash fin strobe BGA 2002/09 Landing gear down position lock BGA 2002/13 Tail wheel conversion BGA 2002/14 Barograph mounting BGA 2002/15 EW Flight recorder mounting BGA 2002/16 Volkslogger mounting BGA 2002/17 Improved seat back & mounting BGA 2002/18 Contact BGA BGA CP West SVSP SVSP SVSP BGA Part 3 3.1 General Matters Flying Controls “Full and Free” A recent incident where a glider was reluctant to recover from an aerobatic manoeuvre was attributed to the release knob restricting the full movement of the control stick. Another glider, in a quite separate case, had the control stick fouling the underside of the instrument panel due to failed panel mounts. When carrying out Full and Free checks it is imperative that the control movement is unrestricted by seats, cushions, panels or anything else and that one control cannot restrict the operation of an other unless specifically designed to do so. If either of the above abnormality is found either on a DI or by inspection the aircraft must not be flown until rectified. 3.2 Rotax Engine Overcooling Currently under investigation is a potentially expensive problem on Rotax powered Falke Motor Gliders. It appears that the engine in normal flying and soaring operations does not get sufficiently warm to “Boil” off the moisture created in the crankcase. This has resulted in a very expensive repair for one club consisting of a complete overhaul at about 400 hours. It is recommended that the winterisation plate is fitted and the engine is operated with the cowl flaps completely closed or carry out an aerotow if suitably equipped to help remove the water in the oil system. The Rotax engine operators manual states the normal oil temperature operating range is between 90 and 110ºC. Further 2 recommendations will be communicated after discussions with the manufacturer. TNS 12/02 3.3 CAA Airworthiness Notices Now at issue 131. Have you received your update and filed it? You can download from the internet. 3.4 BGA Engine Overhaul Authorisation Please see attached letter clarifying the types of engine the authorisation is applicable to. Compliance Statement: All mandatory inspections and modifications have been included up to the following; Airworthiness Notices, Contents issue 131 Mandatory Aircraft Modifications & Inspections Summary, issue 266 FAA Summary of Airworthiness Directives. Bi-weekly listing 2002-25 Foreign Airworthiness Directives Vol. I and II – CAA Additional Airworthiness Directives, issue 340 Foreign Airworthiness Directives Vol III, issue 350 CAA Mandatory Permit Directives, issue 2002/3 Jim Hammerton Chief Technical Officer 3