Volume 1, Unit 5 Flashcards
Why shouldn’t you use a greasy tool?
Tool could slip out of your hand and cause damage
Why shouldn’t you put tools in your pockets?
Increases chances of losing them/ chances of getting injured
At what times should your toolbox be inspected?
Before and after: shift, moving the box, using the box
What should you check for when inspecting your toolbox at the beginning of each shift or before leaving the tool crib section?
Missing, corroded, damaged, dirty tools or FOD
What should you do with your toolbox when it is not in use? Why?
Locked and secured to a fixed object. This way neither the toolbox nor any of its contents can be stolen
What can you use when your toolbox isn’t located within an arms reach?
A toobag
How is the torque value of a wrench expressed?
Inch lbs or Foot lbs
What is the most common type of torque wrench used in the AF?
Breakaway
How do you reduce the torque setting on a torque wrench?
Turn the grip counter clockwise
If you drop a torque wrench, what action must you take?
Re-calibrate with a torque wrench tester
If a bolt or nut cant be tightened to a convenient locking position without exceeding the max. torque value, what should your do?
Replace the bolt or nut
What formula do you use to determine the correct torque setting for the torque handle?
S= TxLa/(La+Ea) Where S= handle setting T= torque applied at the end of adapter La= Length of handle in inches Ea= Length of extension in inches
For what purposes should you use a thickness gauge?
Measuring Clearance between two surfaces
When using the thickness gauge to check the gap between two surfaces what important point regarding accuracy should you always remember?
The accuracy of the gauge will depend on one’s ability to determine by feel when there is the correct tension or pressure on the blades
What are the parts of an outside micrometer?
Frame, anvil, spindle, barrel, lock, vernier scale, and thimble
What are the tree basic types of micrometers and their purposes?
Outside micrometers - measure outside diameters
Inside Micrometers, to measure inside dimensions
Depth Micrometer- Measures depth of holes or recesses
What is the longest calibrated movement possible between the spindle and anvil of a six-inch outside micrometer; and what is this movement called?
1in; the range
List four of the precautions you should take when using a micrometer
Do not close micrometers too tightly on the work; never swing it back-and-forth by the thimble; always hold the frame stationary and adjust the tool by turning the sleeve; before use clean the micrometer and the surface being measured; do not handle large micrometers roughly; and during cold-weather use a cloth to prevent heat transfer between your body and the micrometer
Which other measuring tool can you use while practicing with the micrometer to aid you in becoming proficient in using the micrometer?
The feeler gauge
How many revolutions would you have to turn the thimble of a micrometer to read .025 of an inch?
1
Which part of the micrometer has graduations that represent tenths of an inch?
The revolution line of the barrel
What measurement does the vernier scale on the micrometer provide?
Ten thousandths
What type of device is a dial indicator?
A mechanical motion amplifying device
What feature is common to all dial indicators?
The ability to greatly amplify movement
With two indicators within one dial face on dial indicators, what does the smaller inset indicator measure?
It counts the number of revolutions of the main hand
What is the single greatest assurance against excessive wear, breakage, and other damage to measuring tools?
A careful user
What element is the most prevalent cause of excessive wear of measuring tools?
Dirt
What should you apply to steel measuring tools that are stored in a shop area having a high relative humidity?
Corrosion preventing lubricating oil
When cleaning measuring tools, what type of solvent should you use?
Dry cleaning solvent
Which control switch on the Fluke 8250A multimeter is used to set the meter to check for alternating current, direct-current, and ohms?
The function selector rotary switch
Which control switch is used to take measurements in a circuit that’s difficult to reach?
Hold push button
On what side of the circuit is the black test lead connected?
on the negative side
Where are the measurement results displayed on the meter?
On the digital display
What do the letters OL indicate on the display?
The input into the meter is over the range being used or the circuit is an open circuit
What is the most important safety precaution to observe when using the ohms function of the multimeter?
Do not hook and ohmmeter to a live circuit
How is the multimeter connected to a component that’s to be measured?
connect the black test lead to the negative side and the red test lead to the positive side
When using a multimeter, what safety precautions must be followed?
Inspect leads for damage; check continuity; select proper function; use only one hand in taking measurements, avoid working alone, and keep your fingers on the insulated portion of the probe
What is the maximum voltage that can be measured if the decimal point is at 300 on the digital display?
320 volts
What is the purpose of the borescope inspection?
To perform visual inspection of the internal sections of an assembled engine
What are some limitations of the borescope?
Is not intended to take the place of, or be as thorough as, a periodic teardown inspection. Other limitations include access ports available, serviceability of equipment, and experience and knowledge of the person performing the inspection
What types of borescopes are used on today’s engines?
Rigid, flexible, and videoimage
The rigid and flexible borescope control units are similar except for what?
The rigid control unit doesn’t have an angulation lever because the tip does not bend
What types of views are available with the distal tip of the rigid borescope?
Direct or lateral
What factors determine whether or not someone is capable of becoming qualified to operate a borescope?
