BOMBARDIER BD-100-1A10, Operating Manual

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LANDING GEAR
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6
15-01-03
PROXIMITY SENSING SYSTEM (Cont)
LANDING GEAR POSITION AND WARNING SYSTEM (Cont)
The PSEU monitors all gear functions. Any deviation from the selected gear configuration or failure of the uplocks or
downlocks is annunciated on the EICAS in the form of visual and aural messages
LANDING GEAR
MAIN LANDING GEAR
DESCRIPTION
The Main Landing Gear (MLG) consists of two shock strut type, trailing link assemblies. The MLG retracts toward the
centerline of the fuselage. The MLG is hydraulically actuated by the left hydraulic system and electrically controlled by
the PSS.
The MLG are hydraulically retracted into the MLG bay, located in the wing underside, by a side brace actuator. This actu-
ator is a hydraulic piston-cylinder actuator with an internal segmented down locking mechanism. Each gear is held in the
up lock position with a MLG Uplock Assembly.
COMPONENTS AND OPERATION
Each main landing gear assembly consists of:
- Main Landing Door Mechanism
- Main Fitting
- Side Brace Actuator Assembly
- Nitrogen gas/oil filled Shock Strut
- Trailing Arm Assembly
- Axle with Carbon Brake Assemblies
- Dual Wheels
- Uplock Mechanism
- Extension and Retraction actuator
- Auxiliary Extend Assembly
- Electrical Harnesses and Hydraulic Dressings
MAIN GEAR DOOR
The main gear door is mechanically linked to the main landing gear assembly and moves with the gear during extension
and retraction. Each main gear door is attached to the wing structure with two hinges. The main door structure is made from
a clad-aluminum alloy sheet. A nylon door brush is installed on the bottom edge of the door to create a seal between the
tire and fuselage.
MAIN WHEEL BINS
Each main gear assembly retracts inward into wheel bins that are recessed into the main landing gear bay. The wheel bins
isolate the wheels from the main landing gear bays and prevent tire-thrown debris from damaging the equipment located
within the main landing gear bay. Each wheel bin contains a single loop overheat detection wire to provide a CAS warning
should a wheel overheat. The bins can be removed to allow maintenance personnel access to the main landing gear bay.
MAIN LANDING GEAR UPLOCKS AND DOWNLOCKS
The main landing gear is held in the up-and-locked position by mechanical uplocks. With the gear extended, locking mech-
anisms in the side-brace keeps lock the gear in the down position. On the ground, locking pins can be inserted into the side
strut actuator.