Extra 300/SC, Maintenance Manual

Page: 141 / 250

CHAPTER 51
PAGE 6
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 12. February 2019
51-10-00 INVESTIGATION
51-10-01 Damage Classification
N O T E All damage of composite parts must first be classified
by qualified personnel. In case of doubt with regard to
the classification of damage, if a clear definition of the
extent of damage is not possible, or if a repair of dam-
age inspite of the valid manufacturer documentation is
doubtful, contact EXTRA-Flugzeugproduktions- und
Vertriebs- GmbH.
N O T E Only the Damages Classes 2, 3 and 4 may be repaired
by qualified personnel. In case of Damage Class 1 it
has to be contacted EXTRA-Flugzeugproduktions- und
Vertriebs- GmbH.
According to the Luftfahrt-Bundesamt (Federal German
Aviation Authority) four damage classes are defined:
Damage Class 1:
Large scale destruction requiring a partial reconstruction of
the component or large scale repair. Each destruction over
300 mm diameter and each damage of a spar is a large scale
destruction. EXTRA-Flugzeugproduktions- und Vertriebs-
GmbH has to be contacted prior to repair.
Damage Class 2:
Damage to primary structures and to secondary structures to
the following extent: Holes and fractures extending through
a sandwich component and a scale under 300 mm diameter.
Damage Class 3:
Damage to primary structures and to secondary structures to
the following extent: Small holes or fractures in the external
covering layers, if not accompanied by damage to supporting
layers or internal covering layers.