Name three major aircraft systems areas investigators examine to assess potential mechanical factors.

• A. Cockpit layout; passenger seating; cabin temperature control.
• B. Fuel types; color of paint; landing gear color.
• C. Airframe structure; propulsion (engine/airframe integration); and avionics/electrical systems.
• D. Weather radar; SATCOM; emergency equipment.

Answer: (C)

The main idea is that mechanical factors in an aircraft mishap are most often revealed by looking at how the airframe holds up, how the propulsion system works with the airframe, and how the electrical and avionics systems support or control those mechanical components.

Airframe structure is examined for evidence of structural integrity problems such as fatigue cracks, corrosion, or failed fasteners that could compromise strength or stiffness and lead to abnormal loads or uncontrolled movement. Propulsion and airframe integration focus on engine performance and how the engine, its mounts, ducts, and related hardware interact with the airframe; issues like unexpected engine behavior, vibrations, or misalignment can create mechanical stresses or loss of thrust transmission. Avionics and electrical systems are scrutinized because power distribution, sensors, actuators, and control software govern mechanical systems and can fail or give erroneous signals, causing or masking mechanical problems in flight controls, actuators, or engine control.

Other options involve systems or details not directly tied to mechanical factors in the investigation, such as cockpit layout or cosmetic aspects, or systems like weather radar and SATCOM that, while important, do not address the core mechanical contributors as directly as the three areas above.