What references should be consulted to determine the proper range marking for aircraft instrument glass?

What references should be consulted to determine the proper range marking for aircraft instrument glass?

• A. The pilot's operating handbook
• B. The maintenance logbook
• C. The aeronautical chart legend
• D. The aircraft flight or maintenance manual or certificate data sheet

Answer: (D)

Range markings on instrument glass are defined by official aircraft documentation that specifies installed equipment and its limits. To determine the proper markings for a specific airplane, you consult the authoritative references that list those limits: the aircraft flight manual (or pilots operating handbook) for operating limitations and instrument indications, the maintenance manual for calibration and service details that can affect readings, and the certificate data sheet for the approved equipment and their tolerances. These sources are aircraft-specific and formally approved, so they provide the exact markings you should rely on. Other sources like a chart legend describe chart information, not instrument display ranges, and a maintenance logbook records history rather than the defined display limits.

Range markings on instrument glass are defined by official aircraft documentation that specifies installed equipment and its limits. To determine the proper markings for a specific airplane, you consult the authoritative references that list those limits: the aircraft flight manual (or pilots operating handbook) for operating limitations and instrument indications, the maintenance manual for calibration and service details that can affect readings, and the certificate data sheet for the approved equipment and their tolerances. These sources are aircraft-specific and formally approved, so they provide the exact markings you should rely on. Other sources like a chart legend describe chart information, not instrument display ranges, and a maintenance logbook records history rather than the defined display limits.