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Normal Gear Extension.....................................................................................................15-4
Alternate Gear Extension..................................................................................................15-5
MLG BAY OVHT TEST Switches .....................................................................................15-6
Steering Tiller....................................................................................................................15-7
Brakes and Lower Main Gear Structure............................................................................15-8
Hydraulic Synoptic Page (Inboard and Outboard Brake Pressure) ..................................15-9
Parking Brake Handle ..................................................................................................... 15-10
Landing Gear Panel ........................................................................................................ 15-11
Landing Gear Manual Release ....................................................................................... 15-12
Landing Gear EICAS Displays........................................................................................ 15-13
15-iv For Training Purposes Only
May 03
LANDING GEAR / BRAKES P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
LANDING GEAR / BRAKES
For Training Purposes Only
May 03
15-1
P I LOT T R A I N I N G GU I D E
CHAPTER 15: LANDING GEAR/BRAKES Introduction
The landing gear for the Challenger 604 is arranged in a standard retractable tricycle
configuration. Associated subsystems include:
• proximity sensing system
• nose gear doors
• nosewheel steering
• wheel brakes with anti-skid
• main landing gear overheat detection
Hydraulic system 3 powers landing gear extension and retraction, nosewheel steering,
and brakes.
Landing Gear
Figure 15-1
Main Gear
Door
Right Main
Landing Gear
Main Wheel
Bins
Nose
Landing
Gear
Nose
Gear
Doors
Left Main
Landing Gear
Main Gear
Door
P604_15_024
LANDING GEAR / BRAKES
15-2 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Landing Gear
Description
The main landing gear consists of two trailing link-type assemblies. The main landing
gear retracts inward toward the centerline of the fuselage. The main landing gear is
hydraulically actuated by hydraulic system 3 and electrically controlled by the
proximity sensing electronic unit (PSEU).
The nose gear is a forward retracting assembly. The nose gear and forward nose gear
doors are hydraulically actuated by hydraulic system 3 and electrically controlled by
the PSEU.
A manual landing gear extension feature is provided.
Components
Main Landing Gear (MLG)
Each main gear assembly consists of:
• Main beam
• Nitrogen-charged/oil-filled shock strut
• Trailing link
• MLG actuator
• Internal downlock mechanism
• Axle, brake, and wheel assemblies
• Uplock pins
• MLG doors
• Weight-On-Wheels proximity sensors
Main Wheel Bins
Each main gear assembly retracts inward into wheel bins recessed in the main landing
gear bay. Each wheel bin contains a single-loop overheat detection wire to provide an
EICAS warning should a wheel overheat occur.
MLG Uplocks and Downlocks
The MLG is held in the up-and-locked position by mechanical uplocks. With the gear
extended, internal locking mechanisms within the MLG actuators lock the gear in the
down position. On the ground, MLG ground locking pins can be inserted into the
MLG actuator.
LANDING GEAR / BRAKES
For Training Purposes Only
May 03
15-3
P I LOT T R A I N I N G GU I D E
MLG Doors
MLG doors mechanically attached to each of the MLG struts allow for partial
enclosure of the gear when retracted. In the retracted position, brush seals on the door
and wheel bins provide an aerodynamic seal between the tires and surrounding aircraft
structures.
MLG Weight-On-Wheels (WOW) Sensors
Two WOW proximity sensors are incorporated in each main gear assembly. They are
used to prevent landing gear retraction on the ground and they provide “ground” or
“air” status for other aircraft systems via the PSEU.
Main Landing Gear
Figure 15-2
Main Landing
Gear Actuator
Ground
Locking Pin
Main Landing
Gear Door
Uplock Pin
WOW Proximity
Sensors
Main Beam
P604_15_025
Main Oleo
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