Which special inspection provision must be included for single-engine aircraft under 14 CFR Part 135 for passenger-carrying IFR operations?

The provision for periodic airframe inspections is crucial for ensuring the ongoing airworthiness of single-engine aircraft used in passenger-carrying IFR operations under 14 CFR Part 135. This regulation mandates that operators conduct these inspections to maintain safety standards and compliance with federal aviation regulations.

Periodic airframe inspections are necessary to identify any potential issues that could affect the aircraft’s structural integrity and overall safety during operations. These inspections help ensure that the aircraft remains in good condition and can perform reliably over time, especially when transporting passengers under Instrument Flight Rules (IFR), where operational standards are heightened.

While routine maintenance checks, engine trend monitoring, and engine oil analysis are relevant to aircraft maintenance and can play roles in ensuring safety and performance, they do not specifically address the regulatory requirement for periodic airframe inspections as set forth in Part 135. Thus, incorporating periodic airframe inspections is critical for compliance and for the safety of flight operations in passenger-carrying scenarios.