What indicators accompany gearbox fail to shift?

What indicators accompany gearbox fail to shift?

• A. Master Caution and respective Gen light
• B. Warning horn only
• C. Hydraulic light
• D. No indicators

Answer: (A)

When a gearbox fails to shift, cockpit warnings typically show a Master Caution along with the generator (Gen) light for the affected system. The Master Caution is the broad alert that an abnormal condition exists and needs attention, while the Gen light points to an issue in the electrical drive system closely tied to the gearbox—often the accessory gearbox that powers the generator. Seeing both together tells the crew that the gearbox problem is not only a mechanical shift fault but also has implications for electrical power, guiding the pilot to follow the appropriate procedures and monitor power availability. A warning horn alone isn’t as informative in this scenario, and a hydraulic light would indicate a hydraulic fault rather than a gearbox shift issue. No indicators would be incorrect because some alert is expected when the gearbox can’t shift.

When a gearbox fails to shift, cockpit warnings typically show a Master Caution along with the generator (Gen) light for the affected system. The Master Caution is the broad alert that an abnormal condition exists and needs attention, while the Gen light points to an issue in the electrical drive system closely tied to the gearbox—often the accessory gearbox that powers the generator. Seeing both together tells the crew that the gearbox problem is not only a mechanical shift fault but also has implications for electrical power, guiding the pilot to follow the appropriate procedures and monitor power availability.

A warning horn alone isn’t as informative in this scenario, and a hydraulic light would indicate a hydraulic fault rather than a gearbox shift issue. No indicators would be incorrect because some alert is expected when the gearbox can’t shift.