How should a suspected gear lever malfunction be tested safely?

• A. Perform full retraction attempts to verify function.
• B. Follow manufacturer procedures; perform tests on the ground with parking brake set; avoid full retraction attempts until function is verified; use test equipment as specified.
• C. Test only in flight to observe behavior.
• D. Replace the lever assembly without testing.

Answer: (B)

When a gear lever malfunction is suspected, the test approach must be safety-first and procedure-driven. The best course is to follow the manufacturer’s procedures and carry out ground tests with the aircraft secured, using the parking brake to prevent any movement. This setup keeps the airplane from moving if the lever actuates unexpectedly and reduces risk during inspection.

Do not attempt full gear retraction or deployment while the fault is only suspected. Full retraction attempts can trigger uncontrolled gear movement, potentially causing damage or an unsafe landing profile if the system responds unexpectedly. Instead, verify function step by step with controlled, incremental checks guided by the maintenance manual.

Use the test equipment and methods specified by the manufacturer. That typically includes electrical checks of the lever interlock and position sensors, hydraulic pressure checks, actuator position verification, and monitoring of appropriate indicators and warning or interlock circuits. These diagnostics help pinpoint whether the issue lies with the lever, its switches, wiring, the hydraulic actuators, or the gear indication system, without risking unintended gear movement.

In short, diagnose safely on the ground with the parking brake set, following the exact procedures and tools the manufacturer requires, and only proceed to more active tests or retraction attempts once the system function has been verified or a clear fault is identified.