PROFICIENCY & EFFICIENCY 80 PROFICIENCY 83 OWNERSHIP 88 MAINTENANCE 92 ADS-B 99 NEVER AGAIN In 1981, the U.S. Army Icing Flight Research Team modified a Boeing CH-47C Chinook to create artificial icing clouds for testing new aircraft designs. Exposed parts, such as pitch change links, are susceptible to icing. Ice can form on the leading edge of the rotor blades, even before the helicopter lifts off. As with airplanes, air inlets can gather ice quickly. PROFICIENCY | 80 | AOPA PILOT January 2019 B Y M A R K U S L AV E N S O N CHARLES FLOYD Helicopters and ice Avoidance, detection, and survival