HONEYWELL TURBINE ENGINE MAIN FUEL CONTROL 3883420-1 99193 SOCN 3882880 -2

HONEYWELL TURBINE ENGINE MAIN FUEL CONTROL 3883420-1 99193 SOCN 3882880 -2

HONEYWELL Turbine Engine Main Fuel Control

Part Numbers: 3883420-1 (Primary) | 3882880-2 (Associated/Overhauled/SOCN Equivalent)
Reference Codes: 99193 SOCN

SERIAL: 27897

SERIES 2

99193 SOCN 3882880 -2

SN : 031963800876

This unit is a Main Fuel Control (MFC) for a Honeywell gas turbine engine, most likely from the TFE731 or RE100 series family, which are widely used in business and regional aircraft.

1. Primary Function

The Main Fuel Control is the primary “brain” of the engine’s fuel system. Its core function is to meter and deliver a precise and controlled flow of fuel to the engine’s combustion chamber under all operating conditions. It ensures the engine receives the correct fuel for demanded thrust, while preventing overspeed, over-temperature, or surge.

2. Key Responsibilities & Operational Description

• Fuel Metering: Precisely regulates fuel flow based on inputs from the pilot’s power lever (throttle) and engine parameters.
• Engine Scheduling: Uses internal mechanisms (flyweights, governors, servo valves, and in modern units, electronic inputs) to schedule fuel flow for:
  • Acceleration: Providing extra fuel for smooth, surge-free acceleration.
  • Deceleration: Limiting fuel reduction to prevent flameout.
  • Steady-State Operation: Maintaining set engine speed (N1, N2) or power output.
• Hydromechanical Computing: The unit is a sophisticated hydromechanical computer. It uses engine bleed air (P_b) and compressor discharge pressure (P_c) as power sources and feedback signals to calculate the required fuel flow.
• Manual Control: Acts as the engine’s primary shutoff valve (HP Cock function).

3. Physical & Technical Characteristics

• Type: Integrated Hydromechanical Fuel Control Unit.
• Construction: High-grade aluminum and steel housing containing a complex assembly of:
  • Governor valves and flyweight assemblies.
  • Metering valve and servo regulators.
  • Pressure relief and shutoff valves.
  • Fuel filters and screens.
• Inputs: Power lever angle, compressor discharge pressure (P_c), burner pressure (P_b), engine shaft speeds (N1, N2).
• Output: Controlled high-pressure fuel flow to the fuel nozzles.

4. Part Number & Designation Breakdown

• 3883420-1: This is the specific manufacturer’s part number (P/N) for the fuel control assembly. The “-1” indicates an engineering revision level.
• 3882880-2: This is a closely related part number. It often represents:
  • A predecessor or compatible assembly.
  • A SOCN (Same as Original ConditioN) part supplied through an aftermarket/repair network. The unit with P/N 3883420-1 may be repaired/overhauled to the specifications of 3882880-2.
• 99193 SOCN: A key identifier.
  • 99193 is Honeywell’s internal Source Control Drawing (SCD) or Material Specification Number. This number governs the exact manufacturing, overhaul, and testing specifications for the part.
  • SOCN confirms the unit conforms to the original design and performance specifications, equivalent to a new part from Honeywell.

5. Typical Applications

This MFC is designed for specific Honeywell engines, most commonly found on aircraft such as:

• Honeywell TFE731-powered: Dassault Falcon 900/2000/50/EX, Learjet 35/36/55/60, Gulfstream G100/G150, Hawker 800/1000.
• Honeywell RE100-powered: AgustaWestland AW139 helicopter.