How does altitude affect TH-73A performance?

• A. Increased altitude can enhance engine performance
• B. Increased altitude can decrease engine and rotor performance due to reduced air density
• C. Altitude has no significant effect on performance
• D. Lower altitudes improve maneuverability

Answer: (B)

The performance of the TH-73A, like most rotorcraft, is significantly influenced by altitude due to changes in air density. As altitude increases, air density decreases, which directly affects both engine and rotor performance. The engine relies on air for combustion; lower air density means less oxygen available for the engine to operate efficiently, often leading to a reduction in engine power output. Additionally, the rotor blades rely on air density to generate lift; reduced air density at higher altitudes results in diminished lift produced by the rotors.

This reduction in engine and rotor performance is particularly critical for various flight operations, including takeoff, climb, and hover, where sufficient power and lift are essential. Pilots need to adjust their operational expectations and flight techniques accordingly when flying at higher altitudes.

While increased altitude might allow for different strategic advantages, such as avoidance of obstacles or enhanced visibility, it does not enhance engine performance. Therefore, option B accurately reflects the negative impact of increased altitude on the aircraft's performance.