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B. Description and Operation (Ref. Fig. 017) The BSV is a poppet type shutoff valve that is opened or closed by fuel pressure (PC or PCR) from the HMU based on ECU logic. The main poppet valve allows metered fuel delivery to the staged manifold and under most conditions is set to the open (unstaged) position. A check valve inside the BSV overrides and/or holds the main poppet valve open to assure that all 20 fuel nozzles are used for takeoff or other high power operations when inlet pressure is high (when P22 reaches 200 to 300 psi) (13.79 to
20.68 bar). The burner staging valve stages on 10 nozzles when a lower Fuel Air Ratio (FAR) is required by the ECU. This ensures that there is adequate decel capability in the decel schedule. Dual switches in the BSV monitor the position of the valve and transmit a feedback indication to the ECU. The switches are open when the valve is open (unstaged). After the ECU logic has determined that a lower FAR is required, the BSV is staged to 10 nozzles through the HMU BSV solenoid. If the ECU receives a valid signal from the BSV feedback switches that the BSV did stage, the ECU logic then lowers the FAR in the decel schedule to ensure a constant rate of engine deceleration. In operating conditions where a low FAR is required, the design of the fuel nozzles provides the necessary spray pattern to ensure that the engine will decel properly and that adequate flame out margin is maintained.
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8. Fuel Manifold
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R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-211,
A. General The fuel manifold supplies metered fuel to the twenty fuel nozzles and drains any fuel that may leak from the fuel supply connection lines.
B. Description and Operation The fuel manifold consists of a manifold supplying fuel to ten fuel nozzles that is unstaged or staged (depending on BSV position), a staged manifold that always supplies fuel to the remaining ten fuel nozzles when the engine is in operation, and a drain manifold. Fuel nozzles on the two fuel manifolds are located in an alternating pattern. Each manifold is divided into two segments joined by connecting nuts at the 6 and 12 o'clock positions. The fuel supply manifold halves are connected to supply lines from the BSV at the 5 and 6 o'clock positions. Each of the connections has individual drain lines. This fuel supply splitting limits fuel pressure drop across lines and facilitates removal/installation operations.
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Burner Staging Valve
Figure 017
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E E201-211, May 01/05 E E ECES E A drain function is performed at each fuel nozzle connection by a shroud sealed by two o-rings. The shrouds are connected to the main drain manifold by fifteen integral and five removable drain lines. The five removable drain tubes are to facilitate access to borescope ports. A drain line connected to the aircraft drain mast is attached to the drain manifold at the 7 o'clock position.
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R **ON A/C 106-149, 212-299, 301-399, 401-499,
A. General The fuel manifold supplies metered fuel to the twenty fuel nozzles and drains any fuel that may leak from the fuel supply connection lines.
B. Description and Operation The fuel manifold consists of a manifold supplying fuel to ten fuel nozzles, a staged manifold that always supplies fuel to the remaining ten fuel nozzles when the engine is in operation, and a drain manifold. Fuel nozzles on the two fuel manifolds are located in an alternating pattern. Each manifold is divided into two segments joined by connecting nuts at the 6 and 12 o'clock positions. The fuel supply manifold halves are connected to supply lines. Each of the connections has individual drain lines. This fuel supply splitting limits fuel pressure drop across lines and facilitates removal/installation operations. A drain function is performed at each fuel nozzle connection by a shroud sealed by two o-rings. The shrouds are connected to the main drain manifold by fifteen integral and five removable drain lines. The five removable drain tubes are to facilitate access to borescope ports. A drain line connected to the aircraft drain mast is attached to the drain manifold at the 7 o'clock position.
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9. Fuel Nozzle
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A. General (Ref. Fig. 018) The fuel nozzles are installed into the combustion case assembly. They are connected to the fuel manifold assembly. The 20 fuel nozzles deliver fuel into the combustor in a spray pattern. This provides good light-off and efficient burning at high power. Four of the 20 fuel nozzles (position 7, 8, 14 and 15) have a wider primary spray pattern to provide enhanced altitude relight reliability.
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