Answer :
Final answer:
It is not permissible to over-tighten castellated nuts on drilled bolts, bolt grip lengths should match or exceed material thickness, alloy steel bolts smaller than 1/4 inch diameter may have specific requirements in primary structures. for hence, option (3) is the correct answer.
Explanation:
When tightening castellated nuts on drilled bolts, it is NOT permissible to over-tighten the nut to permit alignment of the next slot with the cotter pin hole. Over-tightening can lead to damage and compromise the integrity of the bolted joint. It is important to follow the manufacturer's specifications and guidelines for proper torque values and installation procedures.
Bolt grip lengths should generally be equal to or greater than the material thickness. This ensures that the bolt has enough engagement with the materials being fastened, providing sufficient clamping force and structural integrity.
Alloy steel bolts smaller than 1/4 inch diameter can be used in primary structures, but their use may be subject to specific requirements and regulations. It is important to consult the appropriate standards and guidelines, such as those provided by aviation authorities or engineering design codes, to determine the suitability of different bolt materials and sizes for specific applications.
The correct statement regarding aircraft bolts is that the bolt grip lengths should generally equal the material thickness. Over-tightening nuts to align cotter pin holes is not permissible, and the use of alloy steel bolts smaller than 1/4 inch in diameter in primary structures depends on design requirements.
The statement that is correct regarding aircraft bolts is In general bolt grip lengths should equal the material thickness. Over-tightening castellated nuts to align cotter pin holes with the next slot is not recommended as it can lead to overstressing the bolt and potential failure. Furthermore, regulations and aircraft maintenance guidelines typically have specific torque values and procedures that must be followed for safety. As for the use of alloy steel bolts smaller than 1/4 inch in diameter, while they may be used in secondary structures, their use in primary structures is subject to design requirements and the engineer's discretion based on strength and safety considerations.
When a mechanic puts a length of pipe over the handle of a wrench, it effectively creates a longer lever arm, allowing the mechanic to apply a greater torque with the same force. This concept follows the principle of levers and torque calculations similar to the example questions where torque is the product of the force applied and the distance from the pivot point (wrench in these cases).
