Definition
A long, manually operated lever in the cockpit used to actuate aircraft systems mechanically, most commonly the landing gear or wing flaps in light aircraft. The pilot moves the lever through a wide arc to drive the system directly through linkages, without the assistance of hydraulics or electric motors.
Plain English
A big hand lever in the cockpit that the pilot pulls or pushes to physically raise or lower the gear or flaps using muscle power, not a motor.
Context Anchor
Seen in older aircraft, light training aircraft with manual flaps, and maintenance descriptions of cockpit control systems.
Derivation
Named after the long mechanical control levers used on early steam locomotives and farm machinery, where a strong hand lever provided direct mechanical advantage. The aviation use kept the same idea: one person, one lever, direct mechanical action.
Why Pilots Care
If you fly an aircraft equipped with a Johnson bar, you raise and lower the gear or flaps yourself by physical effort. Technique matters: it requires a firm, deliberate motion, and improper handling can cause the lever to snap back or fail to latch, leaving the gear unsecured.
Intuition Check
Do not assume a Johnson Bar is just any metal bar or a brand name. In aircraft use, it means a cockpit lever used by hand to operate a mechanical system.
Example Sentence 1
After takeoff in the Mooney, he pulled the Johnson bar up in one smooth motion to retract the gear.
Example Sentence 2
During the preflight, the instructor checked that the Johnson Bar moved freely through every flap detent.