The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the
MINIMUM RADIUS OF BEND
Bend radius on sheet metal is INSIDE RADIUS
The setback is THE DISTANCE FROM THE MOLD POINT TO THE BEND TANGENT LINE
Formula for setback for a 90 degree bend is (R+T)
In sheet metal bending, how would you measure the bend radius to calculate the bend allowance?
MEASURE TO THE INSIDE OF THE BEND RADIUS
The shop head of a rivet should ne
ONE AND ONE-HALF TIMES THE DIAMETER OF THE RIVET SHANK
Wrinkling of an aircraft skin will
CAUSE RIVETS TO PULL
The general rule for finding the rivet diameter is
THREE TIMES THE THICKNESS OF THE THICKEST SHEET
AN426 DD 4-6, What is the length of the rivet? 3/8 inch
What is the minimum edge distance for aircraft rivets?
TWO TIMES THE DIAMETER OF THE RIVET SHANK
A control cable is proof loaded to ensure that THE END FITTINGS ON THE CABLE ARE SECURE
When checking cable tensions you are looking for FULL AND FREE MOVEMENT
The best way to check control cables for broken wires is to RUN A RAG ALONG THE CABLE IN BOTH DIRECTIONS
Silver sodering is suited for ELECTRONIC COMPONENT SOLDERING /
If the turnbuckles in a control system are tightened excessively the result will be: THE CABLES WILL EXCESSIVELY AND CAUSE FAILURE OF CONTROLS
Generally speaking, the THINNER a material is, the more sharply it can be bent (the smaller the radius of bend).
FORMING is accomplished by either stretching or shrinking the maerial in a certain area to produce curves, flanges, and various irregular shapes.
In layout and forming, the lengt of the curved portion of the neutral line is known as the BEND ALLOWANCE
Tool use to flare soft copper, aluminum, and brass tubing: ROLLING-TYPE FLARING TOOL
The result of the tubing not being cut sqaurely: CROOKED FLARE
QUIZ #2
The main advantage of dye penetrant inspection is:
THE PENTRANT SOLUTION WORKS ON ANY NON-POROUS METAL
IRON ALLOYS metals are inspected using the magnetic particle inspection method.
Magnetic partcile testing defects faults: TRANSVERSE
When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to: REVEAL ALL POSSIBLE DEFECTS
If after spraying the developer, red blotches appear, the part IS POROUS
Surface cracks in aluminum castings and forgings may usually detected by THE USE OF DYE PENETRANTS AND SUITABLE DEVELOPERS
What is the purpose of the developer in a dye penetrant inspection: IT ACTS AS A BLOTTER TO DRAW OUT THE PENETRANT THAT HAS SEEPED INTO THE CRACK.
A non destructive testing technique which is suitable for inspecting for delamination in bonded structure of light aluminum alloys is: ULTRASONIC
To measure the thickness of a paint finish, What type of NDT inspection is used? ULTRASONIC
The Dwell time of a dye-penetrant NDT inspection is the TIME THE PENETRANT IS ALLOWED TO STAND.
To check the structure of a wing, HIGH VOLTAGE X-RAYS ARE USED.
Defects are indicated in the dye penetrant crack detection test by RED LINES ON A WHITE BACKGROUND.
The testing medium that is genrally used in magnetic particle inspection utilizes a ferromagnetic material that has HIGH PERMEABILITY AND LOW RETENTIVITY.
Ultrasonic flaw detectors use HIGH FREQUENCY SOUND WAVES.
What non-destructive testing method requires little or no part pereparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat-treat conditions?
EDDY CURRENT INSPECTION
Which of these non-destructive testing methods is suitable for the inspection of most metals, plastics and ceramics for surface and subsurface defects? ULTRASONIC INSPECTION
An indication of porosity when using a penetrant dye crack detection method is AN AREA OF SCATTERED DOTS OF DYE.
MAGNETIC-PARTICLE techniques cannot be used on a component manufactured from auestenitic stainless steel.
