Figure 9-1. Electric Retraction System
unlocks the selector valve so that the gear handle can
be positioned to raise the gear
(2) Ground locks. Ground locks prevent
landing gear collapse when the aircraft is on the ground.
One common type is a pin installed In aligned holes
drilled in two or more units of the landing gear support
structure. Another type is a spring-loaded clip designed
to fit around and hold two or more units of the support
structure together. All types of ground locks usually
have red streamers permanently attached to them to
readily indicate whether or not they are installed.
Gear Position Indicators. To provide a visual
indication of landing gear position, indicators are
installed in the cockpit or flight compartment. Gear
warning devices are incorporated on all retractable gear
aircraft and usually consist of a horn or some other aural
device and a red warning light.
e. Nosewheel Centering. Aircraft are commonly
provided nosewheel steering capabilities through a
simple system of mechanical linkage hooked to the
rudder pedals. Most common applications utilize
pushpull rods to connect the pedals to horns located on
the pivotal portion of the nosewheel strut.
Inspect landing gear for
obvious damage, then accomplish retraction test,
inspecting for the following items.
Landing gear for proper retraction and
Switches, lights, and warning horn for proper
Landing gear doors for clearance and freedom
Landing gear linkage for proper operation,
adjustment, and general condition
Latches and locks for proper operation and
Alternate extension or retraction systems for
Any unusual sounds such as those caused by
rubbing, binding, chafing, or vibration.