CDC VOL 1. Flashcards
Who is responsible for safety?
Everyone.
What part of the AFTO Form 244 contains the NSN?
Part I.
What part of the AFTO Form 244 contains the type of inspection due?
Part III.
What is part IV of the AFTO Form 244 used for?
The supervisory review of the forms.
What TO gives information on equipment forms documentation?
TO 00–20–1.
What items do you look for when inspecting a hammer prior to use?
The handle for nicks, splits, or being broken; the hammerhead face for nicks, mushroomed areas, or burrs; additionally, ensure the hammerhead is securely attached to the handle. Finally, ensure the hammer’s face is clean.
What are the included angles for the points of prick punches and center punches?
60 degrees for prick punches; 90° for center punches
How do you select the size of the drive punch you need to remove a bolt or a pin?
Select one closest in diameter to the bolt or pin you’re trying to remove
If you’re going to sharpen a chisel to cut a piece of C steel, what should be the included angle of the cutting edge?
Seventy degrees.
What procedure should you follow when using an adjustable wrench to tighten or loosen a bolt?
Always turn the wrench in the direction of the adjustable jaw
What are the sources of power for powered hand tools?
Air (pneumatic), battery, or electrical power.
What is the safe air pressure for operating a pneumatic drill?
90 to 110 psi.
How do you keep a pneumatic drill motor lubricated?
Put a drop of oil in the air intake about once a week
What can happen if a grinding wheel becomes damaged during use? How can you protect yourself and others from personal injury if this occurs?
The wheel can disintegrate while you’re using it. Wear goggles and a face shield, and use protective shields or curtains around the grinding area to protect other personnel in the shop.
Why don’t you use a grinder on or near an aircraft?
fire hazard produced by sparks during operation
How is the proper cutting pressure obtained with a portable band saw?
By using the weight of the portable band saw
What determines the cost of a surface plate?
Size and accuracy.
How do you place heavy parts or tools on a surface plate?
By setting them on the edge and sliding them into position.
The gage blocks you are most likely to use in the shop are manufactured within what tolerance?
A thickness tolerance between +0.000010-inch and –0.000006-inch.
How do you select gage blocks when you’re setting them up for a dimension?
Begin by selecting the thicker blocks first; then, add thinner blocks until you get the correct dimension. Try to use as few blocks as possible.
Why don’t you touch the gaging surface of the blocks with your bare hands?
Moisture from your hands can cause the gage blocks to corrode.
What is the pitch of the spindle screw on an outside micrometer?
Forty threads per inch.
How many thousandths of an inch does the spindle move if it is revolved three complete turns?
0.075.
On a micrometer, what part of an inch does each graduation on the vernier scale represent?
0.0001.
What effect can dust and grit have on a micrometer?
They can cause play to develop or the spindle to bind in the barrel
How does the “0” reading on a depth micrometer differ from the “0” reading on an outside micrometer?
A “0” reading on a depth micrometer has all the graduations on the barrel exposed, while the “0” reading on an outside micrometer requires all the graduations on the barrel be covered.
What part of a depth micrometer is subject to damage if held incorrectly?
Extension rod
What can result from installing dirty extension rods on inside and depth micrometers?
Micrometer damage and erroneous readings.
Why is a vernier caliper more versatile than a micrometer?
One vernier caliper can replace several sets of micrometers. Additionally, the vernier caliper is capable of making both inside and outside measurements
On the vernier caliper and height gage, what part of an inch does each graduation on the vernier scale represent?
0.001 inch
What attachment is used with the height gage to measure heights of less than one inch from the bottom of the base?
Offset attachment.
What is the purpose of an acute angle attachment?
When used in conjunction with a vernier bevel protractor, it permits a longer line of contact on parts that have angles of less than 30
What happens to a dial indicator when it is in contact with a part or component that is struck with a hammer?
Tapping on the component has almost the same effect as tapping on the indicator itself, and can damage the indicator.
Why does a coaxial dial indicator provide a more accurate location than a standard dial indicator?
Because operating conditions are more closely replicated; with the machine spindle running, the influence of power transmission, lubricant flow, and torque are integrated into the indicator reading.
