記憶度
8問
24問
0問
0問
0問
アカウント登録して、解答結果を保存しよう
問題一覧
1
examples of temporary fasteners ?
1. clecos 2. clamps 3. bolts/nuts
2
what is a spirit level?
instrument placed against a surface to determine wether or not it is level
3
what are toggle clamps?
quick release clamps with high strength, easier and faster to use than C-clamps
4
what happens to the hole after it has been cold worked?
improves fatigue resistance of aircraft structures made from aluminum alloys “improves resistance to cracking”
5
when using the split sleeve cold working process, what is the final step?
“ream hole/ check with gauge” to find final size • use pin-end of combination gage to confirm size
6
can the sleeves be re-used after cold working ?
can’t be re-used
7
how does a hi-tigue fastener cold work a hole during install?
bolts exert “radial compressive forces” onto material surrounding hole during install and thereby cold work fastener hole
8
WHEN DRILLING NEW FASTENER HOLES. THE EXISTING CORROSION PROTECTION IS DESTROYED? (TRUE/FALSE)
True, corrosion protection destroyed
9
“ALODINE AND IRIDITE” HAVE WHAT TYPE OF BASE COATING?
chromic acid based coating •produces chrome conversion coating on aluminum
10
list methods used when applying ALODINE/IRIDITE?
applied by; 1. dipping 2. spraying 3. brushing
11
why do we apply primer after holes have been drilled/ alodined?
protects fastener holes and “increases resistance from corrosion” •ensure primer is uniformly applied to manuals specs
12
why do we heat treat rivets?
so rivets can be driven without damage to aircraft structure and shop head conforms to prescribed dimensions. some rivits are too hard from supplier and must be softened by heat treating.
13
rivet alloy types that are heat treated are?
• 2017 “become hard after 1 hour” • 2024 “become hard after 10 mins”
14
where can you find information, regarding heat treating rivets?
1.“rivet vendors specification” 2. “aircraft manufacturers specification” 3. ASM “American society for metals” •aircraft manufacturer may require vendor to heat treat rivers according to their spec.
15
can rivets be re-heat treated?
yes
16
why do we flap peen metal surfaces?
flap peened to “relieve stresses caused by milling, drilling or machine lathe “ •ensures metal surface able to withstand stress load
17
what stresses are you replacing when shot/flap peening?
replaces tensile stress on surface with a compressive layer. •compressive layer stops fatigue cracks and stress corrosion
18
what are you increasing when you increase flap rotation speed?
increasing the intensity
19
to insure correct intensity, you would perform what kind of test?
perform “Almen” test •Allan gauge/ check block
20
what does an optical / level transit do?
telescope assures the technician the ability to maintain straightness, flatness, plumb and squareness at any given installation. •very accurate
21
when dealing with jigs and holding fixtures, what locating pin should you use? and why?
come in many different shapes and sizes. “tapered tip” are easier for part loading. superior to standard dowel pins
22
what is dimensional tolerance ?
the allowable deviation from a standard distance.
23
the sum of the + and - allowance figures is called?
tolerance
24
what is the min & max edge distance for universal rivets
min 2d -4d max universal
25
what is the min & max edge distance for countersunk rivets
min 2.5D - 4D max countersunk
26
what should the gap/rivet clearance be, between sheets and rivets ?
“zero” •creates loose connection in riveted lap joint, leads to damage or failure of riveted lap joint, affects whole assembly.
27
when chemical bonding, what is the first step?
read MSDS first
28
before bonding, what test can be done to ensure parts are clean?
water break test
29
what is bond line thickness? is it critical?
“joint strength is only as good as it’s weakest points” •will cause uneven stress distribution
30
what is the difference between thermosetting / thermoplastic resin?
thermosetting: cannot be heated and reused again thermoplastic: can be reheated and reused again
31
what are potting compounds? what are they used for?
low density, light weight fillers that resist chip outs and breakouts. bonding potted inserts, void filling, honey comb edge filling
32
when spot welding cadmium plated steel, what PPE do you need?
1. face sheild 2. leather gloves 3. apron 4. safety hat 5. leather boots 6. respirator (depending on fumes)
33
when setting up heat range for a spot welder, is it true; •is it true the “thinner” the material the higher the amperage?
thicker material = higher amperage thinner material = lower amperage
34
what is a weld timer ?
controls the amount of time the current flows into the welding transformer
35
what fastener has a bead on the shank. (bead preloads hole install)
hi-tigue
36
why do we apply corrosion inhibiting primer to fastener holes ?
1. stop metal - metal contact 2. create seperation between fasteners and structure
37
what must be done prior to re-heat treating rivets?
they must be “anodized” before first reheat treatment •prevents intergranular oxidation
38
why is it important to align parts when fitting them?
so that assemblies conform to specifications in drawing or technical information
39
what is the min/max for 1.024” (+.003”, -.002”)
max 1.027 min 1.022
40
the tolerance for the following dimensions 1.021” (+.003, -.004”)
.007”
41
what is the purpose of a stage inspection?
quality control of the overall process. ensures correct procedure are being carried out, “alignment, corrosion protection, proper torque on fasteners”
42
what can happen if rivets are installed “below” minimum edge distance ?
tearing out of material or fatigue cracking
43
what happens if rivets are installed above edge distance?
edges may curl up
44
why do you trim parts?
so that ”parts fit in assembly without stress and distortion”. •edge distances maintained and dimensions and tolerances conform to drawings
45
when marking a sight line on a bend; it is always equal to?
bend radius
46
what is shown in this picture?
plum bob
47
how is a locating pin superior to standard dowel pins for jigs and holding fixtures?
tapered pin is easy for part loading
48
when chemical bonding, what must be done first?
read MSDS first!
49
when performing a water break test, what are we looking for?
“unbroken” WATER sheeting
50
heat amperage important when setting up a spot welder
“welders manual” will include a chart for setting heat/ amperage range for thickness
51
what’s the purpose to check alignment of parts after removal from jigs?
“ensures the parts will fit before they’re installed” (stage inspection) •part must be removed from jigs without damage or loss of alignment to ensure compliance with applicable standards.
52
what are the atmospheric conditions you DO NOT want to weld in?
where atmosphere contains flammable dust, gas or liquid vapours such as “gasoline”
53
why do we coldwork fastener holes?
improves fatigue resistance of aircraft structure
54
what must be done prior to reheat treating a rivet
anodize
55
is the following river universal or countersunk, AN 426 AD 5-5
countersunk
56
properly driven rivet buck tail dimensions
.5D height 1.5D width
57
what is an example of dual dimensioning?
metric / imperial
58
how do you calculate setback
bend radius + material thickness
59
what will a gap in a spot weld cause?
weaken the weld