F16 ALT Gear Down Panel 3D model

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If deployment of the landing gear doe not work during a hydraulic failure, the gear can be deployed by means of an auxiliary system. The Alternate Gear Down Handle (ALT LG Handle) unlocks the landing gear, which locks due to its own weight. Pulling the ALT GEAR handle supplies pneumatic pressure to open all LG doors, extend the landing gear and shut off the LG selector hydraulic valve. The LG/hook emergency pneumatic bottle is also used to lower the hook and contains sufficient pneumatic pressure for one LG extension and to hold the hook down. The bottle cannot be recharged in flight.