What type of document identifies the calibration intervals of permanently installed shipboard instruments?

• A. CRL Document
• B. JFMM
• C. FCA Instructions
• D. Calibration Procedures Manual

Answer: (A)

The CRL Document, or Calibration Reference List, is specifically designed to identify the calibration intervals of permanently installed shipboard instruments. This document plays a crucial role in ensuring that all instruments are calibrated at appropriate intervals to maintain accuracy and reliability. By outlining the required calibration frequency, the CRL helps technicians adhere to regulatory standards and operational requirements, ultimately ensuring the safety and functionality of the ship's systems.

While other documents like the JFMM (Joint Fleet Maintenance Manual) provide broader maintenance guidelines, and the FCA (Functional Check-Acceptance) Instructions deal with testing and acceptance of equipment, they do not specifically focus on calibration intervals. The Calibration Procedures Manual provides detailed procedures for performing the calibration but does not typically include the intervals at which calibrations should be performed. Thus, when looking for a document that explicitly addresses calibration intervals, the CRL Document is the most appropriate choice.