AF256
5 Stresses
Bending Compression Shear Tension Torsion
CLECO: Black: ?/32 and what Drill #
Black 5/32 #21
CLECO: Copper: ?/32 and what Drill #
Copper 4/32 #30
Major/minor repairs are defined by ______
FAR 43 Appendix A
CLECO: Gold: ?/32 and what Drill #
Gold 6/32 10 or 11
Structural repair should maintain, not exceed, what?
Original strength
OL - 2ED = WD
Overall Length - 2 Edge Distances = Working Distance
CLECO: Silver: ?/32 and what Drill #
Silver 3/32 #40
Minimum radius on a cutout?
1/2"
MS20426
100 degree countersunk solid rivet
Minimum edge distance is __ times the diameter of the rivet shank
2
what is the minimum edge distance for aircraft rivets
2 times the diameter of rivet shank
what is the minimum pitch for single row of rivets
3 times the diameter of rivet shank
How many MS20470 AD-4-6 rivets will be required to attach a 10 x 5 inch plate, using a single row of rivets, minimum edge distance, and 4D spacing?
5
Transverse pitch
75% of the pitch
RIVET ALLOYS
A 1100 Aluminium (PLAIN) B 5056 Magnesium (CROSS) AD 2117 Alum Alloy (DIMPLE) D 2017 Alum Alloy (RAISED DOT) DD 2024 Alum Alloy (2 RAISED DASHES)
MS20470
A universal head rivet.
what is negligible damage
air worthy still
Repairable by Patching
any damage that can be bridged
which statements are true about stress risers
any defect in metal can increase stress
Shallow scratches in sheet metal may be repaired by
burnishing
Non-repairable Damage
components must be replaced
a factor that determines the minimum space between rivets is the
diameter of rivets being used
what are the 5 steps for damage repair
estimate the size and type of repair, find the size and type of rivet, inspect corrosion and load damage, load damage
an octagon patch is preferred cause it distributes the structural loads evenly
false
it is required doing a structural repair that it must be stronger
false
Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded
if genuine rivet tipping has occurred groups of consecutive rivet heads will be tipped in the same direction
Which part(s) of a semi-monocoque fuselage prevent(s) tension and compression from bending the fuselage?
longerons and stringers
Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually
permitted but more critical to strength in tension
repairable by insertion
removal of damaged metal and splicing
Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally
repairable using approved methods
what is the definition of metal fatigue
result of the metal being repeatedly subjected to periods of stress
When inspecting a metal wing for critical loading, look for _______ ________. This is when groups of rivets in the wings have their heads ________ in the same direction
rivet tipping tipped
________ damage is the most common failure of a rivet
shear
Joggles in removed rivet shanks would indicate partial
shear failure
the monocoque fuselage relies on the strength of
skin or covering
when repairing a small hole on metal-stressed skin the major consideration in the design of patch should be
the shear strength of riveted joint
