During the Prop De-Ice operation, what does a lack of CAS message indicate?

• A. The Propeller De-Ice test is functioning properly
• B. The Propeller De-Ice test has failed
• C. The Propeller De-Ice is not installed
• D. The test will not run

Answer: (A)

During Prop De-Ice operation, the system uses cockpit alerting to flag faults. If something abnormal is detected, a CAS warning would appear. Therefore, a lack of any CAS message means no fault has been detected—the Prop De-Ice test is functioning properly and the system is operating in its normal, healthy state. If a fault were present or the test couldn’t run, you would expect some CAS indication to alert you.