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Airframe A&P
| Question | Answer |
|---|---|
| What are the three forms of wood commonly used in aircraft construction? | Solid, laminated, and plywood. |
| What type of wood should be used when splicing or reinforcing plywood webs? | The same type as originally used. |
| Name at lest four different types of defects found in wood. | Knocks, splits, pitch pockets, cross grain, curly grain, decay, dry rot, etc |
| Can a section of wood containing a hard knot be used? | Yes, with specified limits. |
| What type of glue may be used in order wood aircraft construction that requires careful inspection to detect deterioration? | Casein glue. |
| What are the three types of glue used in modern aircraft construction and repair? | Resorcinal glue, Phenol- formaldehyde glue, and epoxy resin glue. |
| Is compression wood acceptable for structural repairs? | No. |
| Why should the various pieces of wood being joined be kept in the same room for at least 24 hours prior to joining? | To allow the moisture content to equalize. |
| Why is it important to apply the proper clamping pressure to a glue joint? | Clamping forces air out of the joint, bring the wood surfaces together evenly and is, in part, responsible for the strength of the glue line. |
| Describe some of the methods used to apply pressure to glue joints. | Clamps, nailing strips, power presses, brands, nails, and small screws. |
| What minimum curing temperature should be observed when joining wood with various adhesives? | 70 degrees Fahrenheit or as specified by the glue manufacturer. |
| Describe the acceptable methods used to repair elongated bolt holes found in a wood wing spar. | Remove the section with the elongated bolt holes and splice in a new section or replace entire spar. |
| What type of joint is used to splice a solid or rectangular wood spar? | A scarf joints. |
| In what areas are splices to a wood spar prohibited? | Under an attachment fitting for the wing root, landing gear, engine-mount, life, or inter-plane strut. |
| What is the maximum number of splices allowed for any single spar? | Two. |
| Describe the characteristics of a scarf joint. | The pieces that are joined are to be tapered or beveled on a slope of 1 to 10 or 1 to 12. |
| Why must the beveled cut be accurate on both pieces of wood being repaired with a scarfed joint? | The two peaces must match exactly to ensure a tight glue joint. |
| What are the two primary uses for plywood in aircraft construction? | Reinforcing plates and aircraft skin. |
| Provide examples of at least three types of plywood skin repair. | Splayed patches,surface patches, plug patches, and scarfed patches. |
| What type of patches should be used to repair small holes in thin plywood skin if the skin is less than 1/10th inch thick? | A splayed patch. |
| What should be done to prevent a plywood patch and the pressure plate from sticking together if glue is extruded from the joint? | A piece of waxed paper or plastic should be placed between the patch and the pressure plate. |
| Why are lightweight steel bushings sometimes used in wood structures? | To prevent wood from being crushed when bolts are tightened. |
| What is the purpose of large surface area washers when used on wooden structures? | To help prevent damage to wood when hardware is tightened. |
| Name several facings and core materials used in bonded honeycomb structures intended for special applications. | Stainless steel, titanium, magnesium, plywood, glass, nylon, and cotton cloth. |
| Describe the construction of a bonded honeycomb structure. | Its laminated structure that has a solid facing bonded to either side of a core consisting of open, six-sided cells. |
| What must be done with a damaged area in a bonded honeycomb structure prior to beginning repairs? | Inspect to determine damaged area before removing damage. |
| A drill bit used for drilling composites should operate at approximately what speed? | A air-driven tool that is able to reach up to 20,000 r.p.m. |
| What are the most common causes for delamination of a composite structure? | Sonic vibration, expansion of internal moisture, liquid leakage, and a manufacturing error. |
| What type of defect in, or damage to, a bounded honeycomb structure can be repaired using the potted repair method? | Filling a hole. |
| Name some of the factors that causes crazing in transparent plastic windows and windshields? | Exposure to ultraviolet light, stress, solvents, and improper handling. |
| How should a hole be drilled in Plexiglas to avoid damage to the hole when the drill breaks through to the underside? | Back up the plastic with a piece of wood and feed the drill slowly. |
| Briefly describe the components of a thermal switch fire detection system. | Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning. |
| Are thermal switches wired in series or in parallel with each other? | Parallel. |
| How are the detector units in a double-loop Fenwal system wired? | In parallel between two loops of wire. |
| In what way is a thermocouple fire warning system different from the thermal switch system. | Thermocouple are sensitive to rate of temperature change, thermal switch system respond to a set temperature. |
| Briefly describe the components of a Kidde continuous loop fire detection system. | KIdde system has inconel loop whose resistance changes with temperature. |
| Briefly describe the components and operation of a Lindberg fire detection system. | A stainless steel tube contain a inert gas and a material that absorbs some gas. when the tubes heats up, some of the gas is released, raising pressure, witch activate pressure switch. |
| Describe the process or mechanism by which a photoelectric smoke detector generates a warming of a possible fire. | Smoke particles refract light and triggering the alarm. |
| How can the operation of a photoelectric smoke detector be tested? | By actuating a test switch. |
| Name two types of smoke detection systems used in aircraft. | Photoelectric and ionization. |
| What are the usual locations where a carbon monoxide detector would be installed? | Cockpit or cabin |
| How does a carbon monoxide detector indicate the presence of this deadly gas? | The spot detector turns gray or black. |
