The port plates, eccentric rings, and gerotors are assembled into a surrounding concentric aluminum tubular housing that maintains all elements in proper alignment. The oil suction and discharge passages from the gerotors are brought radically through the housing to match the appropriate locations of the mating passages in the engine gearbox casting. The entire stack of port plates is retained in the housing with retaining rings at the spline end. The outermost end of the housing has an integrally cast cover. The cover bolt holes are so arranged as to properly orient the pump assembly in the gearbox housing during installation.
(6)
Chip Detector- The engine diagnostic device most likely to provide the first warning of an impending part failure is the chip detector located on the front of the accessory gearbox. The chip detector has an outer shell with an internal magnet, an electrical connector, and a removable screen. The magnet attracts magnetic particles to the detector. When these particles bridge the gap between the magnet and the outer shell, a circuit is completed which illuminates the CHIP #1 ENGINE or CHIP #2 ENGINE chip detector caution light in the cockpit.
b.
Lubrication System Flow- Oil flow is drawn from the oil tank by the lubrication and scavenge pump. From the pump, pressurized oil flows through the oil filter and into the cored passages in the accessory gearbox. Inside of the gearbox, the oil divides and flows to the A, B, and C sumps and to the accessory gearbox. Scavenge oil from the lubrication and scavenge pump then flows through the electrical chip detector. From there, the oil flows through the oil cooler and into the main frame. Scavenge oil enters a manifold at the top of the main frame. The oil then flows through the scroll vanes and back to the oil tank.
6. LEARNING STEP/ACTIVITY No. 6. Identify the operational characteristics of the engine electrical system.
a. Electrical System
(1)
Electrical System Components (Left Side). The T700-GE-700 engine uses electrically operated accessories to control anti-icing airflow, ignite the fuel-air mixture in the combustor, and control the engine power level. In addition, electrical indication and warning devices assist the pilot in engine operation. The electrical system provides: all electrical power required for engine ignition and all electrical control requirements throughout the operating range of the engine without the use of airframe power.
Interconnecting harnesses between engine electrical and diagnostic components; an accurate and stable trimming signal to the HMU to isochronously govern power turbine speed, limit maximum TGT, and share the load between engines; and a Np overspeed limiting system. Ground checking capability for the Np overspeed system is also provided.
(2)
Electrical System Components (Right Side). The electrical system also provides: engine ignition during starting; cockpit signals of gas generator speed (Ng), power turbine speed (Np), engine shaft torque (Q), power turbine inlet temperature (T4.5), fuel and oil pressure, and oil temperature. Also provided are: history counter signals of Ng and T4.5; and an engine shaft torque signal for use in the load-sharing circuit and hot start prevention.
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