How often should equipment be sent to PMEL for calibration?

Equipment should be sent to the Precision Measurement Equipment Laboratory (PMEL) for calibration according to established inspection schedules. This approach ensures that the equipment is always functioning accurately and meets operational standards, which is critical in aircrew flight equipment. Calibrating equipment before its due date helps prevent potential failures during missions, thereby maintaining safety and reliability. Regularly scheduled calibrations minimize the risk of equipment malfunction and help to maintain compliance with regulatory standards and operational requirements.

While equipment may be sent for calibration when malfunctioning or upon request, relying solely on these circumstances can lead to situations where equipment may not be functioning properly when needed. Annual calibration is insufficient given the variability in equipment usage and environmental conditions that can affect performance. Hence, adhering to a proactive calibration schedule is essential for effective aircrew operations.