What type of blade should you use to cut through a 1-inch brass rod with a hacksaw?
All-hard
When starting a cut on a piece of stock, what can you do to prevent the hacksaw blade from sliding
File a notch on the work before you start sawing.
What are some hints that will help speed up sawing operations?
Apply a little oil to the blade to reduce binding, clamp thin stock between two pieces of wood to prevent chatter, and keep the work tight in the vise to prevent it from slipping.
Besides length, what is the main difference between an 8-inch single-cut bastard file and a 10- inch single-cut bastard file?
A 10-inch single-cut bastard file is coarser because the distance between the teeth increases as the length of the file increases.
What is pinning?
The lodging of metal particles in the file teeth.
What types of cuts are provided by a flat file?
Double-cut on both sides and single-cut on both edges; additionally, they are available in bastard, second- cut, and smooth-cut types.
Which type of file has one “safe” edge? Describe the file’s use.
The pillar file; used for filing keyways and slots.
When would you use a helical fluted reamer?
When you want to make an interrupted cut
What is the purpose of the bore and taper on a solid-blade expansion reamer?
To permit expansion on the reamer end when you turn the adjustment screw
Which reamer has a taper of 1/4 inch per foot?
Taper pin reamer.
When is a line reamer used?
When two or more holes are to be reamed in line with each other
How do you prepare a hole for broaching?
The hole should permit the broach pilot to enter freely, but not let it fall freely past the first cutting tooth. The area around the hole should be perpendicular to the workpiece surface on the entry and exit sides.
What type of pressure is applied when you are using a broach?
Slow and even.
After you’ve finished broaching the hole, what do you do?
Push the broach all the way through the hole, and catch it as it exits the hole.
How do the three common types of hand taps differ?
(1) A starting or taper tap has eight to 10 of its beginning teeth tapered.
(2) A plug tap has three to five of the beginning teeth tapered.
(3) A bottoming tap has only one to two of its beginning teeth tapered.
Would you drill a 1/2-inch-diameter hole before you use a 1/2-inch 13 tap? Explain.
No. If you drilled a 1⁄2-inch hole for a 1/2 – 13 tap, the hole and the tap would have the same major diameter
Why do you occasionally turn the tap backwards as you are tapping?
To break the chips and help clear them from the teeth.
Before you try to back a broken tap out of a hole, what do you do?
Use a scribe to pick the metal chips out of the hole and out of the tap flutes.
If you’re trying to remove a broken tap that’s protruding out of the parent part, what can you do to help seat the vise grips easier?
Take a handheld grinder and grind flats on the tap
Which tap removal method would you use as a last resort?
Using a punch and hammer to break up the tap
What features permit a die to produce rough and finish cuts?
The die has a groove cut completely through one side and a setscrew to allow for a small amount of expansion and contraction of the die.
What is the difference between the starting side and trailing side of a die?
The starting side of a die has approximately three threads tapered; the trailing side has approximately one thread tapered
How can you cut threads to a shoulder while using a die?
Flip the die over in the diestock and cut the last two or three threads with the trailing side of the die.
What is the Pythagorean Theorem?
The square of the length of the hypotenuse of a right triangle equals the sum of the square of the other two sides; for example: c2 = a2 + b2.
What is the sum of all angles in any triangle?
180°.
What constitute complementary angles of a right triangle?
If both acute angles equal each other.
Which side of a right triangle is always the longest?
The hypotenuse.
What are bolts used with? What are they used for?
They are used with nuts and threaded holes. They are used to fasten parts together
What are set screws used for?
Used to fasten parts, such as pulleys, gears, etc., to shafts.
What consideration must you give penetrating fluid before you use it?
Keep it from soaking electrical wiring;
What are four bolt and stud removal methods that don’t take a lot of time and require only common hand tools?
A scribe, a punch, a file and wrench, and self-locking pliers.
When might you try using a file and a wrench to remove a broken bolt or stud?
When it is broken off above the parent metal.
When drilling out a broken bolt, what is the most accurate method?
A drill jig.
