LBA AD-No.:

TN-No.:

Subject

Urgency

Inspection of swivel bearing on elevator bellcrank
SN 13 up to and incl. SN25

Retro-fitting a retractable undercarriage,
SN 1 up to, and incl. SN 35
Optional

Hard core foam in wing shell instead of balsa wood,
Standard SN 111 an up

Airbrakes on lower surface omitted, improvement of airbrakes on upper wing surface
Standard SN 120 an up

Balsa wood in ailerons omitted
Standard SN 113 an up

Balsa wood in rudder omitted:
Standard SN 160 an up

Modified airfoil for horizontal tailplane, hard core foam in fin, balsa wood in elevator omitted
Standard SN 182 an up

Inspection of the rudder cables in the area of the S-shaped guides
Replacement if damage is found

Every 100h / annually

Installation of an anti-collision-light
-Optional-

Application of anti-collision-markings in various colour tones. Supersedes
TN 201-8 dated 01.05.71 allowing one colour only

Use of a different glass cloth for the Ishear webs Standard SN 305 an up

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

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 an up

Installation of a waterballast system into model "Std. Libelle 201 B".
Optional after accomplishment of TN 201-11

Modification of front tailplane attachment fitting
Optional from SN 13 and up,
Standard on SN 350 and up

Tail boom reinforced: Standard on SN 351 and up

Reinforcement on GFRP main wheel housing
SN 1up to and icncl. SN392 and 398

Annual inspection xxx 1974

Stronger control cables and cable conduits.
After application TN 201-6 becomes invalid

Modification of airbrake actuating torque tube
Standard on SN 521 and up

Reinforcement of guide plates on elevator actuating bracket,  all SN

latest 29.02.1976

Modified airfoil on horizontal tailplane SN 16

Elevator actuating bracket on lower end of control stick SN 1up to and incl. SN 476

latest 01.11.1980

Retro-fitting a clg tow release
Optional

Extension of service life limit to 6000 hours

until 31.3.84 / when reaching 3000 h

Possible damage of wing structure with water ballast bags installed. Revision of flight manual.

until 01.05.1984

Replacement of „DIN“ control cables by „LN“ cables

until 01.08.1987

Elevator drive bracket: Possibility of replacement by elevator drive bracket acc. to drawing No. 201-33-4

Tow releases: Optional use of model E85 instead of E72/E75

Extension of service life limit to 12000 hours,

latest 01.10.1994 /when reaching 6000 h

Inspection of glass fiber laminate on spar stub fitting

Weights and moments of control surfaces after repair or painting

until 31.03.1996

Inspection/replacement of aileron drive shaft

until 31.12.1996

Rudder gimbal drive – rear actuator arm

until 31.7.2005

Replacement of airbrake drive gear inside wing, optional

Installation of Mode-S-Transponder and Transponder Antennas

Aerodynamic improvement SN 499 only

Inspection / replacement of elevator control rod in vertical fin (SN 169 and Std. Libelle 203 SN 1 und 2 only)

30 days / latest 31.12.2012