Experience, maturity, and rank
What type of damage results from a pinched fiber bundle or light guide cable?
Damaged fibers which cause a poor field of view and are very expensive to repair
Where are bolt markings located?
On the head of the bolt
Where’s the diameter of a bolt measured?
On the grip
Why are fine thread bolts stronger than course thread bolts?
Because they have a greater cross-sectional area
Into what two general groups are nuts divided?
Self locking and non-self locking
What type of nut requires an auxiliary locking washer?
A plain nut
What type of nut has the locking feature built in?
Self locking nut
What type of nut should have a minimum of two bolt threads protruding?
Plain nut
What type of nut is identified by nylon material in the collar?
Nonmetallic nuts
What type of nuts locking force is obtained when the bolt forces threads into a round shape?
A metallic nut
What is the maximum safe working temperature for nonmetallic self locking nuts?
250°F
Which screw is made from high tensile material?
Structural screws
Which screw is used for general purposes?
Machine screws
What are the four types of machine head screws?
Roundhead; Flathead; fillister; and socket
Whatever washer is used to prevent corrosion?
A plain washer
What type washer is used on grooved shafts?
A tab type washer
What type of washer prevents fluid leakage?
A sealing washer
How do lockwashers secure bolts and screws?
Through the use of spring action and sharp tempered edge
In aircraft maintenance, what are the more commonly used pins?
Tapered; Flathead; cotter; roll; quick release
What type of pin is used in joints that carry shear loads and where the absence of clearance is essential?
Tapered
What type of pin is used in conjunction with a cotter pin or safety pin?
A flathead pin
How many times may you use a cotter pin?
Never
What is the purpose of safetying devices?
To maintain proper torque
When lock wiring two bolts together, between what position should the wire twist begin on the first bolt?
Between the three and 6 o’clock positions on the first unit and nine and 12 o’clock positions on the second
How many twists should be left on the braid when cutting off excess locking wire?
Enough to safely bend pigtail
What advantage does steel tubing have over aluminum tubing?
It will withstand rough handling and high-pressure
Why are flexible hose assemblies used instead of metal tubing in some applications?
To carry Fluids where a greater amount of flexibility and a better ability to withstand vibration are necessary
Why should the bend radii on hoses be as large as possible?
To avoid kinking of the line
What is used to identify hose and tubing systems after installation?
Color-coded bands
What size fitting should be used for piece of tubing that is 5/8 an inch?
10
What types of connectors can be used in any system no matter what the pressure is?
Flared, sleeve, or swage types
What causes most nicks and scratches on engine plumbing?
Careless tool handling
How should dust caps be installed on open lines?
Over the tube ends
What is the allowable limit for a dent in a straight line?
20% of tube diameter, Unless it is on the heel of the short bend radius
What is the maximum distance a hose can go without support?
24 inches
What is the purpose of leaving 1 1/2 inches of slack in a hose that connects to an engine component?
It prevents the possibility of the hose being pulled off the connection due to engine movement
You should wear eye protection when you work…
With tools that may cause flying particles
What would you use to hold your tools when you cannot locate your toolbox within arms reach?
A tool bag
Which technical order covers calibration procedures for torque wrenches?
33K-6 series
If you must torque a sequence of three or more bolts…
Use a staggered sequence
If you were tasked to measure the clearance between two surfaces, what type of gauge would you use?
A thickness gauge
The longest calibrated movement between the spindle and anvil of an outside micrometer is?
1 inch
The vernier scale on a micrometer is used to read measurements in
Ten thousandths of an inch
What feature Is common to all dial indicators?
The ability to amplify movement greatly
What should you use for cleaning measuring tools?
Dry cleaning solvent
If the input into the Fuke 8025A meter is over the range being used what will the digital display show?
OL
How many range settings can be used to measuring voltage with the Fluke 8025A?
Four; 3, 30, 300, and 1000
What is the maximum voltage that can be measured if the range button is set at 30 on the Fluke 8025A multimeter?
30
Light is transmitted to the tip of a borescope by
Fiber optics
What are the types of use available with the rigid borescope?
Direct and lateral
When operating a borescope, what part of the borescope illuminates the interior of the area you’re inspecting?
The distal tip lightguides
Which type of borescope misuse causes a poor field of view (black spots)?
Application of lateral (pinching) pressure to the fiber bundle
What type of boat should be used where shearing stress occurs?
Clevis
Do not use self locking nuts on
Engine joints
Which nuts should never be used in areas where the temperature exceeds 250°F?
Nonmetallic self locking nuts
What type of pin is used in joints that carry shear loads and where the absence of clearance is essential?
Tapered pins
Cotter pins are used for safetying various units such as
Castellated nuts
When lock wiring, how many twists per inch are required to produce the proper stiffness?
8 to 10
You can identify the various system lines used to transfer fluids and gases on jet engines by
The color-coded bands placed around the tubing or hoses
What numerical value is given to a fitting used on tubing that measures 3/8 of an inch?
6
