Station 3

Station 3

Station 3:Left Side of Main Gear Box

(1)Oil Temperature Switch of Left Engine TW-9(47E):It senses the oil temperature of the left engine.The warning indicator lights up when the temperature exceeds 130℃.

Key Points to Check:appearance,installation,cable plug(s),cable(s)and leakage.

(2)Nr Magnetic Sensor(832E):It senses rotation rate of the rotor and transmits warning signals to the horn warning annunciator and 7α panel.The low-pitch warning sound is 85Hz-172.5Hz when Nr is between 170r/min and 345r/min;the high-pitch warning sound is 190Hz when Nr is over 380r/min.

Key Points to Check:appearance,installation,cable plug(s)and cable(s).

(3)MGB Oil Pressure Sensor CY-YZ-0101-0.3(17E):It measures the oil pressure of the MGB.It is connected to the EPU.

Key Points to Check:appearance,installation,cable plug(s),cable(s)and leakage.

(4)MGB Oil Pressure Switch(16E):It lights up the warning indicator when the oil pressure drops below 0.08MPa.

Key Points to Check:appearance,installation,cable plug(s)and cable(s).

(5)Main Servo Seizure Microswitch:It is a warning device to indicate the failure of the rotary valve.It sends warning signals and lights up indicator“SERVO”to warn the pilot.

Key Points to Check:appearance,installation,cable plug(s)and cable(s).

(6)Angular Displacement Sensor:It senses and transmits the position signals of the transmission system to the flight data system.There are no electrical symbols for additional retrofitted devices.

Key Points to Check:appearance,installation and cable(s).

(7)Oil Temperature Sensor of Left Engine GWR-2A(21E):It senses and converts the oil temperature of the left engine into electric signals,and transmits the signals to the EPU for processing and display.

Key Points to Check:appearance,installation,cable plug(s),cable(s)and leakage.

(8)Fuel Filter Blockage Sensor(18Q):Indicator“FILT”on 3Q panel and indicator“FUEL”on 7α panel light up when the pressure difference is over 140±20mbar.

Key Points to Check:appearance,installation,cable plug(s),cable(s),and leakage.

(9)Fuel Pressure Switch(14Q):It senses the fuel pressure at the outlet of the low-pressure pump.When the pressure is lower than 0.2bar,it lights up indicator“FUEL”on 7α panel and indicator“FUEL.P”on 3Q panel.

Key Points to Check:appearance,installation,cable plug(s),cable(s)and leakage.

(10)Fuel Pressure Sensor CY-YZ-0101-0.2(17Q):Its resistance value changes with the fuel pressure.The sensor transmits the corresponding voltage signals to the EPU and the EPD will display the processed signals.Range of measurement:0-0.2MPa.

Key Points to Check:appearance,installation,cable plug(s),cable(s)and leakage.