Technical note         Page 1 from 3
                              No. 370-3

         SUBJECT             : Modification of the DG-600 to version
                               DG-600/18

         EFFECTIVITY         : . / .

         ACCOMPLISHMENT      : alternative

         REASON              : The DG-600 may be retrofitted with 18 m
                               wing tip extensions. Due to the necessary
                               technical modifications and the change of
                               the operational limitations the type
                               designation is changed to "DG-600 version
                               DG-600/18".

         INSTRUCTIONS        : 1. Exchange the flight manual against the
                                  flight manual for the version DG-600/18
                                  issued December 1991.

                               2. Alter the maintenance manual DG-600 to
                                  the maintenance manual for the version
                                  DG-600/18 by exchanging the following
                                  pages (issued December 1991):
                                  Cover                                 0
                                  List of amendments                    1
                                  Content                               2-3
                                  Aileron- and wingflap control         9
                                  Massbalance of the control surfaces   15
                                  Code no's of airspeed indicators      35
                                  Placards                        Diagr.7

                               3. Alter the repair manual DG-600 to the
                                  repair manual DG-600/18 by exchanging
                                  the following pages (issued December 91):
                                  Cover                                 0
                                  List of amendments                    1
                                  Content                               2

                               4. Alter the airspeed indicator markings.
                                  End of the green and white arc is now
                                  185 km/h (100 kts) instead of 200 km/h
                                  (108 kts).

                               5. Exchange the data placard in the cockpit
                                  against the data placard for version
                                  DG-600/18.

                               6. Limit the wingflap deflection range to
                                  -10@ up to L, see working instruction for
                                  TN 370-3.

                               7. Remove or deface the marking -15@ on the
                                  placard for the wingflap settings.

                               8. Reinforce the root ribs of the inboard
                                  wings at the wing parting according to
                                  working instruction 1 for TN 370-3.

                                  This reinforcement was already installed
                                  by the factory in the wings from part no.
                                  6-85 on.

                               9. Additional reinforcement with carbonfibre
                                  tape at the receiver for the sparends of
                                  the wing tip extensions  according to
                                  working instruction 1 for TN 370-3.
                                  This reinforcement was already installed
                                  by the factory in the wings from part no.
                                  6-85 on.

                              10. Fit the 18 m wing tip extensions supplied
                                  by GLASER-DIRKS to the inboard wings.
                                  Adjust for and aft play if there is any
                                  by shims according to section 1.10 of the
                                  maintenance manual.

                              11. Execute an inspection on the occasion of
                                  a major modification.
                                  Therefore execute the following items:

                                  a) Inspect instructions 1 up to 10.

                                  b) Execute a weight and balance deter-
                                     mination with 18 m wing span. Write a
                                     new weighing report taking into con-
                                     sideration section 2.4 of the flight
                                     manual.

                                  c) Check if the flaperons move free with
                                     all flap settings and aileron deflec-
                                     tion (rigged with 18 m wing span!).
                                     Therefore push both wings upwards and
                                     downwards at the tips with a load of
                                     appr. 30 daN (66 lbs).

                                  d) Measure the control surface displace-
                                     ments and write a report.
                                     Take into consideration sect. 1.4.2
                                     of the maintenance manual.

                                  e) Write an inspection report with the
                                     following remarks:
                                     Inspection after modification of the
                                     DG-600 to version DG-600/18 accor-
                                     ding to GLASER-DIRKS technical note
                                     370-3.

                                     Part no's of the 18 m wing tip exten-
                                     sions:

                                     right  FRA 618-xxx
                                     left   FLA 618-xxx

         MATERIAL            : Flight manual for the version DG-600/18
                               issued Dec. 1991.

                               Maintenance manual for the version
                               DG-600/18 pages: 0, 1-4, 9, 15, 35, dia-
                               gram 7, issued Dec. 1991.

                               Repair manual for the version DG-600/18
                               pages: 0, 1, 2, issued Dec. 1991.

                               1 pair 18 m wing tip extensions incl.
                               flaperons

                               Working instruction no. 1 for TN 370-3

                               Further material see list in working in-
                               struction no. 1 for TN 370-3.

         WEIGHT AND
         BALANCE             : Execute new weight and balance with 18 m
                               wing span.

         REMARKS             : Instructions No. 1 - 11 are to be executed
                               by the manufacturer or by a licensed work-
                               shop and to be inspected and entered in the
                               aircraft logs by a licensed inspector.

         Bruchsal 4,  date 07.02.92    LBA - approved:
                                       The German original of this TN has
                                       been approved by the LBA under the
                                       date of......... and is signed by
         Author:                       Mr. Fendt. The translation into Eng-
                                       lish has been done by best knowledge
                                       and judgement. In any case of doubt
                                       the German original is authoritative

         Type certification inspector: