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問題一覧
1
Who can weld a/c structure?
certified personal, controlled by regulation.
2
Steel tubing can be repaired at any location? True/false
yes, True
3
What type of doubler is fabricated to fit over a dent at a cluster?
finger doubler
4
When repairing structural tubing, what method is recommended? (inner sleeve/or outer)
inner sleeve method
5
What is allowable gap between original and replacement tubes for welding?
1/8” gap
6
Maximum allowable dent / punctures that can be repaired with a welded patch is?
1. not larger than the tube diameter 2. no more than 1/4” of tube circumference max
7
Tubing should be cut at what angle?
30 degree
8
What are some examples of aircraft parts that are not repairable by welding unless instructed by the original manufacturer?
1. Forging 2. Castings 3. machined part 4. shot peen parts 5. brace wires and cables 6. brazed and soldered parts 7. heat treated parts
9
A partial replacement of a tube with an outer sleeve requires more welding than an inner sleeve repair? True/false
True
10
When the majority of the tubular structure is undamaged it can be used as a reference to maintain alignment? True/false
True
11
Other methods for checking alignment are?
1. certified jigs 2. manufacturers drawings 3. measure between points of corresponding members that have not been “distorted”
12
Is it critical to find out from the manufacturer if they carried out a post weld heat treat? True/false
True
13
What welding process is most common on tubular structure repairs?
tig or (GTAW)
14
3 steps required before welding are?
1. clean tubular structure 2. proper jig 3. remove defective welds in area
15
What is the most widely used steel used for structural tubing assemblies?
Chromoly 4130 “high strength, high stress” areas
16
What are the common NDT methods used for inspecting welds?What are the common NDT methods used for inspecting welds?
1. LPI 2. magnetic particle inspection 3. radiography
17
Can welds be filed or ground down? true/false
false, filling removes strength
18
Can bent tubes be cold straightened? True/false
yes, true. *ensure they don’t crack, not changed in cross section.
19
Methods used in cold straightening are?
1. bullet 2. forming blocks
20
All damaged tubing must be checked for alignment and symmetry before and after welding? True/false
True, before and after
21
Types of paint removal methods prior to welding are?
1. mechanical 2. scotch brite 3. wire brush “steel” 4. sanding 5. soda blasting
22
Stop drill cracks to what minimum size?
#40
23
When splicing tubes, repair parts should be what material and thickness?
same material, same thickness
24
Weld repairs are considered a specialized process controlled by regulation? True/false
True
25
Engine mount repairs are exposed to what?
“vibration”, high levels of cyclic vibration
26
Tubular repair splicing involves using repair pieces that fit Inside or outside the original tube diameter
true
27
fish mouth cuts can be used as an alternative to a split sleeve repair?
true
28
licensed AMEs are certified to weld?
No
29
Licensed AMEs can fabricate and certify tubular repair parts?
yes
30
steel tubing can be repaired
yes, at any location. unless otherwise noted
31
what is a doubler fabricated to fit over a cluster called?
finger doubler
32
a finger doubler can be formed with heat but is easier to form if cool
false, heat is easier
33
forgings, castings, machined and shot peened parts can be repaired by welding without approval from original manufacture? True or False
false. must have manufactures approval
34
splicing using larger diameter replacement tubes requires the ___ amount of cutting & welding. this method ____ be used near clusters or areas requiring original diameter tube for bracket mounting.
Least, Cannot
35
engine mount repairs may be repaired using previous methods, the preferred method is “____” with ____ diameter tube
splicing, large
36
are stub axles repairable?
no
37
when damage is severe enough to have distorted the entire assembly. it will be considered ?
un-repairable
38
proper machine setting
DC straight polarity
39
prior to installing a doubler or sleeve, all tubes should?
1. have dents removed by clamping between suitably shaped blocks or using a bullet drawn through the tubes 2. straightened using clamps, supports and blocks
40
dents not deeper than ___ “ of tube diameter not involving more than 1/4 of tube circumference or not ____ than tube diameter may be cold straightened
1/10” , Longer
41
if a suitable jig is not available, it is possible to use an un-damaged assembly such as an _____ as a pattern to fabricate a jig.
engine mount, *method not recommended for a one off repair due to cost”
42
prior to removing damage, a thorough inspection is carried out to ensure?
a accurate assessment of amount of material being removed
43
before inspecting damaged part, what must be done
remove paint and other coatings
44
once extent of damage has been determined then processed to make a cut in the middle member that is going to be spliced. what does this do?
removes load from members that will be cold straightened
45
Before removing any damaged tubes, perform ___ straightening and check _____?
cold, alignment
46
before fabricating any repair parts for tubular structure, you must be able to positively identify the original material. how can you identify original material?
1. SRM 2. manufacturers specific approval 3. metallurgical lab analysis
47
acceptable weld consists of?
1. smooth 2. uniform 3. good penetration
48
rosette welds controls relative motion of repair parts for welding, generally what size is a rosette weld?
1/4” of tube diameter
49
only tubular landing gear can be repaired, not “modern” oleo type.
true
50
spark tests cannot be used to identify a metal?
they can be used to identify a metal
51
additional ways to remove paint from A/C structure ?
scotch brite, steel wire brush
52
is it nessesary to look past the initial damage when inspecting?
true
53
alignment and symmetry checked before or after welding?
after welding, but both should be done
54
cold straightening is used to minimize material removal?
true
55
engine mounts and undercarriage are considered critical assemblies?
true
56
good way to remove corrosion from tubular structure?
soda blasting
57
is it critical to determine from the manufacture if a post weld heat treat was carried out?
true, it is critical
58
when repairing tubing by splicing, which method is recommended?
inner sleeve
59
tubular repair splicing involves using repair pieces that fit “inside” or “outside” original tube diameter?
true