Which of the following is NOT listed among the Four Must Fix Faults?

• A. Han or crash
• B. RS Isolate
• C. Map System Error
• D. Reorientation=no go

Answer: (D)

The idea being tested is which faults are considered immediate “must fix” problems that stop you in your tracks and require corrective action before you can continue. Hang or crash, RS isolate, and Map system error are all faults that directly cripple the system’s ability to operate safely or accurately, so they fall squarely into the must-fix category. A hang or crash freezes the system, an RS isolate indicates a fault that jeopardizes the radar or related subsystems, and a map system error undermines navigation or targeting data—each of these demands immediate attention and repair.

Reorientation=no go, on the other hand, isn’t categorized as one of those four must-fix faults. It’s a separate condition related to whether the system can reorient or proceed under a given scenario, and it doesn’t fit the same immediate fault-forcing criterion as the others. So it isn’t listed among the Four Must Fix Faults.