Special Missions Aviation (SMA) Block 1 Practice Test

In aircrew prefixes, the symbol before a crew member’s designation shows their level of qualification and authority. The X prefix specifically marks a basic qualified crewmember—someone who has the essential qualification to fly as part of the crew but is not in an instructor or evaluator role. This distinguishes them from other prefixes that denote specialized responsibilities: a prefix for evaluators, one for aircrew instructors, and another for formal training instructors. Knowing the X prefix helps you read crew rosters and training records, understand who is cleared to operate on missions, and recognize who may be in a teaching or assessment position. When someone takes on a training or evaluation role, their prefix changes to reflect that new responsibility, while the X prefix remains the baseline status for standard flight operations.