AF256 TEST 1

Minimum radius on a cutout?

1/2"

Major/minor repairs are defined by ______

FAR 43 Appendix A

Any defect, break, or disruption is considered a what?

Stress riser

Round patches are only used when

the direction of stress is not known

After critical loading, genuinely tipped rivets in the SAME row will be sheared in _______ _______________

same direction

Metal fatigue is the result of metal being repeatedly subjected to _________ and ___________ within its __________ __________

stress and relief

elasticity limits

Minimum edge distance is __ times the diameter of the rivet shank

2

Minimum pitch for rivets is?

3 × RD

Structural repair should maintain, not exceed, what?

Original strength

When repairing a small hole in stressed skin, the major consideration in designing the patch should be

the shear strength of the rivet

Repairs involving stringers on the lower surface of a wing are permitted, but more critical in reference to ________ strength

tensile

Negligible damage is not threatening to the

aircraft structure

Patching is to bridge the gap with a

repair

Insertion is ____________ a damaged piece and _____________

cutting out

replacing it

Non repairable is to be

replaced for one reason or another

Aircraft structures such as spars or engine supports that are made from sheet metal may be _________

repairs using approved methods

The factor that determines spacing between rivets is the

Rivet Diameter

Semi-Monocoque stiffness is retained by _________ and _________

longerons and stringers

The monocoque fuselage relies largely on the strength of

skin

Joggles in removed rivet heads would indicate _________ damage or ___________

shear damage or "tilting"

________ damage is the most common failure of a rivet

shear

(L×T×75,000)/S or B

L= Length

T= Thickness

S= Shear -> pick the SMALLEST ONE

B= Bearing -> pick the SMALLEST ONE

This equation solves for ONE SIDE!!!! MULTIPLY TOTAL BY 2 FOR RESULT.

Edge Distance (Universal Head):

2RD -> 4RD

Edge Distance (Countersunk):

2.5RD -> 4RD

Pitch:

3RD -> 10RD

Transverse Pitch:

75% of Pitch (NO LESS THAN 2.5RD REGARDLESS OF ACTUAL PITCH)

CLECO: Silver: ?/32 and what Drill #

Silver

3/32

#40

CLECO: Copper: ?/32 and what Drill #

Copper

4/32

#30

CLECO: Black: ?/32 and what Drill #

Black

5/32

#21

CLECO: Gold: ?/32 and what Drill #

Gold

6/32

10 or 11

OL - 2ED = WD

Overall Length - 2 Edge Distances = Working Distance

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)

SHH: 1/2RD

SHW: 1 and 1/2RD (aka 1.5RD)

thats all

5 Stresses

Bending

Compression

Shear

Tension

Torsion

Primary Structures

Bulkhead

Longeron

Stringer

Formers

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

Always refer to the Maintenance Manual or the Structural Repair manual for the recommended repairs for the aircraft

N/A

You MUST ALWAYS use an approved data when performing a major repair and a Form 337 MUST he filled out and sent to the FAA

N/A