When drilling to get the hole in the center, what should you do?
Always try to center punch the end of the broken bolt and use a pilot drill first instead of going directly to the tap drill size.
What can you use to make your own extractor in place of an Easy-Out?
grinding a high-speed lathe tool bit with a square tapered end.
What should you do first when you try to remove a stuck screw?
Remove dirt or paint from the screw slot
What item can you add to a standard speed handle to improve its performance?
A pressure pad.
What are the steps to remove screws with a screw removal tool?
Position the foot under the head of an adjacent screw. Adjust the sliding driver until the apex holder is directly over the screw you want to remove. Turn the T handle while maintaining pressure on the removal tool.
Where is a good place to use a pneumatic hammer to remove screws?
Floor panels on cargo aircraft, or other very solidly supported surfaces.
What important area must you inspect before you use a pneumatic hammer?
Check the amount and type of backing for the surface.
How far should you rotate a stuck screw with a pneumatic hammer?
No more than one quarter turn.
What’s the most common screw removal tool?
The screw punch.
When you use a screw punch to remove a stuck screw, should you use heavy blows or light taps?
Use light taps, since heavy blows can cause you to skip off the screw head and damage the parent part.
What are the tools you need when you remove screws with a hand impact tool?
Hammer, speed handle, correctly sized apex for the screw, and correctly sized apex holder for the apex.
What screw removal method is especially useful when you have a large number of badly damaged screws?
Drilling the screws.
What tool do you use first when you drill off a screw head or when you drill for an Easy-Out?
A rotary file
What tool should you try first when attempting to remove a plug?
an extractor
How can you prevent drill shavings and pieces of the plug from falling into the cavity or
cylinder?
Pack grease in the center of the plug.
How many times can cotter pins be reused?
Once
What’s the biggest disadvantage of using solid inserts?
They take up a large amount of space in the parent metal
When you seat an insert with a locking ring, how far below the parent material should you seat
the insert? How far below the parent metal surface should you seat the locking ring?
The insert should be 0.010” to 0.020” below the surface, and the lockring should be 0.005” to .0010” below the surface.
What type of insert gives the highest bolt pull out resistance with the least weight and space penalty of any thin walled inserts?
Rosan slimserts.
From what material are Rosan slimserts made?
17–4 PH stainless steel.
What’s the difference between SR slimserts and SRW slimserts?
The SR series inserts are designed to repair holes originally designed for SR. SRW series (also known as “oversize” series) slimserts are designed to replace holes originally fitted with Heli-Coil inserts
What feature on a slimsert keeps it from rotating in the parent material?
The top external threads are serrated and are swaged into the bolt
What material is used in the manufacturing of a Heli-Coil insert, and what is its tensile strength?
It is made of 18–8 PH stainless steel, with a tensile strength of 200,000 psi.
What is the main disadvantage of using a Heli-Coil?
They cannot be installed where a seal is needed for air or liquid pressure
What item can you install in a hole if a standard size insert is too small?
A twinsert
Should you remove a Heli-Coil by pulling it straight out with a pair of pliers? Why?
No. It can damage the parent threads to where they cannot be used again
When you remove a pin insert, what is your first task?
Remove the pins before you back the insert out of the hole.
What are two other names for a bushing?
A bush, and an independent plain bearing.
What are the most common designs of bushings?
Solid (sleeve and flanged), split, and clenched bushings.
What features on both the parent material and the bearing keep the bearing aligned and keep it from binding when you install it?
A chamfer.
What’s the fit when you install a plain bearing?
An interference fit.
What bearing has a longer service life, a plain bearing or an anti-friction bearing?
Anti-friction bearings.
If you’re going to remove a bearing and reuse it, what precaution must you take?
Don’t put pressure on the inner race when you press it out.
what are the 3 methods of roller skating?
The three methods include roller staking, double anvil swaging, and roller swaging
What’s the limitation to roller staking bearings in aluminum housings?
Once they are staked, they cannot be restaked without shearing off the housing material.
What are the two methods of swaging bearings?
Double anvil and roller swaging.
Who is responsible for providing all AF personnel with a safe and healthy work environment?
