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...fuel switches -- переключатели отсечных клапанов... электронные, через ЕЕС...
10. The fuel control module (FCM) is on the aft end of the thrust control
module
- It sends signals to open or close fuel valves to operate or shutdown the
engines
11. The FCM sends signals to the:
- Spar valve start switch relays
- Common data network (CDN).
12. The spar valve start switch relays use these signals to control the spar
valve and the high pressure shutoff valve (HPSOV) in the FMU.
13. Remote data concentrators (RDC) send fuel control module signals to the
CDN.
- The signals go to the engine electronic controller (EEC) to operate the fuel
metering unit (FMU), fuel metering valves (FMV), and high pressure shutoff
valve (HPSOV).
...
17. When the fuel control switch is set to the RUN position:
- Airplane electrical system power is removed from the FMU shut-off coil to
enable the engine fuel shutoff valve to open by the EEC command when
sufficient fuel pressure is provided by the engine rotation to open the valve
- Airplane electrical system power is supplied to the open winding of the
airplane spar valve motor
- Airplane electrical system power is supplied to the engine ignition system
which then can be turned on or off by the EEC
- Airplane electrical system power is supplied to the EEC until sufficient
power is provided by the permanent magnetic alternator (PMA)
- Airplane electrical system power is supplied to the engine monitoring unit
(EMU).
...
Fuel Control Switch
Each fuel control switch controls 2 relays in the power distribution panels. The
relays control many functions.
These are the relays:
- Engine fuel control relay 1
- Engine fuel control relay 2.
Engine fuel control relay 1 controls the fuel metering unit shutoff valve.
Engine fuel control relay 2 controls these functions:
- Spar valve control
- Fuel control switch position to the bus power control unit (BPCU)
- EEC channel reset signal
- Fire handle lock solenoid.
