Abstract :
An airplane structural strength is depend on its structural design and its
material strength. Horizontal stabilizer is part of the empennage of the airplane that
works to maintain the lateral stability of the airplane. Therefore, the horizontal
stabilizer is very important to maintain the flight stability of the airplane. The purposes
of this thesis are to design the internal structural of the horizontal stabilizer and to
analyse its structural strength of STTA-12 MXA airplane.
CATIA V5R21 is the software that being used to this design and analyse the
horizontal stabilizer structure. The analyse method that being used at this thesis is
structural static analyse by CATIA V5R21 with three conditional loads which are
steady horizontal flight/cruising condition, turning performance/banking at
60°condition, and pull-up manoeuvre condition.
The results from this thesis are the horizontal stabilizer structure configuration
with front and rear spar at 25% and 60% of the chord line, 5 mm of thickness at each
part, four parts of rib structure with 4 mm of thickness at each and 1 mm size of skin
thickness. The maximum stress occur at the rib structure of the horizontal stabilizer
root with 33.6 MPa at steady pull-up manoeuvre condition. The value of margin of
safety at steady level flight/cruising condition is 39.54, therefore the structure is in the
safe condition. The MS value for turning performance condition is 39.92, therefore the
structure is in the safe condition. The MS value for steady pull-up manoeuvre condition
is 9.26 therefore the structure is in the safe condition