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Radalt inop Any <163 kt Any Both idle On No
Radalt inop Any <163 kt >30 Any position On No
<1,000 ft VSI inop Any Any Any position On No
<1,000 ft >400 fpm Any Any Any position On No
<500 ft Any Any Any Both idle On No
<500 ft Any Any >30 Any position On No
Gear Horn Logic without “Precision Plus”
AIRSPEED FLAPS THROTTLES HORN
CAPABLE OF
MUTING
>185 kt 0 Both idle Off N/A
<185 kt 0 Both advanced Off N/A
<185 kt 0 One idle On Yes
<185 kt 0 Both idle On No
>163 kt >0 Both idle Off N/A
<163 kt <30 Both advanced Off N/A
<163 kt <30 One idle On Yes
<163 kt <30 Both idle On No
<163 kt >30 Any position On No
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.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PROXIMITY SENSING ELECTRONIC UNIT (PSEU) (CONT'D)
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.
There are two WOW proximity sensors installed on each landing gear assembly, for a total of six
WOW sensors. Various aircraft systems require “ground” or “air” mode information for operation.
The PSEU determines “ground” mode and “air” mode information for operation. The PSEU
determines “ground” mode and “air” mode as follows:
PSEU Mode Determination Table
PSEU MODE DETERMINATION REQUIRED CONDITIONS
Ground
– Any three of the four main gear proximity sensors indicate
weight-on-wheels
Air
– If “ground” mode conditions are not satisfied, the PSEU is
in “air” mode
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PROXIMITY SENSING ELECTRONIC UNIT (PSEU) (CONT'D)
PSEU Critical & Non-Critical Drivers
CRITICAL DRIVERS NON-CRITICAL DRIVERS
SUBSYSTEM SUBSYSTEM
ANTI-SKID INBOARD ADG LOGIC #1
STALL WARN SYS #1 HSTCU
WOW RLY #1 FSCU
CVR ATC #1
THRUST REV DPLY #1 NG WOW #1 (SBW)
CABIN PRESS CTL ADG LOGIC #2
ANTI-SKID OUTBOARD HSTCU #2
STALL WARN SYS #2 ATC #2
TCAS NG WOW #2 (SBW)
WOW RLY #2 GCU OVERVOLTAGE TEST
INTERCOM
THRUST REV DPLY #2
DC ESS TIE
SATCOM/WATER PURGE/AVIONICS MASTER
HYDRAULIC PUMP #1
THRUST REV WOW #1
HYDRAULIC PUMP #2
THRUST REV WOW #2
MAIN WHEEL BINS AND OVERHEAT DETECTION
Description
Each main gear assembly retracts inward into wheel bins that are recessed in the main landing
gear bay.
Components and Operation
Wheel Bins
The wheel bins isolate the wheels from the main landing gear bays, and prevent tire-thrown
debris from damaging the equipment located within the MLG bay. The bins can be removed to
allow maintenance personnel access to the MLG bay.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
MAIN WHEEL BINS AND OVERHEAT DETECTION (CONT'D)
Main Landing Gear Overheat Detection
An overheat detection unit and heat-sensing loop continuously monitor each wheel bin for
overheat conditions. If an overheat condition exists, the MLG BAY OVHT warning EICAS
message will be displayed, and the “GEAR BAY OVERHEAT” aural will sound.
If a failure is detected (shorted heat-sensing loop), the MLG BAY OVHT FAIL caution EICAS
message will be displayed. For additional information, see Chapter 9, Fire Protection.
　
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