| Jan-68 | Inspection of swivel bearing on elevator bellcrank - SN 13 up to and incl. SN25 | 1969 | | |
| Jan-69 | Retro-fitting a retractable undercarriage, SN 1 up to, and incl. SN 35 - Optional | | | |
| 201-1 | Hard core foam in wing shell instead of balsa wood, Standard SN 111 and up | | German | English |
| 201-2 | Airbrakes on lower surface omitted, improvement of airbrakes on upper wing surface. Standard SN 120 and up | | German | English |
| 201-3 | Balsa wood in ailerons omitted, Standard SN 113 and up | | German | English |
| 201-4 | Balsa wood in rudder omitted: Standard SN 160 and up | | German | English |
| 201-5 | Modified airfoil for horizontal tailplane, hard core foam in fin, balsa wood in elevator omitted, Standard SN 182 and up | | German | English |
| 74-323/2 | 201-6 | Inspection of the rudder cables in the area of the S-shaped guides. Replace if damage is found | Every 100 hours or Annually (whichever comes first) | German | English |
| 201-7 | Installation of an anti-collision-light-Optional- | | German | |
| 201-8 | Application of anti-collision-markings in various colour tones. Supersedes TN 201-8 dated 01.05.71 allowing one colour only | 7/1/1971 | German | |
| 201-9 | Use of a different glass cloth for the Ishear webs Standard SN 305 and up | | German | |
| 201-10 | Conversion into model "Std. Libelle 201 featuring waterballast system. the flight manual and of ASI colour code SN 1 up to incl. SN 321 optional | | German | English |
| 201-11 | Conversion into model "Std. Libelle 201 featuring waterballast system. New flight manual, amendment of the ASI colour code. SN 1 up to incl. SN 321 optional, Standard SN 322 and up | | German | English |
| 201-12 | Installation of a waterballast system into model "Std. Libelle 201 B". Optional after accomplishment of TN 201-11 | | German | English |
| 201-13 | Modification of front tailplane attachment fitting. Optional from SN 13 and up, Standard on SN 350 and up | | German | English |
| 201-14 | Tail boom reinforced: Standard on SN 351 and up | | German | English |
| 73-80 | 201-15 | Reinforcement on GFRP main wheel housing. SN 1 up to and including SN392 and 398 | Annual Inspection 1974 | German | English |
| 201-16 | Stronger control cables and cable conduits. After application TN 201-6 becomes invalid | Every 100 hours | German | English |
| 201-17 | Not published | | | |
| 201-18 | Not published | | | |
| 201-19 | Modification of airbrake actuating torque tube. Standard on SN 521 and up | | German | English |
| 75-168 | 201-20 | Reinforcement of guide plates on elevator actuating bracket, all SN | Before 29/2/1976 | German | English |
| 201-21 | Modified airfoil on horizontal tailplane SN 16 | | German | |
| 80-207 | 201-22 | Elevator actuating bracket on lower end of control stick SN 1 up to and including SN 476 | Before 1/11/1980 | German | English |
| 201-23 | Retro-fitting a clg tow release, Optional | | German | |
| 83-207 | 201-24 | Extension of service life limit to 6000 hours | Until 31/3/1984 when reaching 3000 hours | German | English |
| 84-11 | 201-25 | Possible damage of wing structure with water ballast bags installed. Revision of flight manual | Before 1/5/1984 | German | English |
| 87-83 | 201-26 | Replacement of "DIN" control cables by "LN" cables | Before 1/8/1987 | German | English |
| 201-27 | Elevator drive bracket: Possibility of replacement by elevator drive bracket acc. to drawing No. 201-33-4 | | German | English |
| 201-28 | Tow releases: Optional use of model E85 instead of E72/E75 | | German | English |
| 94-265 | 201-29 | Extension of service life limit to 12000 hours | Before 1/10/1984/when reaching 6000 hours | German | English |
| 201-30 | Optional use of winglets | | German | English |
| 96-131 | 201-31 | Inspection of glass fibre laminate on spar stub fitting | Annually | German | English |
| 96-137 | 201-32 | Weights and moments of control surfaces after repair or painting | Before 31/3/1996 | German | English |
| 96-116 | 201-33 | Inspection/replacement of aileron drive shaft | Before 31/12/1996 | German | English |
| 201-34 | Aerodynamic improvement | | German | English |
| 2005-118 | 201-35 | Rudder gimbal drive – rear actuator arm | Before 31/7/2005 | German | English |
| 201-36 | Replacement of airbrake drive gear inside wing, optional | | German | English |
| 201-37 | Installation of Mode-S-Transponder and Transponder Antennas | | German | English |
| | Transponder antenna installation kit | | German | |
| 201-38 | Spar stub fitting | | German | English |
| 201-39 | Aerodynamic improvement SN 499 only | | | |
| EASA AD 2011-213 | 201-40 | Inspection / replacement of elevator control rod in vertical fin (SN 169 & Std. Libelle 203 SN 1 & 2 only) | 30 days, Before 31/12/2012 | German | English |
| 201-40 | Authorised service facilities for TN 201-40 | | German | |
| 201-41 | Optional installation of a 4-inch-wheel with a hydraulic disc brake-system | | | English |
| 201-42 | Optional installation of new winglets | | German | English |
| 201-43 | Optional installation of a new backrest with integrated headrest | | German | English |
