| 301-1 | Additional glass cloth strip in aft fuselage section, SN 6 and up to and including SN 35 | | German | |
| 301-2 | Repositioning of air-brakes, SN 6 and up | | German | |
| 301-3 | Improvement of wing suspension, SN 6 and up | | German | |
| 301-4 | Improvement of air-brake actuating linkage SN 7 and up | | German | |
| 301-5 | Installation of drogue chute (Test with BS 1000) SN 7 only | | German | |
| 301-6 | Installation of elevator trim on LH side of fuselage SN 7 and up | | German | |
| 301-7 | Improvement of swivel bearings from GL12 to GL14 SN 11 and up | | German | |
| 301-8 | Reinforcement of fuselage structure All SN’s | | German | |
| 301-9 | Not published | | | |
| 301-10 | Improvement of gear actuation locking mechanism, SN 11 and up | | German | |
| 301-11 | Modification of airbrake pivoting arm, SN 14 and up | | German | |
| 301-12 | Modification of aileron push-pull rod inside the wing SN 14 and up | | German | |
| 301-13 | Optional installation of a tail wheel | | German | |
| 301-14 | Optional installation of a drogue chute BS1300 | | German | |
| 301-15 | Installation of ground straps, all SN | 3/31/1966 | German | |
| 301-16 | Improved bonding procedure of fuselage, SN 19 and up | | German | |
| 301-17 | Adjustable horizontal stabilizer, SN 20 and up | | German | |
| 301-18 | Change of root rip construction SN 27 and up | | German | |
| 301-19 | Alteration of aileron actuating lever SN 31 and up | | German | |
| 301-20 | Modification of elevator actuation system SN 20 and up | | German | |
| 301-21 | Replacement of fuselage stringers with hollow profiles SN 36 and up | | German | |
| 301-22 | Modification of ailerons SN 42 and up | | German | |
| 301-23 | Installation of cable deflectors on c/g tow release, all SN’s | | German | English |
| 301-24 | Modification of wing Tipps, SN 54 and up | | German | |
| 301-25 | Installation of locking guide for elevator assembly, SN 2 up to and incl. 85 | | German | English |
| 301-26 | Improved elevator actuating bracket, SN 86 and up | Latest 31/8/1968 | German | |
| 301-27 | Wear of rudder control cables in the area of S-shaped guides of rudder pedals | Every 100 hours or annually | German | English |
| 301-28 | Sealing of flap control lever for standard class contests | | | English |
| 301-29 | Color coding scheme: affixing of different/additional colors. German registered sailplanes | | German | |
| 301-30 | Reinforcement of elevator actuating bracket | Before next flight, latest 29/2/1976 | German | English |
| 301-31 | Elevator linkage at base of the control stick | | German | English |
| 301-32 | Extension of service life limit to 6000 hours | 31/3/1984/ when reaching 3000 hours | German | English |
| 87-83 | 301-33 | Replacement of "DIN" control cables by "LN" cables | Every 500 hours | German | English |
| 301-34 | Elevator drive bracket: Possibility of replacement by elevator drive bracket according to drawing No. 201-33-4 | | German | English |
| 301-35 | Tow releases: Optional use of model E85 instead of E72/E75 | | German | English |
| 96-131 | 301-36 | Inspection of glass fiber laminate on spar stub fitting | Annually | German | English |
| 96-137 | 301-37 | Control surface weight and static balance | Until 31/3/1996 | German | English |
| 301-38 | Replacement of airbrake drive gear inside wing, optional | | German | English |
| D-2005-118 | 301-39 | Rudder gimbal drive – rear actuator arm | Until 31/7/2005 | German | English |
| 301-40 | Installation of Mode-S-Transponder and Transponder Antennas | | German | English |
| 301-41 | Spar stub fitting replacement, standardisation of fittings | | German | English |
| 301-42 | Increase of maximum mass | | German | English |
| 301-43 | Optional installation of a 4-inch-wheel with a hydraulic disc brake system | | | English |
| 301-44 | Optional installation of a new backrest with integrated headrest | | German | English |
