FUEL SYSTEMATA 73

ENGINE FUEL & CONTROL SYS - INTROD.

ENGINE FUEL AND CONTROL SYSTEM

ENGINE FUEL & CONTROL SYSTEM - GENERAL

FUEL DISTRIBUTION SYSTEM - INTROD.

FUEL DISTRIBUTION SYSTEM - GENERAL

FUEL PUMP

FUEL PUMP OPERATION

PB = 0 - 152 PSIPG = 1500 - 1700 PSI

FUEL FILTER

DISPOSABLE 10 MICRON UNIT

35±5 PSID

15±5 PSID

SERVO FUEL HEATER

60 PSID

FUEL TUBES (MANIFOLD)

30 FUEL NOZZLES

FUEL NOZZLES

IS CLOSED – LESS THAN

20 PSID

COMBUSTOR DRAIN VALVE

FUEL DISTRIBUTION SYSTEM - OPERATION

ENGINE FUEL CONTROL SYSTEM – INTROD.

ENGINE FUEL CONTROL SYSTEM - GENERAL

FUEL CONTROL SYSTEM

HYDROMECHANICAL T2 SENSOR

CONTROLS A FUEL PRESSURE SIGNAL TO THE MEC PROPORCIONAL TO THE FAN INLET TEMPERATURE FOR CORRECTING N2 AND TO LIMIT N1

CIT SENSOR

.. TO COMPUTE CORRECTED ACCELERATION FUEL FLOW AN

COMPRESSOR AIRFLOW.

HYDROMECHANICAL N1 SPEED SENSOR

.. PROVIDE A FUEL PRESURE TO THE MEC PROPORTIONAL TO FAN SPEED

MAIN ENGINE CONTROL

CONTROLS ENGINE THRUST, COMPRESSOR AIRFLOW AND

TURBINE COOLING, AND PROTECTS THE ENG FROM OVERSPEED AND

OVERPRESSURE

MAIN ENGINE CONTROL

HYDRAULIC

- CIT sensor, N1 speed sensor, T2 sensor.

MECHANICAL

- Thrust Lever. - Feedback Variable Stator Vane (VSV) & Variable Bypass Valve (VBV). ELECTRICAL

- Torquemotor (EEC). - Fuel Control Switches. - Aircraft Systems (Flight/Ground Idle solenoids). - N1 Resolver to EEC.

PNEUMATIC

- Compressor Discharge Pressure (CDP). - Ambient Pressure (PAMB).

MEC HYDROMECHANICAL OPERATION

MEC ELECTRICAL OPERATION

ELECT. FAN INLET TEMP. (T12) SENSOR

CONTROL ALTERNATOR

POWERS THE EEC AND GENERATES N2 SPEED

SIGNALS

THRUST LEVER ANGLE (TLA) TRANSDUCER

EEC DISCRETES PRINTED CIRCUIT CARD

ENGINE N2 SPEED CARDS

ELECTRONIC ENGINE CONTROL (EEC)

TO REDUCE CREW WORKLOAD BY MAINTAINING A DESIRED

TARGET N2 SPEED

EEC OPERATION

FUEL CONTROL SYSTEM OPERATION

FUEL FLOW INDICATING SYSTEM - INTROD.

FUEL FLOW TRANSMITTER

FUEL FLOW INDICATING SYSTEM - OPERATION

FUEL FILTER BYPASS INDICATION SYSTEM

ENG FUEL & CONTROL SYS - ELECT. OPERAT.

ENG FUEL & CONTROL SYS - MECH OPERAT.