A primary reason why ordinary or otherwise nonapproved cleaning compounds should not be used when washing aircraft is because their use can result in: hydrogen embrittlement in metal structures hydrogen embrittlement in nonmetallic materials a general inability to remove compound residues.
How may magnesium engine parts be cleaned? soak in a 20 percent caustic soda solution spray with MEK (methyl ethyl ketone) wash with a commercial solvent, decarbonize, and scrape or grit blast.
Select the solvent recommended for wipe down of cleaned surfaces just before painting: aliphatic naphtha dry-cleaning solvent aromatic naphtha.
During starting of a turbine powerplant using a compressed air starter, a hung start occured. Select the proper procedure: shut the engine down re-engage the starter advance power level to increase RPM.
A hung start in a jet engine is often caused by: malfunctions in the ignition system the starter cutting off too soon an excessively rich fuel/air mixture.
Which statement(s) below reflect(s) the typical requirement(s) when towing some aircraft?
1. discharge all hydraulic pressure to prevent accidental operation of the nosewheel steering mechanism.
2. tailwheel aircraft should be towed backwards.
3. if the aircraft has a steerable nosewheel, the torque-link lock should be set to full swivel 1 and 2 2 3.
What FAA-approved document gives the leveling means to be used when weighing an aircraft? type certificate data sheet AC 43.13-1B manufacturer's maintenance manual.
What is the means by which the FAA notifies aircraft owners and other interested persons of unsafe conditions ans prescribes the condition under which the product may continue to be operated? airworthiness directives airworthiness alerts aviation safety data.
Which is in appliance major repair? overhaul of a hydraulic pressure pump repairs to a propeller governor or its control troubleshooting and repairing broken circuits in landing lights circuits .
A lead-acid battery with 12 cells connected in series (no-load voltage=2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery is this instance is: 0.52 ohms 2.52 ohms 5.0 ohms.
If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed? apply boric acid solution to the affected area followed by a water rinse rinse the affected area thoroughly with clean water apply sodium bicarbonate solution to the affected area followed by a water rinse.
Which statement regarding the hydrometer reading of a lead-acid storage battery electrolyte is true? the hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 deegres F a specific gravity correction should be subtracted from the hydrometer reading if the electrolyte temperature is above 20 deegres F the hydrometer reading will give a true indication of the capacity of the battery regardless of the electrolyte temperature.
The end of charge voltage of a 19 cell nickel cadmium battery, measured while still on charge, must be 1.2 to 1.3 volts per cell. must be 1.4 volts per cell. depends upon its temperature and the method used for charging.
What part of the Federal Aviation Regulations prescribes the requirements for issuing mechanic certificates and associated ratings and the general operating rules for the holders of these certificates and ratings? 14 CFR Part 43. 14 CFR Part 91. 14 CFR Part 65.
An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?
Resistance and capacitive reactance. Inductance and frequency. Resistance and voltage.
(1) In nondestructive testing, a discontinuity may be defined as an interruption in the normal physical structure or configuration of a part.(2) A discontinuity may or may not affect the usefulness of a part.Regarding the above statements,
only No. 1 is true. only No. 2 is true. both No. 1 and No. 2 are true.
An aircraft owner was provided a list of discrepancies on an aircraft that was not approved for return to service after an annual inspection. Which of the following statements is/are true concerning who may correct the discrepancies?1. Only a mechanic with an inspection authorization.2. An appropriately rated mechanic.3. Any certificated repair station.
2 & 3. 2 . 1.
Where are technical descriptions of certificated propellers found?
Applicable Airworthiness Directives. Aircraft Specifications. Propeller Type Certificate Data Sheets.
(Refer to Figure 39 .) Determine the minimum wire size of a single cable in a bundle carrying a continuous current of 20 amperes 10 feet from the bus to the equipment in a 28-volt system with an allowable 1-volt drop. No. 14. No. 16. No. 12.
In examining/inspecting and evaluating a welded joint, a mechanic should be familiar with:
likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition. the welding technique, filler material, and temperature range used. the parts, proportions, and formation of a weld.
A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required to dissipate?
Less than .035 watt. At least .70 milliwatt. At least 35 milliwatts.
Metal tubing fluid lines are sized by wall thickness and: outside diameter in 1/32 inch increments. outside diameter in 1/16 inch increments. inside diameter in 1/16 inch increments.
When reading a blueprint, a dimension is given as 4.387 inches +.005 -.002. Which statement is true?
The maximum acceptable size is 4.390 inches. The minimum acceptable size is 4.385 inches. The minimum acceptable size is 4.382 inches.
Typical application for zener diodes is as:
half-wave rectifiers. full-wave rectifiers. voltage regulators.
The result of 7 raised to the third power plus the square root of 39 is equal to:
.34924. 343.24. 349.24.
A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required to dissipate?
Less than .035 watt. At least .70 milliwatt. At least 35 milliwatts.
Find the square root of 3,722.1835.
61.0097. 61.00. 61.00971.
Maximum life for a certain part is 1100 hours. Recently, 15 of these parts were removed from different aircraft with an average life of 835.3 hours. What percent of the maximum part life has been achieved?
75.9 percent. 76.9 percent. 75.0 percent.
Which of the following can provide the empty weight of an aircraft if the aircraft's weight and balance records become lost, destroyed, or otherwise inaccurate? reweighing the aircraft the applicable aircraft specification or type certificate data sheet the applicable flight manual or pilot's operating handbook.
In the theory of weight and balance, what is the name of the distance from the fulcrum to an object? lever arm balance arm fulcrum arm.
(1) Private aircraft are required by regulations to be weighed periodically. (2) Private aircraft are required to be weighed after making any alteration.
Regarding the above statements, neither no.1 nor no.2 is true only no.1 is true only no.2 is true.
To obtain useful weight data for purposes of determining the CG, it is necessary that an aircraft be weighed: in a level flight attitude with all items of useful load installed with at least minimum fuel (1/12 gallon per METO horsepower) in the fuel tanks.
What type of measurement is used to designate arm in weight and balance computation? distance weight weight/distance.
Magnetic particle inspection is used primarily to detect: distortion deep subsurface flaws flaws on or near the surface.
Liquid penetrant inspection methods may be used on which of the following?
1. porous plastics
2. ferrous metals
3. nonferrous metals
4. smooth primer-sealed wood
5. nonporous plastics 2, 3, and 4 1, 2, and 3 2, 3, and 5.
What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects? residual inductance continuous.
What unit is used to express electrical power? volt watt ampere.
Which of these will cause the resistance of a conductor to decrease? decrease the length or the cross-sectional area decrease the length or increase the cross-sectional area increase the length or decrease the cross-sectional area.
Through which material will magnetic lines of force pass the most readily? copper iron aluminum.
The voltage drop in a conductor of known resistance is dependent on: the voltage of the circuit only the resistance of the conductor and does not change with a change in either voltage or amperage the amperage of the circuit.
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