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Pulling the handle mechanically releases the nose gear forward door uplock and the three landing gear uplocks. In addition, the handle operates dump valves that remove hydraulic pressure, allowing the gear to free-fall.
The nose doors open as the landing gear free-falls under its own weight. The nose gear extends rearward, and is assisted to the down-and-locked position by two downlock-assist springs (which lock the drag brace), and by the airflow pushing against the gear. The nose doors will remain open.
The MLG free-fall to the extended position. The main landing gear are assisted to the down-and-locked position by the MLG downlock-assist actuators, which are powered by hydraulic system 2. The MLG downlock-assist actuators force the MLG actuators to full extension, which engages the internal downlock mechanisms.
A ball-detent retains the LANDING GEAR MANUAL RELEASE handle in the extended position. To reset the handle, the button in the center of the handle must be depressed, and the handle lowered to the stowed position.
NOTE
To ensure priority to the primary flight controls, a spring-loaded-closed priority valve cuts off hydraulic system 3 pressure to the landing gear selector valves if system 3 pressure drops below 2,100 psi. Alternate landing gear extension will be required in this case.
NOTE
When normal hydraulic system 3 pressure is available, stowing the LANDING GEAR MANUAL RELEASE handle returns the landing gear selector valves to normal operation.
LANDING GEAR/BRAKES Description Vol. 2 15.10.9
Oct 05/06
Alternate Gear Extension Figure 15.10.5
Landing Gear Horn
When the aircraft is weight-off-wheels for more than two minutes, with any gear not down and locked, the landing gear horn will sound according to the logic in the following tables:
LANDING GEAR/BRAKES Description Vol. 2 15.10.10
Oct 05/06
Gear Horn Logic with “Precision Plus”
PROXIMITY SENSING ELECTRONIC UNIT (PSEU)
Description
The proximity sensing electronic unit (PSEU) receives data from various proximity sensors, microswitches, and cockpit controls and switches. The PSEU processes this data to control the landing gear extension and retraction sequences, and to provide aircraft configuration information to various systems for flight and ground operations.
Operation
Proximity sensors measure the physical relationship between two aircraft components (sensor and target). If the components are close, the sensors or microswitches provide a “near” signal. If the components are separated, a “far” signal is generated. The PSEU processes this information to command landing gear and other aircraft systems’ operation.
In the case of the landing gear, the PSEU monitors the position of the landing gear, nose doors, uplocks, downlocks and weight-on-wheels (WOW). It also electrically controls the hydraulic selector valves during normal landing gear extension and retraction. After takeoff, the PSEU disables the anti-skid and nosewheel steering systems. At touchdown, it rearms the system for use during the landing roll and taxi.
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