tubular structure test 1 100%

通報

問題一覧

Who can weld a/c structure?

certified personal, controlled by regulation.

Steel tubing can be repaired at any location? True/false

yes, True

What type of doubler is fabricated to fit over a dent at a cluster?

finger doubler

When repairing structural tubing, what method is recommended? (inner sleeve/or outer)

inner sleeve method

What is allowable gap between original and replacement tubes for welding?

1/8” gap

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

Tubing should be cut at what angle?

30 degree

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

A partial replacement of a tube with an outer sleeve requires more welding than an inner sleeve repair? True/false

True

When the majority of the tubular structure is undamaged it can be used as a reference to maintain alignment? True/false

True

Other methods for checking alignment are?

1. certified jigs 2. manufacturers drawings 3. measure between points of corresponding members that have not been “distorted”

Is it critical to find out from the manufacturer if they carried out a post weld heat treat? True/false

True

What welding process is most common on tubular structure repairs?

tig or (GTAW)

3 steps required before welding are?

1. clean tubular structure 2. proper jig 3. remove defective welds in area

What is the most widely used steel used for structural tubing assemblies?

Chromoly 4130 “high strength, high stress” areas

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

Can welds be filed or ground down? true/false

false, filling removes strength

Can bent tubes be cold straightened? True/false

yes, true. *ensure they don’t crack, not changed in cross section.

Methods used in cold straightening are?

1. bullet 2. forming blocks

All damaged tubing must be checked for alignment and symmetry before and after welding? True/false

True, before and after

Types of paint removal methods prior to welding are?

1. mechanical 2. scotch brite 3. wire brush “steel” 4. sanding 5. soda blasting

Stop drill cracks to what minimum size?

#40

When splicing tubes, repair parts should be what material and thickness?

same material, same thickness

Weld repairs are considered a specialized process controlled by regulation? True/false

True

Engine mount repairs are exposed to what?

“vibration”, high levels of cyclic vibration

Tubular repair splicing involves using repair pieces that fit Inside or outside the original tube diameter

true

fish mouth cuts can be used as an alternative to a split sleeve repair?

true

licensed AMEs are certified to weld?

Licensed AMEs can fabricate and certify tubular repair parts?

yes

steel tubing can be repaired

yes, at any location. unless otherwise noted

what is a doubler fabricated to fit over a cluster called?

finger doubler

a finger doubler can be formed with heat but is easier to form if cool

false, heat is easier

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

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

engine mount repairs may be repaired using previous methods, the preferred method is “____” with ____ diameter tube

splicing, large

are stub axles repairable?

when damage is severe enough to have distorted the entire assembly. it will be considered ?

un-repairable

proper machine setting

DC straight polarity

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

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

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”

prior to removing damage, a thorough inspection is carried out to ensure?

a accurate assessment of amount of material being removed

before inspecting damaged part, what must be done

remove paint and other coatings

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

Before removing any damaged tubes, perform ___ straightening and check _____?

cold, alignment

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

acceptable weld consists of?

1. smooth 2. uniform 3. good penetration

rosette welds controls relative motion of repair parts for welding, generally what size is a rosette weld?

1/4” of tube diameter

only tubular landing gear can be repaired, not “modern” oleo type.

true

spark tests cannot be used to identify a metal?

they can be used to identify a metal

additional ways to remove paint from A/C structure ?

scotch brite, steel wire brush

is it nessesary to look past the initial damage when inspecting?

true

alignment and symmetry checked before or after welding?

after welding, but both should be done

cold straightening is used to minimize material removal?

true

engine mounts and undercarriage are considered critical assemblies?

true

good way to remove corrosion from tubular structure?

soda blasting

is it critical to determine from the manufacture if a post weld heat treat was carried out?

true, it is critical

when repairing tubing by splicing, which method is recommended?

inner sleeve

tubular repair splicing involves using repair pieces that fit “inside” or “outside” original tube diameter?

true

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