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(4)
Accessory Section Module-The accessory section module, also known as the AGB, is an Ng powered gear box that drives the engine accessories. The AGB mounts across the top of the cold section module with components that are driven by the PTO gear and radial drive shaft. The components on the front and rear face of the AGB are driven relative to the Ng speed so RPM, temperatures, and pressures associated with them will correlate up and down with the Ng speed.
(a)
On the front face are pads for the alternator and fuel boost pump. A cavity is provided for the lube and scavenge pump, and chip detector. Pads are supplied for the oil cooler, and fuel and lube filters. Cored passages in the AGB housing convey fuel and oil between components.
1.
Oil Temperature Detector-The oil temperature detector, or sensor, transmits oil temperature to the cockpit (CDU via SDC), the "Eng. oil temp" caution light illuminates at 150o C.
2.
Oil Pressure Transmitter-The oil pressure transmitter, or sensor, transmits oil pressure to the cockpit (CDU via SDC), the "Eng. oil press" caution light illuminates at 20 psi.
3.
Oil Filter-The oil filter has an impending bypass indicator button and a bypass switch, which illuminates the "oil filter bypass" caution light when oil filter is nearly/fully, clogged. A relief valve routes cold/thick oil around the filter until the oil heats up.
4.
Chip Detector-The chip detector monitors the scavenge oil stream for metallic particles, and illuminates "engine chip" caution light.
5.
Oil Cooler-The oil cooler is a liquid-to-liquid heat exchanger that uses fuel to cool engine oil. A relief valve routes cold/thick oil around the cooler until oil heats up.
6.
Fuel Filter-The fuel filter has an impending bypass indicator button and a bypass switch, which illuminates the "fuel filter bypass" caution light when the filter becomes fully clogged.
7.
Fuel Boost Pump-The engine driven fuel boost pump is designed to suction fuel from selected fuel cell and feed fuel to the HMU.
8.
Oil Pump-The oil pump is a seven element pump that pumps/scavenges engine oil.
9.
Alternator-The alternator forwards an Ng signal to the cockpit (PDU via SDC), and
supplies electrical power to the engine ignition and Electrical Control Unit (ECU).
(b) The rear face provides drive pads for the engine starter, hydromechanical unit, inlet particle separator blower, and a face ported pad for the overspeed and drain valve.
1.
POU-The pressurizing and overspeed unit provides flow dividing/purging functions between start and main fuel manifolds/nozzles, it also has an ECU actuated, solenoid controlled valve that reduces fuel flow to prevent power turbine overspeed (106 ± 1%).
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