Wood, Composite, Transparent Plastic Structures
What are the three forms of wood commonly used in aircraft construction?
(1)Solid
(2)Laminated
(3)Plywood
Aircraft covering fabrics are made of materials from two sources?
(1) organic materials
(2) synthetic materials
Name the three principles types of welding.
(1) Gas welding
(2) Electric arc welding
(3) Electric resistance welding
What could cause an AC electric motor to run too fast?
Excessive applied voltage or shorted field windings.
Where do you find the regulation that specifies the operating conditions that make 100-hour inspections mandatory?
FAR Part 91
What type of wood should be used when splicing or reinforcing Plywood webs?
The same type of plywood as originally used
what two types of organic fibers are used for covering aircraft?
cotton and linen
What is the purpose of shielding an arc weld with an inert gas?
The gas prevents atmospheric oxygen and/or nitrogen from contaminating the weld.
What tool is used to check a motor or generator armature for shorts and opens under load conditions?
A Growler.
A certificated Airframe & Powerplant mechanic may sign off and approve the return to service following what type of inspection?
A 100-hour inspection.
Name several facings and core materials used in bonded honeycomb structures intended for special applications
(1)stainless steel
(2)titanium
(3)magnesium
(4)plywood
(5)glass
(6)nylon
(7)cotton cloth
what is meant by warm, weft, and bias
(1) warp is the direction along the length of fabric (2) weft is the direction across the fabric at right angles to the warp (3) bias is a direction at a 45 degree angle to the warp and weft
What is a common method of controlling expansion when welding a joint?
Place tack welds along the length of the joint.
When using a Growler, what indication will occur when a short exists between an armature segment?
When a metal blade is held over the armature and a short exists in a segment, the blade will begin to vibrate and "chatter."
Under what conditions may any checklist be used as a guide for a 100-hour inspection?
The checklist must meet the minimum standards specified in FAR Part 43, Appendix D.
Describe the construction of a bonded honeycomb structure
it is a Laminated solid facing bonded to either side of a core consisting of open, six sided cells.
What is meant by warp, weft, and bias?
(1) Warp is the direction along the length of the fabric (2) Weft i the direction across the fabric at right angles to the warp
(3) Bias is a direction at a 45 degree angle to the warp and weft.
What type of flame is used when torch brazing or silver soldering?
A neutral flame.
How would you identify a specific wire in a wire bundle?
By the identification code marked on the wire.
May an aircraft that is overdue for an annual inspection be flown to a place where the inspection can be performed?
Yes, provided a ferry (special flight) permit is obtained.
a drill bit used for drilling composites should have an included angle of how many degrees?
135 degrees
What identification marking is found on the selvage edge, and in which direction is the warp applied?
The FAA-PMA (Part Manufacture Approval) stamp is found on the selvage edge and the warp is applied parallel to the line of flight
How can a soft flame be obtained without reducing the heat output of the torch?
Use a larger tip and adjust the gas pressure accordingly.
Name several types of electrical devices that would be considered intermittent loads on an electrical system.
(1) Landing gear,
(2) cowl and wing flap motors
(3) radio transmitters
An aircraft is required by FAR 91.409 to have a 100-hour inspection. It is legal to fly that airplane beyond the inspection requirement, and if so, for how long?
Yes, the aircraft my be operated for up to 10 hours, if required, to reach a place where the inspection can be accomplished.
what are the most common causes for delamination of a composite structure?
(1) sonic vibration
(2) expansion of internal moisture
(3) liquid leakage
(4) manufacturer error
Name three common types of machine-sewed seams.
(1) Plain overlap
(2) Folded-fell
(3) French-fell
When an oxyacetylene torch is extinguished, which valve is turned off first?
Turn off the acetylene gas valve first.
What factors should be considered when determining the wire size for a particular application?
(1) The system voltage,
(2) Permissible voltage drop
(3) Current to be carried
(4) Wire length
(5) Whether the load is continuous or intermittent
What types of operations require that aircraft operating under Part 91 must undergo 100-hour inspections?
Aircraft operated for compensation or hire, or used for flight instruction when provided by the flight instructor.
name some of the factors that cause crazing in transparent plastic windows and windshields?
(1) exposure to ultraviolet light
(2) stress
(3) solvents
(4) improper handling
How would you determine the correct spacing for rib stitching if the original spacing was unknown?
Consult the chart in AC 43. 13-1B.
Welding magnesium can create a serious safety hazard. What is the nature of this hazard?
Magnesium burns with a very hot flame that is very hard to extinguish.
What is the maximum number of terminal lugs that can be placed on a single terminal strip stud?
Four
Where might you locate a sample of the recommended statement for recording the approval for return to service of an aircraft following completion of an annual or 100-hour inspection?
FAR Part 43
provide examples of at least three types of plywood skin repairs
(1) splayed patch
(2) surface patch
(3) plug patch
(4) scarf patch
How are the fabric type and strength requirements determined for fabric-covered aircraft?
The original manufacturer determines the fabric type, and the strength requirements are a function of the never-exceed speed and wing loading.
What technique might be used to enable a tight-fitting inner sleeve to be inserted into a tubular repair?
The inner tube could be chilled with dry ice or in a freezer while the outer tube could be heated slightly with a torch.
What should be done when making bonding or grounding connections between dissimilar materials?
Use a suitable washer so that any corrosion will occur on the washer.
What are the limitations placed on mechanics with regard to propellers?
Mechanics may not perform major repairs to, or alterations of, propellers.