Ground Icing Procedures require advancing engines to greater than what N1 percentage every 5 minutes?

Ground Icing Procedures require advancing engines to greater than what N1 percentage every 5 minutes?

• A. 60%
• B. 70%
• C. 75%
• D. 65%

Answer: (B)

Ground icing procedures focus on keeping the engine spooled high enough to maintain safe airflow and heat to prevent ice buildup while the aircraft is exposed to icing on the ground. Advancing engines to greater than 70% N1 every five minutes ensures sufficient compressor stability, provides adequate bleed air for anti-ice systems, and keeps the engine components heated enough to prevent ice from forming or accumulating in the inlet and compressor. Lower power levels would not guarantee this protection, while 70% is the specified threshold the procedure requires to meet the safety intent.

Ground icing procedures focus on keeping the engine spooled high enough to maintain safe airflow and heat to prevent ice buildup while the aircraft is exposed to icing on the ground. Advancing engines to greater than 70% N1 every five minutes ensures sufficient compressor stability, provides adequate bleed air for anti-ice systems, and keeps the engine components heated enough to prevent ice from forming or accumulating in the inlet and compressor. Lower power levels would not guarantee this protection, while 70% is the specified threshold the procedure requires to meet the safety intent.