Which statement concerning the 100-hour inspection of an airplane equipped with a push pull tube type control system is true?

Question

BlackTom AI · Accepted Answer

Push-pull tube control systems use rod ends (heim joints) and threaded connections that must maintain a minimum thread engagement for strength and safety. Manufacturers provide inspection holes specifically to verify that the threaded rod ends have sufficient engagement during periodic inspections.

1) Relevant knowledge points and concepts
- Push-pull tube systems transmit control forces through solid rods and rod-ends; the integrity of threaded connections is critical.
- Inspection holes are provided so an inspector can confirm minimum thread engagement without disassembly.
- Turnbuckles and their safety holes are features of cable systems, not typically the same inspection method used on push-pull tube rod ends.
- Rod ends can be adjusted for rigging; they are not permanently fixed if designed to allow rigging adjustments.

2) Step-by-step reasoning
- The maintenance requirement at 100-hour inspections includes checking control linkages for security, wear, and proper rigging.
- For threaded rod ends, the inspector looks through the provided inspection hole to ensure enough threads remain engaged inside the fitting; this prevents overstress or failure.
- The statement that rod ends should not be adjusted is incorrect because many rod ends are intentionally adjustable for rigging; staking at manufacture does not universally apply.
- The statement about terminal end threads of turnbuckles being visible through the safety hole applies to cable/turnbuckle assemblies and not specifically to push-pull tube rod-end inspection.

3) Intermediate verification steps
- Locate the inspection hole provided on the fitting.
- Visually confirm the threaded rod end extends past the minimum engagement mark or reaches the indicated depth per the manufacturer.

4) Why the correct answer is correct
- The provided inspection hole exists precisely to allow confirmation of thread engagement in push-pull tube systems; checking that engagement is a standard 100-hour inspection item.

5) Why other options are incorrect
- First option: incorrect because rod ends may be adjusted for rigging; they are not universally fixed and staked so no adjustments are allowed.
- Third option: incorrect because visible turnbuckle terminal threads through a safety hole pertains to cable/turnbuckle systems, not the push-pull tube rod-end inspection described.

Conclusion: The correct statement is that the threaded rod ends should be checked for the amount of thread engagement by means of the inspection hole provided, matching the given answer.

Which statement concerning the 100-hour inspection of an airplane equipped with a push pull tube type control system is true?单项选择题

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