What does a red CLU BIT failure indicator mean?

• A. CLU may not be able to launch missile
• B. If the missile won't fire, disconnect and reconnect CLU
• C. If the missile will still not fire then get a new round
• D. If the new round won't fire then the CLU is unserviceable

Answer: (A)

A red CLU BIT failure indicator means the Built-In Test detected a fault in the Command Launch Unit that could prevent a safe launch. Because BIT checks critical launch subsystems, a red signal indicates the system cannot be trusted to fire reliably until the fault is diagnosed and corrected. In other words, the CLU may not be able to launch the missile until the issue is resolved.

The other options imply specific reset or component replacement actions, or assume the fault lies with the round, which aren’t what the indicator itself denotes. The red flag is about launch readiness and the potential for non-launch, not a guaranteed fix-by-reseat or a guaranteed replacement.