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A
757
MAINTENANCE MANUAL
SEEA
DOWNLOCK ASSEMBLY
TRIGGER
SEE B SIDE STRUT
A MAIN AND NOSE LANDING GEAR DOWNLOCK REMOVAL/INSTALLATION TOOL
B
Main Landing Gear Downlock Installation Figure 201
DOWNLOCK
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757
MAINTENANCE MANUAL
Nose Landing Gear Downlock Installation
Figure 202
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757
MAINTENANCE MANUAL
(2)
Downlocks, MLG and NLG - B32001-4
B.
Access
(1)
Location Zones 211/212 Control Cabin 711 Nose Landing Gear (NLG) 713/714 NLG Doors Forward 715/716 NLG Doors Aft 731/741 Main Landing Gear (MLG) 732/742 MLG Body Doors 733/743 MLG Oleo Doors 311 Area Aft of the Pressure Bulkhead (Left) 757-300 312 Area Aft of the Pressure Bulkhead (Right) 757-300
C.
Install the Downlocks
S 842-006
(1)
Make sure the control lever for the landing gear is in DN.
S 092-007
(2)
Remove the downlocks from the downlock pins bag.
S 492-008
(3)
Use the downlock removal/installation tool (Detail B) to install the downlocks on the main landing gear (2 locations), (Detail A, Fig. 201).
S 492-009
(4)
Use the downlock removal/installation tool (Detail B) to install the downlock for the nose landing gear (Detail A, Fig. 202).
(5)
Make sure the red warning streamers can be seen from the ground.
S 842-010
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757 MAINTENANCE MANUAL
LANDING GEAR MULTIPLE USE SYSTEM/COMPONENTS - DESCRIPTION AND OPERATION
_______________________________________________________________________
1. General_______
A. The landing gear multiple use system consists of the following:
(1)
Air/ground relays (AMM 32-09-02/001)
(2)
Proximity switch system (AMM 32-09-03/001)
B.
The air/ground relays provide switching and control functions for various airplane systems.
C.
GUN 051; The air/ground relays are located in misc relay panels P33, P36 and P37.
D.
GUN 001-010;
GUN 101-999;
The relays are located in misc relay panels P36 and P37.
E.
The relays energize or de-energize to provide air or ground mode operating condition. They are either energized in air or on ground. Air/ground sensing is provided by inputs from the nose gear not compressed sensors, main gear truck tilt sensors and truck position actuator hydraulic inlet pressure switches in the proximity switch system.
F.
The proximity switch system provides position sensing for landing gear, doors and thrust reversers. The system consists a proximity switch electronics unit (PSEU) located on the E3-4 shelf in the main equipment center, and numerous proximity sensors on landing gear, doors and engines. The sensors senses the proximity of targets installed and provide position signals to the PSEU. The PSEU converts these inputs into output signals for operation of relays, lamps and other electronics.
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