LISI 2012
33
A more secure access door latch
Several access doors are used during the preparation of an
aircraft for operations such as levels verification and tanks
filling with jet fuel, oil or water necessary for the flight.
Airbus asked us to redesign a water access door latch for
the A330 capable of being actuated more than 25,000
times, providing for secure locking during the flight and
simple and reliable operation on the ground, even in the
most extreme climatic conditions. Appropriate technical
solutions and a campaign of detailed validation against
the functional requirements allowed for the development
of a new secure latch with performances parameters
superior to the ones of the currently used mechanisms.
The decision taken by our customer to retrofit this new
latch in place of the current solution has proven the
benefits provided by our product.
The coatings HI-KOTE® 1 NC and HI-KOTE® 4 NC
on the market
Formulated by LISI AEROSPACE to meet the technical
requirements of threaded fasteners and the most recent
environmental constraints, these coatings are now
qualified and used by the majority of our customers. The
coatings comply with various qualifications requirements
such as the EN4473 standard recognized by European
customers, the BMS10-085 standard for Boeing and theUS
standard NAS4006 which is in the process of being revised
to cover these new coatings. This new coating technology
delivers a significant advantage for the design of high-
performance fasteners, whilst ensuring the functions
of anticorrosion protection for the structure, lubrication
for the threads, conductivity and paint adherence, in full
compliance with the environmental latest regulations.
Integration of complex structural parts thanks
to CREUZET technologies
Forming technologies of aluminum or titanium structural
parts developed by LISI AEROSPACE CREUZET allows for
engineering conventional multiple part assemblies into a
single part of complex forms fulfilling multiple functions.
This method makes it possible for our customers to use
simpler designs with significant savings in weight and
assembly costs. This approach was for example proposed
for the structural beams design of A350 main landing
gear bay. The use of LISI AEROSAPCE CREUZET forming
technology for this major structural part, which is several
meters long, allowed for the simplification of landing gear
bay structure leading to a significant weight and cost
reduction on this aircraft.
Development of titanium profile extrusion
Extruding and forming profiles for aeronautics struc-
tures is a well known and very competitive technology in
comparison to conventional manufacturing processes. It
enables, almost without any material loss, to get closer
to the final geometry of the part and to optimize its grain
flow and mechanical strength. Although it is widely use
for aluminum, the implementation of this technology
for titanium alloys was considered a challenge for many
years. LISI’s Group’s experience in the field of materials and
development of special manufacturing processes allowed
to overcome the difficulties related to the forming of
titanium, thus openingupnewprospects for designing and
producing complex parts in titanium based on extrusion/
forming technology.
Optimized metallic leading edges for composite fan
blades
LISI AEROSPACE CREUZET is the industry leader formetallic
leading edge technology, supplying these parts for years
on various legacy engines such as GE90. Design and
manufacturing of this part which ensures composite fan
blades protection against erosion, birds or hail ingestion is
a real technical challenge. It is the subject to an extremely
complex technical specifications for new-generation
engines such as the LEAP intended to equip the Airbus
A320 Neo, Boeing 373 Max and COMAC C919. On this
type of part, LISI AEROSPACE innovated at the level of the
manufacturing processes, reinforcing the competitive-
ness and technological advancement of the group.
