What is the purpose of interpreting fault codes after reading them?

• A. To calibrate airspeed indicators
• B. To isolate faults and plan repairs
• C. To schedule passenger services
• D. To improve fuel efficiency

Answer: (B)

Interpreting fault codes after reading them is about pinpointing what went wrong and deciding what to do next. Those codes point to a specific system, sensor, or circuit and often include information about the failure mode or severity. With that information, technicians can quickly narrow the fault to a likely area, determine the necessary parts and tools, and plan the repair steps and downtime efficiently. This focused approach helps ensure the aircraft is fixed correctly and safely, rather than wasting time chasing unrelated issues. It’s not about calibrating airspeed indicators, scheduling passenger services, or directly boosting fuel efficiency—the codes themselves are a troubleshooting tool to guide maintenance actions.