LANDING GEAR -DOOR LOCKS -MAIN LANDING GEAR
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LANDING GEAR -DOWNLOCK PIN -NOSE LANDING GEAR
General
The nose landing gear downlock pin installs in the NLG lock link.
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LANDING GEAR -DOWNLOCK PIN -NOSE LANDING GEAR
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LANDING GEAR -DOOR LOCK -NOSE LANDING GEAR
General
The NLG door lock pin prevents the nose landing gear doors from being closed.
The pin goes in the NLG door release/safety valve module on the forward bulkhead of the NLG wheel well. When installed, the pin prevents the movement of the safety valve to the unsafe position.
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LANDING GEAR -DOOR LOCK -NOSE LANDING GEAR
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
PROXIMITY SENSOR SYSTEM -INTRODUCTION
Purpose
The proximity sensor system (PSS) is primarily used to monitor the position of mechanical components. The PSS also provides position indication and control for some critical systems. PSS uses two proximity sensor electronics units (PSEUs) to provide position data for these systems:
*
Landing gear
*
Passenger entry doors
*
Cargo doors and access doors
*
Equipment center access doors
*
Thrust reversers
*
Tail strike system.
Abbreviations and Acronyms
*
AFDC -autopilot flight director computer
*
AIMS -airplane information management system
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altn -alternate
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AMU -audio management unit
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ARINC -Aeronautical Radio, Inc.
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bat -battery
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BITE -built-in test equipment
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BSCU -brake system control unit
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CSDS -cargo smoke detection system
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CSMU -cabin system management unit
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dn -down
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ECC -equipment cooling controller
*
EEC -electronic engine control
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ELMS -electrical load management system
*
EICAS -engine indication and crew alerting system
*
fwd -forward
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gnd -ground
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hdlg -handling
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lvr -lever
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HYDIM -hydraulic interface module
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MLG -main landing gear
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NLG -nose landing gear
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pri -primary
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PSEU -proximity sensor electronic unit
*
PSS -proximity sensor system
*
ref -reference
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SLG -Semi-levered gear
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TCAS -traffic alert and collision avoidance system
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TSA -tail strike assembly
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WEU -warning electronic unit
*
WOW -weight-on-wheels
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777 AIRCRAFT MAINTENANCE MANUAL
PROXIMITY SENSOR SYSTEM -INTRODUCTION
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PROXIMITY SENSOR SYSTEM -GENERAL DESCRIPTION
General
The PSS gets position data for some airplane components and supplies this data to other airplane systems for indication and control functions.
The proximity sensor system components include:
*
Two proximity sensor electronics units (PSEUs)
*
Proximity sensors.
Inputs
The PSEUS get position data from proximity sensors on these systems/components:
*
Landing gear
*
Passenger entry doors
*
Cargo doors and access doors
*
Thrust reversers
The PSS also gets some discrete hardwire inputs from the tail strike system and other airplane components.
Outputs
The PSEUs supply position data through the systems ARINC 629 buses to these airplane systems:
*
Airplane information management system (AIMS)
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