At what altitude is the aircraft approved to transit through light rime ice?

• A. 3000 ft
• B. 4000 ft
• C. 5000 ft
• D. 6000 ft

Answer: (C)

The aircraft is approved to transit through light rime ice at an altitude of 5000 ft due to the specific operational limitations stated in the aircraft's performance manuals and operational guidelines. This altitude is significant because, above this range, the likelihood of encountering severe icing conditions is reduced due to the atmospheric temperature and moisture content characteristics. Light rime ice usually forms in moist conditions, and operating at this altitude allows the aircraft to stay within a safer zone where the risks associated with ice accumulation are mitigated, thus ensuring the safety and performance of the aircraft while operating in potentially challenging weather conditions.

The choice of 5000 ft reflects a balance between safety protocols and operational requirements, reinforcing the importance of understanding aircraft limitations and the environmental factors that contribute to icing.