(2)
Controls the engine thrust parameters with the thrust lever position
(3)
Limits acceleration and deceleration
(4)
Limits N1 and N2 rotor speed and burner pressure
(5)
Controls variable stator vane (VSV) scheduling
(6)
Controls bleed valve operation
(7)
Controls HPC secondary flow
(8)
Controls turbine blade and vane cooling
(9)
Controls turbine case cooling
(10)
Controls engine oil cooling
(11)
Controls fuel temperature
(12)
Supplies servo fuel pressure for hydromechanical valves and actuators
(13)
Supplies engine indication and crew alerting data
(14)
Supplies system status and fault messages
(15)
Supplies automatic engine starting when used
B.
The fuel control system includes the primary components that follow:
(1)
Electronic engine control (EEC)
(2)
Fuel metering unit (FMU)
(3)
EEC alternator (N2 Transducer)
(4)
EEC speed transducer (N1)
(5)
EEC inlet total pressure/temperature (PT2/TT2) probe
(6)
EEC programming plug
(7)
Thermocouple probe for the EEC fuel temperature
(8)
Thermocouple probe for the EEC oil temperature
(9)
EEC thermocouple probe (TT3)
(10)
EEC wiring harnesses
(11)
Supplemental control unit (SCU)
(12)
SCU programming plug
2. Electronic Engine Control (EEC) (Fig. 1 and 2)
_______________________________
A. The EEC is a full authority, dual channel, digital, electronic engine control. It is installed, with vibration isolated mounts, on the fan case at the 1 o'clock position.
B. Each channel of the EEC (channel A and channel B) has its own proccessor, power supply, program memory, and input/output function.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
PLUG (J9DEP) EEC PROGRAMMING J5A/F ENGINE CONTROL ELECTRONIC (EEC)
J2FCU J1A/F J3ENG J8PWR J7ENG J6FCU
J4PWR
PB
P5 PAMB PT2
J1
J2 J3 PLUG (J4) PROGRAMMING SCU SUPPLEMENTAL CONTROL UNIT (SCU)
J5 PT2.5 FWD
FAN CASE
A
Fuel Control System Component Location Figure 1 (Sheet 1)
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SEE B
SEE D (SHT 3)
SEE H (SHT 4)
DIFFUSER AND COMBUSTOR CASE
SEEC
FWD B
EEC THERMOCOUPLE PROBE (TT3)
C
Fuel Control System Component Location Figure 1 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
ELECTRICAL CONNECTORS
FMU FUEL OUTLET
SEE F MAIN GEARBOX (REF) FUEL PUMP SEE D E FUEL METERING UNIT (FMU) FWD UNIT FUEL METERING FUEL PUMP
EEC FUEL TEMPERATURE THERMOCOUPLE PROBE
EEC WIRING HARNESS LUGS SEE G FWD
PF SUPPLY PORT
E
FUEL FILTER HOUSING F FWD
Fuel Control System Component Location Figure 1 (Sheet 3)
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