AIRCRAFT HARDWARE Flashcards
(75 cards)
1
Q
AN
A
Air-force Navy
2
Q
AMS
A
AERONAUTICAL MATERIAL SPECIFICATION
3
Q
AND
A
Air Force-Navy Design
4
Q
AS
A
Aeronautical Standard
5
Q
ASA
A
American Standard Association
6
Q
ASTM
A
American Society for Testing and Materials
7
Q
MS
A
Military Standard
8
Q
NAF
A
Naval Aircraft Factory
9
Q
NAS
A
National Aerospace Standard
10
Q
SAE
A
Society of Automotive Engineers
11
Q
-the most common technique of joining sheets of aluminum is riveting.
- a rivet is any type of fastener that obtains its clamping action by having one of its ends mechanically upset.
- rivets create a union at least as strong as the material being joined.
- a well-designed rivet joint will subject the rivets to shear loads.
A
Rivets
12
Q
the amount of force that is needed to cut a rivet into two
A
Shear Strength
13
Q
the amount of force
that will cause the rivet to tear out from the metal
A
Bearing Strength
14
Q
- Numbering System (AN or MS20 system)
- 3 Digit-Rivet Head Design
- 1or2Digit-AlloyMaterial
- ShankDiameter1/32increments
- Griplength1/16increment
A
RIVET CODE
15
Q
is the total thickness of the material held together by the rivet.
A
Grip Length
16
Q
should be used three times the thickness of the thick sheet
A
Diameter
17
Q
Universal Head – replaces all protruding head designs
A
AN470
18
Q
Round Head – used extensively before 1955
A
AN430
19
Q
Flat Head – Internal Structures
A
AN442
20
Q
Brazier Head
A
AN455
21
Q
Modified Brazier Head
A
AN456
22
Q
Flush Head (Countersunk 100deg)
A
AN426
23
Q
Nonstructural assemblies
A
Rivet Material: A
24
Q
Magnesium alloy parts only
A
Rivet Material: B
25
Boeing Company
Rivet Material: E
26
AKA Field Rivets; requires No Heat Treatment
Rivet Material: AD
27
Icebox rivets – must be completely within 15 minutes after removal from the
freezer or dry ice
Rivet Material : D & DD
28
Corrosion-resistant steel -no head marking
Rivet Material: F
29
Monel - two recessed dimples - used in place of corrosion-resistant steel rivets.
Rivet Material: M
30
Titanium - raised “V” or “T” - used for fastening steel and titanium alloy.
Rivet Material: T
31
1. Do not use a lower-strength rivet alloy as a replacement for a higher-strength alloy unless it is larger than the one that was removed.
2. Enlarged, deformed, or damaged holes should use the next larger rivet size as a replacement.
3. The same degree of countersunk must be used
4. RivetDiameter
Maximum rivet diameter = 3 times the thickness of the thickest sheet
5. Rivet Length = 1.5D+ grip length (thickness of 2 plates)
RIVETS SELECTION
32
-develop the maximum strength from the sheet metal as determined by the amount of load that the sheet metal must carry.
-is a critical factor so the drilled holes do not weaken the joint.
RIVET LAYOUT PATTERN
33
metal sheet will tear out in extreme conditions
Edge distance: too close to edge
34
metal sheet separates; contaminants enter the join causing corrosion for instance (Accepeted practice: 2D-4D)
Egde Distance:too far to edge
35
the distance between adjacent rivets in a row. (Accepeted practice: 3D-12D)
Rivet pitch
36
the distance between rows of rivets in a multi-row layout. (Accepted practice: 75% RP if staggered, RP=TP , If not staggered)
Transverse Pitch
37
safer to use; less chances of electric shock and arcing; motor speed is controlled by varying trigger pressure *start slow- hole forms- use faster speed.
Pneumatic Drills
38
topn sheet thicker than tapered head. (Tool: standard counter sink, microstop countersink (adjustable))
Countersinking
39
a high speed milling tool useful in shaving heads of rivets to obtain accurate flush fit.
Microshaver
40
top sheet thinner than tapered head
Dimpling (hot/cold)
41
it has Forging action
Coin Dimpling
42
it has Folding action
Radius Dimpling
43
is a process that mechanically "dents" the sheets being joined to accommodate the rivet head
DIMPLING
44
Fast, light blow; small rivets
Short Stroke Gun
45
Slow/one shot heavy blow
Long stroke Gun
46
radius of depression in the set must be larger than that rivet head, but not so large that edges of the set contract the surface of the metal.
Rivet Set
47
when rivet is driven, the actual compression of the rivet is the actual compression of the rivet is not performed by the action of the rivet gun, instead, the rivet is backed up by a metal bar that reciprocates in response to the beats of the rivet gun.
Bucking Bar
48
are installed with access to only one end of the rivet
blind rivets
49
an early form of the blind rivet. It cannot replace solid shank rivets size for size and must be at least one size larger in diameter.
Cherry friction-lock rivet
50
useful for temporarily lining up holes; used in some homebuilt aircraft
Pop Rivets
51
designed to prevent the center stem of a rivet from falling out via lock ring as a result of vibration encountered during aircraft operation.
Mechanical lock Rivets
52
first mechanical lock rivet; limited to aircraft manufacturers and large repair facilities
Huck-Lok
53
requires a special pulling tool per size and head shape.
Bulbed CherryLOCK
54
lightweight,spindle-type blind rivet; less expensive, only 3 installation tools are required
Olympic-Lok
55
economical and replaces solid shank rivets size for size; installed by a one-size puller for all sizes.
CherryMAX
56
high-strength and lightweight fastener that can be used in place of conventional AN bolts and nuts. Held in place by a collar, squeezed into position instead of being screwed on like a nut.
SPECIAL FASTENERS
57
for both shear and tension applications
Lock Bolts
58
withstand bearing and shearing loads
Hi-Lok Bolts
59
excellent strength to weight ratio; lighter
Hi-Lite Fastener
60
one-piece fastener made of 2 titanium alloys
CherryBUCK
61
strongest; creates radial and vertical compression
Taper Lok
62
has a bead at the threaded end; preloads the hole to strengthen the joint
Hi Tigue Fastener
63
high strength structural fastener
Jo Bolts
64
threaded rivets; attach rubber deicer boots to aircraft wing and tail surfaces
Rivnuts
65
secure inspection plates, doors cowlings and other removable panels on aircraft.
Turn-lock fasteners
66
- unlike rivets and pins, threaded fasteners may be disassembled and reassembled an almost infinite number of times.
- Aircraft bolts, screws and nuts
THREADED FASTENERS
67
loose fit – fingers only – wing nuts
CLASS OF FIT: Class 1
68
free fit - screws
CLASS OF FIT: Class 2
69
medium fit – aircraft bolts
CLASS OF FIT: Class 3
70
close fit – requires wrench
CLASS OF FIT: Class 4
71
tight fit – requires wrench
CLASS OF FIT: Class 5
72
The hole is larger than the shaft, enabling the two parts to slide and/or rotate when assembled.
Clearance Fit
73
- The hole is fractionally smaller than the shaft and mild force is required to assemble/disassemble
Transition Fit
74
The hole is smaller than the shaft and high force and/or heat is required to assemble/disassemble
Interference Fit
75