The pattern for an inclusion is a magnetic particle build-up forming PARALLEL LINES.
ULTRASONIC INSPECTION is suitable for the inspection of most metals, plastics, and ceramics for surface and subsurface defects.
Which of the following NDT methods requires that the orientation (or direction) of the defect be known before the test can commence? MAGNETIC PARTICLE AND ULTRASONIC
When using the colour contrasts NDT: THE SURFACE PAINT SHOULD BE REMOVED.
A deep internal crack in a structural steel member is detected by X-RAY OR ULTRASONIC PROCESS.
A liquid penetrant test cannot LOCATE SUB-SURFACE DISCONTINUITIES.
DYE-PENETRANT NDT method requires that the surface of the test piece is cleaned down to bare metal.
The eddy current method of flaw detection can detect SURFACE FLAWS AND THOSE JUST BENEATH THE SURFACE.
Which is the preferred method of test for aluminum alloy? ULTRASONIC
A CRACK IN A GLASS FIBRE REINFORCED PASTIC COWL defects could not be detected by eddy current NDT inspection. It can detect A crack in magnesium alloy wheen casting and heat damage of a Haynes Alloy turbine blade tho.
X-RAY could be used to detect the rpesence of tiny drops of mercury in a large area of aircraft hull structure after an accident wih a mercury thermometer.
AIRWORTHINESS DIRECTIIVE – medium which the authority notifies aircraft owners and other involved persons of unsafe conditions and prescribes the condition under which the product may continue to be operated.
Materials maybe inspected using the magnetic particle inspection method: IRON ALLOYS
If work performed on an aircraft has been done satisfactorily, the signature of an authorized person on the maintenance records for maintenance or alterations performed constitutes: approval for return to service only for the work performed.
Liquid penetrant inspection methods may be used on which of the following? (2) ferrous metals. (3) nonferrous metals. (5) nonporous plastics.
Magnetic particle inspection is used primarily to detect *
flaws on or near the surface.
An aircraft was not approved for return to service after an annual inspection and the owner wanted to fly the aircraft to another maintenance base. Which statement is correct?
The owner must obtain a special flight permit.
During an annual inspection, if a defect is found which makes the aircraft unairworthy, the person disapproving must provide a written notice of the defect to the owner.
Where is the record of compliance with Airworthiness Directives or manufacturers’ service bulletins normally indicated?
Aircraft maintenance records.
Who is responsible for making the entry in the maintenance records after an annual, 100 hour, or progressive inspection?
The person approving or disapproving for return to service.
Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water?(2) X – ray. (3) Backlighting.
In the tensile strenght test: THE MATERIAL IS PULLED UNTIL IT BREAKS.
An aircraft that is due an annual inspection may be flown IF A SPECIAL PERMIT HAS BEEN ISSUED FOR THE AIRCRAFT.
The maximum time a 100-hour inspection may be extended is 10 HOURS.
A mechanic has complted a bonded honeycomb repair using the potted compound repair technique. What non-destructive testing method is used to determine the soundness of the repair after the repair has cured? COIN RING TEST
Which are all ahrdness testing machines? ROCKWELL, BRINELL, AND VICKERS.
In the Brinell hardness test, you would measure the indention’s DIAMETER
Large airplanes and turbine-powered multiengine airplanes operated under Federal Aviation regulation Part 91, General opearating and flight rules must be inspected IN ACCORFANCE WITH A CONTINUOUS AIRWORTHINESS MAINTENANCE PROGRAM (camp program0) AUTHORIZED UNDER FEDERAL AVIATION REGULATION PART 91, SUBPART E.
For individual (not a repair station) to conduct a complete 100-hour inpection on an aircraft and approv it for return of service requries a mechanic certificate with an AIRFRAME AND POWERPLANT RATINGS.
What type of test involves using a weighted pendelum to strike a material until fracture?
IMPACT RESISTANCE TEST
The impact testing technique is used on a material to test for TOUGHNESS.