Air/Ground System
[FCOM]
In flight and ground operation of various airplane systems are controlled by the air/ground system.
The system receives air/ground logic signals from six sensors, two on each landing gear. These signals are used to configure the airplane systems to the appropriate air or ground status.
[AMM]
The air/ground system supplies air/ground discrete signals to many airplane systems.
(The air/ground system supplies air mode and ground mode signals to airplane systems.)
These are the air/ground system components:
• Nose landing gear compressed sensors
• Left main landing gear compressed sensors
• Right main landing gear compressed sensors
• Proximity switch electronics unit (PSEU)
• Air/ground relays
• PSEU fault light.
Two air/ground systems monitor the compression of the landing gear shock struts.
Two compressed sensors are on each landing gear. One sensor sends inputs to air/ground system 1 and the other sensor sends inputs to air/ground system 2. Sensor signals go to the PSEU. The two air/ground systems in the PSEU monitor signals from the sensors in their air/ground system. The PSEU then sends air/ground discrete signals and signals to operate air/ground relays. Airplane systems use the air/ground discrete signals and relays for airplane air/ground inputs. The amber PSEU light comes on when either air/ground system is in override mode. The light is also used for fault indication.
각 LG compressed sensor는 PSEU SYS 1 과 2로 보내어 air/ground mode를 관리한다. 기어에 달린 센서가 PSEU에 시그널을 보내고, 시그널은 air/ground relay를 통해 항공기 각 계통의 시스템으로 가서 작동을 관장하게 된다.
PSEU의 system fault발생시 overhead panel에 PSEU amber light(지상에서만 작동)가 들어온다.
The proximity switch electronics unit (PSEU) is a component of the air/ground system. Many airplane systems send signals to the PSEU through position sensors and switches. The PSEU also controls the air/ground relays.
These are the systems/components controlled by the proximity switch electronics unit (PSEU):
• Landing gear transfer valve(Inflight-HYD B로 바꾸어 retraction, GRD- ALT nose wheel로 SW두었을때 HYD B 이용해서 steering 작동)
• Landing gear position indicating and warning(빨간불 Unsafe)
• Speedbrake deployed indication(지상에서 Down에 있는데 GRD spoiler UP 경고)
• Takeoff warning
• Door warning
• Air/ground relays.
• Airstairs control/warning
Two main landing gear compressed sensors on each main landing gear supply main landing gear shock strut compressed position signals to the air/ground system.
The main landing gear compressed sensors are on the lower area of the outer cylinder of the main landing gear. The targets are on each side of the upper torsion link where the link attaches to the outer cylinder of the main landing gear.
Two nose landing gear compressed sensors supply nose landing gear shock strut compressed position signals to the air/ground system.
The nose landing gear compressed sensors are on each side of the upper torsion link where the link attaches to the outer cylinder of the nose landing gear. The targets are on the lower area of the outer cylinder of the nose landing gear.
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