Starter Figure 002 (SHEET 2)
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Starter Shutoff Valve
Figure 003
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The gear housing assembly (10) provides for installation of magnetic drain plug assembly (22), oil overflow plug (19) and oil filler plug (31). The magnetic drain plug (22) consists of an inner magnetic drain plug and an outer check valve plug. The outer check valve plug will prevent oil draining when magnetic plug is removed.
(2) Starter shutoff valve (Ref. Fig. 003A) The starter shutoff is composed of two major sections, the valve flow body section and the pneumatic actuator and control section. The valve flow body section consists of the flow body, butterfly plate shaft, bearings and seals enclosed in the valve body. The pneumatic actuators and control section consist of the controlling solenoid, diaphragms, torsion closing mechanism, shaft actuating linkage and electrical position indicating switch.
**ON A/C ALL
B. Operation
(1) Starter (Ref. Fig. 002) The inlet housing assembly (1) directs the flow of compressed air to the stator assembly (2) which, in turn, directs the air flow into the blades of turbine wheel (3), producing high speed and low torque rotation of turbine wheel (3). Exhaust air is released to ambient at approximately ambient pressure. The pinion gear (9), the 3 matched planetary gear set (25), three low speed pinions (24) and internal ring gear transform the high speed rotation with low torque of turbine wheel (3) into low speed and high torque at output shaft (17). The drive shaft assembly (17A) provides disengagement of output shaft
(17) from internal ring gear (23) after air to starter is shutoff and
when the aircraft engine speed exceeds pawl liftoff speed of drive
shaft assembly (17A), allowing output shaft (17) and drive shaft
assembly (17A) to rotate with the aircraft engine while pinion (9),
internal ring gear (23), planetary gear set (25) and turbine wheel
(3) coast to stop.
The inlet housing (1), incorporating axial containment ring (4) with
axial cutter ring (30) cutter pins, provides turbine wheel (3)
containment at speeds up to the maximum turbine free running speed.
Should the turbine wheel (3) moves axially after a thrust bearing
failure, the cutter pins (30) will cut the rim from the turbine wheel
and the separated parts shall be contained in the axial and radial
enclosed space of containment ring.
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Starter Shutoff Valve
Figure 003A
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E E The sealing of the starter is ensured at output shaft assembly (17) by a carbon seal (16). A magnetic plug (22) in the gear housing (10) provides protection for the bearings by collecting any metallic particles in lubricant, and allows to detect starter failure by inspection.
C. Starter Lubrication The lubrication is a wet sump splash system. The approved lubricating oils are those specified by the generic term of "engine oil" (Material No.CP2442). For more information, refer to the CFMI Service Bulletin 79-001 which lists the approved lubricating oils in use on the engine and its accessories.
(1) Table 001 - Physical and Operational Characteristics
-------------------------------------------------------------------------------Starter Physical and Operational Characteristics
-------------------------------------------------------------------------------Turbine Type : Single stage axial flow Reduction Gearing : Compound planetaty Internal Engagement : Pawl and ratchet type Drive Shaft Disengagement Speed : 4300 to 4500 RPM Drive Shaft Reengagement Speed : 1720 to 2800 RPM Direction of Output Shaft Rotation : CCW when viewing the starter output shaft Lubrication. System Type : Wet sump splash system Capacity : 27.0 fl oz (800 cc approximately) Lubricant Specification : Engine oil (Material No.CP2442 per CFMI SB 79-001) Inlet Air Connection : 4.00 plus or minus 0.005 in. dia. (101.6 plus or minus 0.12 mm) dia. Weight (Dry) : 38 lb max (17.25 kg max) Length (including output shaft) : 18.19 inches (462.5 mm) Diameter, including filler and drain plugs : 9.29 inches (235.96 mm) dia.
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