Which defect category includes examples such as incorrect model number or type, High Explosive (HE) instead of High Explosive Anti-Tank (HEAT)?

• A. Critical
• B. Major
• C. Minor
• D. Pitting

Answer: (B)

Defect categories are about how seriously a defect affects safety, reliability, and mission capability. A major defect is serious enough to degrade performance or safety and to require corrective action before the item can be used, but it isn’t necessarily an immediate, catastrophic hazard on its own.

Here, an incorrect model number or type means the item may not fit, function, or integrate properly with the system. That misfit or misidentification can lead to incorrect operation, reduced reliability, or failure to perform when needed. Using the wrong explosive type—HE instead of HEAT—creates a fundamental mismatch in purpose and performance, which can lead to dangerous outcomes such as improper functioning or unintended hazards. Both of these defects compromise safety and readiness significantly, so they’re categorized as major.

Pitting, by contrast, is a surface condition that typically doesn’t affect function or safety in the short term and is usually treated as a minor defect if it doesn’t impair performance. Critical defects would involve an immediate, life-threatening hazard or total loss of mission capability, which these examples do not inherently imply in isolation.