Which braking action code corresponds to "Good" (≥0.40)?

The braking action code corresponding to "Good" (≥0.40) is indeed Code 5. In aviation, braking action codes are used to communicate the conditions impacting the effectiveness of aircraft braking systems during landing. The codes generally range from Code 1, meaning "poor," to Code 6, which indicates "excellent."

Code 5 specifically denotes that the runway conditions are good enough for normal braking, and pilots can expect a moderate performance from their braking systems. This is crucial for ensuring safe operations, especially in adverse weather conditions where it is essential for pilots to understand the runway's current braking capability.

Understanding these codes is vital for flight safety, as they help inform pilots' decisions during landing and taxiing phases. Thus, a Code 5 represents an adequate level of performance, indicating that the runway is safe for normal operations, which directly aligns with the definition of "Good."