11.2 Flashcards
Airframe Structures
what is fail safe design
when a structural member fails and another component assumes it
longerons carry what loads
primary bending loads
4 main stresses
tension, compression, torsional, shear
2 main types of construction of fuselage
monocoque and semi-monocoque
problem with fail safe
additional weight
classifications of structure
primary , secondary , tertiary
what is primary structure
critical load bearing structure, failure reduces structural integrity
what is secondary structure
not a primary load bearing member, failure doesn’t reduce structural integrity
what is tertiary structure
not a load carrying member, not integral portion of airframe
which area subjected to hoop stress
presssure cabin
components of hoop stress
circumferential and axial
where is pressure load shared in semi-monocoque
between skin and structure
what is safe life
period component failure is highly unlikely
pre treatments on aluminium
anodizing, chemical conversion, wash primer
system to identify location of components
zonal and station identification system
unit of measurement Boeing
imperial inches
unit and measurement airbus
millimetre and centimetre
3 reference planes
vertical axis
lateral or transverse axis
longitudinal
3 Boeing body coordinates
body stations, body buttock lines, body waterlines
body station
vertical plane , right angle to body centreline
what is waterline
horizontal plane at right angle to body station
structural components of a wing
spars, ribs, stringers & skin
method of fastening aircraft structure
solid and blind rivets
where are bolts used
areas of high strength
close tolerance bolt head marking
raised or recessed triangle
pre treatment for steel alloys
cadmium , phosphating, chromium or nickel & silver plating
pre treatment for cres steel
cadmium plating
two types of paint coatings
primer and top coat
type 1 special coating
water repellent
type 2 special coating
heavy duty corrosion preventive compound
what ppe in high or slippery areas
safety harness