| What are the possibles effects of a kinks and sharp bends in the sensing elements of a fire warning system? | False warnings caused by short circuits. |
| how is a freon container checked for proper pressure? | A chart used to determine maximum and minimum gauge pressure. |
| Name the two basic types of fire extinguishing systems. | Conventional and High-rate discharge system. |
| Name the extinguishing most commonly used by conventional fire extinguishing system. | Carbon dioxide (CO2) |
| Name the extinguishing agent most commonly used by high-rate discharge fire extinguishing system. | Halon (Freon) |
| How are freon bottles protected from excessively high temperatures and how can you tell that this has occurred? | Thermal fuse will release the agent if the bottle temperature exceeds a certain limit. This blows out a red indicator disk. |
| What condition is indicated if the yellow disk is missing in a fire extinguishing system? | Normal system discharge. |
| Describe the mechanism by which a freon bottle is discharged. | An electrical signal fires a squib. |
| How is the service life of a discharge cartridge calculated? | From the date stamped on the cartridge by the manufacturer. |
| Where do you find the regulation that specifies the operating conditions that make 100-hour inspection mandatory? | FAR Part 91 |
| A certificated airframe & powerplant mechanic may sign off and approve the return to service following what type of inspection? | A 100-hour inspection. |
| Under what conditions may a mechanic perform an annual inspection and return the aircraft to service? | The mechanic holding an IA |
| What is the time frame within which an annual inspection must be performed if such an inspection is required? | Within 12 calendar months. |
| Under what conditions may any checklist be used as a guide for a 100-hour inspection? | Meet minimum standards specified in FAR Part 43, Appendix D |
| May an aircraft that is overdue for an annual inspection be flown to a place where the inspection can be performed? | Yes, with a ferry permit. |
| In order for an individual person to conduct a 100-hour inspection and approve the return to service, that person must have what type of certificate? | Airframe & Powerplant license. |
| An aircraft is required by FAR 91.409 to have a 100-hour inspection. Is it legal to fly that airplane beyond the inspection requirement, and if so, for how long? | Yes, 10 hours. |
| An airplane is flown 4 hours over the 100-hour inspection limit to reach your maintenance facility.How do you account for those 4 hours? | Subtract those 4 hours from the next 100-hour. |
| What types of operations require that aircraft operating under Part 91 must undergo 100-hour inspection? | Airplanes for hire. |
| An aircraft under a progressive inspection program is operated for compensation or hire.Does it need a 100-hour inspection? | No, the Progressive covers the 100-hour |
| Who is authorized to supervise a progressive inspection? | A&P with a IA, certified repair station, or aircraft manufacturer. |
| With a progressive inspection program is discontinued, at what time is the next 100-hour inspection due? | 100 hours after last complete inspection of the progressive program. |
| An owner desires to use a progressive inspection program. To whom does the owner apply for authorization? | FAA office. |
| Ia an engine run-up required as part of a 100-hour inspection on a turbine-powered aircraft? | Yes. |
| Where would you locate the required items that must be recorded in the aircraft maintenance records following completion of a 100-hour inspection? | FAR Part 43. |
| 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. |
| Where would you look to find approved information for work on an aircraft electrical system? | Manufacturer's maintenance Manuel. |
| What are the limitations placed on mechanics with regard to propellers? | No major repairs or alterations. |
| After equipment is installed in accordance with a STC, who must approve the return to service? | An A&P with a IA |
| What is the major type of damage to aluminum structures that is caused by exposure to the weather? | Corrosion. |
| Name several methods for forming sheet metal. | Bending or folding, stretching, shrinking, bumping, and crimping. |
| What are the dimensions of a properly formed rivet head? | The head should be 1 1/2 times the shank diameter in width and 1/2 the shank. |
| Describe the markings found on the heads of A, B, D, AD and DD rivets. | A are plain, B have cross, S have raised dot, AD have dimples, And DD have double dash. |
| What happens to the stem of a self-plugging rivet when the rivet is installed? | The stem is pulled until it snaps off and the remaining part is trimmed flush with the head. |
| Name at least three types of self-plugging mechanical lock rivets. | CherryMAX, Cherry-LOCK, and OLYMPIC-LOK. |
| What is the difference between the tools required to pull a CherryLOCK rivet and a CherryMAX rivet? | CherryLOCK require a different tool for each different size and shape. CherryMAX can be set to any size. |
| Which of the five stresses is the most common cause of rivet failure? | Shear. |
| If a 2024 rivet must be replaced with a 2117 rivet, how do you determine the size to be used? | Use the next size larger assuming that the edge distance and spacing meets the min requirements. |
| Describe the process for determining the total length of a solid rivet for a particular installation. | Add the grip length plus 1 1/2 times the diameter. |
| What minimum edge distance and spacing should be used for a single row of protruding head rivets? | Not less than 2D from edge and 3D apart. |
| How can a mechanic determine whether the countersink for flush rivet should be dimpled or drilled? | By the thickness of the top sheet, thin sheets are dimpled while thick sheets may be countersunk. |
| What action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet metal? | Hot dimpling equipment, and preheating the metal. |
| What type of damage can occur when using a rivet set that does not properly fit the rivet? | Damage to the rivet or sheet metal. |
| Why is it important to use the proper size and weight bucking bar when performing sheet metal riveting? | A larger one may be to hard to control, and small may not properly shape the rivet. |
Created by:
Bryantgray87