| 303-1 US | Deviation of US registered sailplanes from German TCDS | | German | English |
| 303-1 NL | Deviation of Netherland registered sailplanes from German TCDS | | German | |
| 303-2 | Lead ballast compartment in nose bulkhead | | German | English |
| 303-3 | not published | | | |
| 303-4 | not published | | | |
| 303-5 | not published | | | |
| 303-6 | not published | | | |
| 303-7 | not published | | | |
| 303-8 | not published | | | |
| 79-322 | 303-9 | Canopy emergency jettisoning | | German | |
| 84-11 | 303-10 | Venting of the water ballast bags on high altitude flights | before 1/5/1984 | German | |
| 303-11 | Forward hinged canopy (optional conversion as on model "Glasflügel 304") | | German | |
| 88-28 | 303-12 | Elevator drive bracket -Replacement or reinforcement | before 30/4/1988 | German | |
| 88-281 | 303-13 | Extension of service life limit to 6000 hours | before 31/5/89 when reaching 3000 hrs | German | English |
| 303-14 | Ailerons (replacing them in case of a major repair) | | German | English |
| 303-15 | Elevator drive bracket: Possibility of replacement by elevator drive bracket acc. to drawing No. 201-33-4 | | German | English |
| 303-16 | Tow releases: Optional use of model E85 instead of E72/E75 | | German | English |
| 303-17 | Minimum instrumentation (optional) | | German | English |
| 91-111 | 303-18 | Canopy lifting/tilting mechanism | | German | English |
| 303-19 | Modification of brake system to brake disk (foot control) - Optional | | German | |
| 303-20 | Modification of brake system to brake disk (hand lever operated) - Optional | | German | |
| 95-102 | 303-21 | Mass balance of CFRP ailerons | | German | English |
| 2000-318 | 303-22 | Extension of service life limit from 6000 hours to 12000 hours | Before 31/12/2000 when reaching 6000 h | German | English |
| 2003-005 | 303-23 | Rudder gimbal drive -rear actuator arm | before 31/03/03 | German | English |
| 303-24 | Transponder Mode-S | | German | English |
| EASA AD 2011-213 | 303-25 | Inspection / replacement of elevator control rod in vertical fin | 30 Days/before 31/12/2012 | German | English |
| 303-26 | Optional installation of backrest with integrated headrest | | German | English |
| 2018-0143-E | 5-2018 | Deflector-angles at the C.G. release. Usage of connection ring pair meeting LN 65091 | Annual Inspection | German | English |
| EASA.A.241 | 303-27 | Optional modification of the wing tip to operate the sailplane with winglets developed by Glasfaser-Flugzeug-Service GmbH | Optional | German | English |