Commanders
How are unsafe and unhealthy working conditions eliminated or controlled?
Through engineering changes, administrative controls, revised procedures
Who is responsible for good housekeeping in the shop?
All personnel in the shop/work center
When is the best time to clean up a spilled substance?
Immediately
What is the flash point of a flammable liquid?
Less than 100°F.
How might a cleaning solvent that is normally safe produce flammable vapors?
By being heated above its flash point
What measures should you take to prevent a fire from agitated combustible solvents?
Remove all sources of ignition and provide adequate ventilation
What official may authorize you to store flammable or combustible liquids inside the shop?
The base fire marshal.
Name five ignition sources that could cause accidental fires and explosions.
Smoking materials, space heaters, electrical equipment not rated as explosion-proof, improperly fused electrical equipment and tools that produce sparks, and static electricity.
Describe the specifications for an oily rag container
Self-closing metal container clearly marked OILY WASTE ONLY.
Who conducts safety inspections in the metals technology shop?
Safety inspections are conducted at the wing or group safety office level; spot inspections are conducted at the squadron, flight, and element leve
Why do we conduct safety inspections?
To catch and eliminate unsafe actions or conditions before someone gets hurt.
What PPE item is required for all maintenance personnel?
Steel toe boots.
Before you begin any work, what should be your first action?
Remove all watches, rings, bracelets, necklaces, or other jewelry that could be a safety hazard.
Would you use your hands to remove chips from machinery? Why?
No. Use a brush, or other approved device, to prevent cuts.
What items do you look for during an inspection prior to operating a machine?
Check the machine forms and the machine guards; look for the safety shut-off switches, and for any other items or obstructions that could prevent you from operating the machine.
Before you begin a welding operation, what should you look for?
Check the machine forms, check to be sure the machine ground is grounded.
If you’re welding in a confined space, what is an important safety action to take?
Make sure the area is vented properly.
What is the minimum amount of protective equipment you should use while grinding hazardous materials?
Safety glasses, a face shield, and a particle mask or filter mask.
If you need information about a particular material in the shop, where would you look?
The safety data sheet.
List some common hazardous materials you’ll use in the shop.
Welding rods, chemicals, coolants, metals, and solvents
Who is responsible for keeping SDSs current and for updating the SDS list in the hazardous materials pharmacy?
The shop SDS monitor.
What dangers do aircraft engines pose?
Intake and thrust, whether from jet or propeller aircraft, can turn objects into missiles and can severely injure personnel and damage equipment.
Describe the minimum safety zones for aircraft engines.
safe operating distances are 25 feet from the front of the intake, 5 feet from either side of the intake, and 200 feet from the exhaust of any aircraft with running engines.
Where is the noise safety zone for aircraft engines located?
Approximately 300 to 400 feet at the rear of the aircraft
What invisible hazard is produced by aircraft and can damage body tissue, particularly the eyes?
Aircraft radar.
If you are required to work in an aircraft cockpit, what special precautions should you take?
Make sure all safety pins are flagged and installed
What do you do first before you begin any maintenance on a weapon system?
Check the forms.
Who is authorized to upgrade an aircraft write-up? When or why?
A person of higher authority within the maintenance activity.
Who is the approving authority to downgrade a RED X?
The maintenance group commander
On what occasion is it acceptable to erase a RED symbol entered in the aircraft forms?
Never.
What is placed over the RED X when signing it off?
The first initial of your last name.
What is the purpose of the telescoping gage?
To measure slots or holes, where a micrometer or a vernier caliper would be awkward to handle.
Why is it necessary to ensure a small-hole gage is properly aligned while checking it with a micrometer?
To prevent erroneous readings
Which gage would you use for setting thread cutting tools or checking the angle of a lathe center?
Center gage.
What gage do you use to determine if a bolt has the correct thread pitch?
Screw pitch gage.
Which type of gage is very helpful for checking the accuracy of small bends and rounded edges in formed metal?
Radius gage
What gage do you select if you are trying to measure the gap between a bearing and its housing?
Feeler gage.( feeler gage)
