General Electric CJ805-23 & CJ805-23B Aft Fan Engine Maintenance Manual – GE Jet Engine Service & Repair Guide (PDF)

Description

The General Electric CJ805-23 and CJ805-23B Aft Fan Engine Maintenance Manual is the F.A.A.-approved service document for the GE CJ805-23 and CJ805-23B axial-flow aft-fan jet engines. Published by the General Electric Commercial Engine Division, Product Support Department, under document number GEI 67837, it was originally issued March 1, 1961 and revised through March 1, 1976. The manual covers the maintenance, troubleshooting, adjustment, inspection, and repair work that can be performed while the engine remains installed in the aircraft, together with the shop-level procedures that require engine removal.

Because the manual follows Air Transport Association Specification 100 and is written to be used alongside the aircraft maintenance manual, it supplies only the information that is to be supplied by the engine manufacturer. The result is a focused engine-side reference: engine systems, engine components, and the engine-specific procedures, limits, and tests a maintenance crew actually needs when working on a CJ805 aft fan engine.

File Details

• Manual Type: Engine Maintenance Manual
• Brand / Manufacturer: General Electric, Commercial Engine Division, Product Support Department
• Engines Covered: CJ805-23 and CJ805-23B aft fan jet engines
• Document Number: GEI 67837
• Original Issue Date: March 1, 1961
• Latest Revision Date: March 1, 1976
• Language: English
• File Format: PDF
• Page Count: 464 pages
• Approval: F.A.A. Approved

Chapters Covered

• 72-0 Complete Engine — Description and Operation, Troubleshooting, Maintenance Practices, Servicing, Removal/Installation, Adjustment/Test, Inspection/Check, Approved Repair
• 72-1 Compressor Section — Compressor Front Frame Assembly, Compressor Front Stator Casing, Compressor Stator Rear Casing, Compressor Rotor, Compressor Rear Frame
• 72-2 Combustion Section — Outer Combustion Casing, Combustion Liners, Cross-Ignition Tubes and Clamps, Transition Duct, Inner Combustion Casing, First-Stage Turbine Nozzle
• 72-3 Turbine Section — Turbine Support Ring, Turbine Stator Casings, Turbine Rotor
• 72-4 Accessory Drive Section — Inlet Gearbox, Transfer Gearbox, Drive Shafts and Housing, Rear Gearbox
• 72-5 Lubrication System — Oil Tank, Lube and Scavenge Pump, Lube and Scavenge Oil Filters, Transfer Gearbox Scavenge Pump, Rear Gearbox Scavenge Pump, No. 5 Bearing Scavenge Pump, Engine Fuel-Oil Cooler, CSD Fuel-Oil Cooler, Sump and Tank Pressurizing Valve
• 72-6 Fan Assembly — Fan Front Frame, Fan Rotor, Fan Rotor Shroud, Fan Rear Frame
• 73 Fuel and Control System — Fuel Pump, Fuel Heater, Fuel Filter, Fuel Control, Compressor Inlet Temperature Sensor, Pressurizing and Drain Valve, Fuel Nozzles, Variable Vane Actuators, Variable Vane Mechanical Feedback Assembly, Variable Stator Reset Mechanism
• 74 Ignition — Engine Ignition, Ignition Units, Ignition Cables, Igniter Plugs
• 75 Anti-Icing — Engine Air Flow, Anti-Icing Air System, Engine Anti-Icing Shutoff Valve, Anti-Icing Temperature Regulating Valve, Anti-Icing Pressure Switch

Working through the manual section by section, a technician gets the full engine-side picture of the CJ805 aft fan powerplant. The compressor chapter covers the front frame, variable inlet guide vane linkage, front and rear stator casings, rotor, and rear frame, with dimensional and blend limits for nicks, cracks, and wear. The combustion and turbine chapters describe the annular combustor hardware, transition duct, first-stage nozzle, stator casings, and the three-stage turbine rotor. The accessory drive chapter walks through the inlet gearbox, transfer gearbox, horizontal drive shaft with its damper bearing, and the rear gearbox that carries the fuel control, tachometer generator, and pumps. The lubrication chapter documents the dry-sump recirculating oil system — oil tank with its engine and CSD compartments, the lube and scavenge pump, the scavenge pumps, the engine and CSD fuel-oil coolers, and the sump and tank pressurizing valve. The fan chapter covers the free-floating single-stage fan rotor, its shroud, and the front and rear fan frames that route primary and secondary airflow. The fuel and control chapters cover the hydro-mechanical fuel control, the fuel pump, heater, filter, CIT sensor, pressurizing and drain valve, dual-cone fuel nozzles, and the variable stator actuator and feedback systems. Ignition and anti-icing round out the coverage.

Troubleshooting and Diagnostics

Section 72-0 includes an extensive troubleshooting guide organized by symptom: starting problems, idle problems, performance problems, operational problems, abnormal engine noise, oil pressure and temperature problems, anti-icing faults, faulty indications, thrust reverser system faults, fuel contamination, and reverse hang-ups. Each entry pairs a possible cause with an isolation procedure and a correction, so the technician can work from symptom to faulty component without guesswork. The troubleshooting tables reference the specific component removal or adjustment procedures elsewhere in the manual, making it a practical diagnostic companion to the chapter-level maintenance content.

Operating Limits and Adjustment Data

The adjustment and test section gives the normal operating envelope for both engines: 100 percent engine speed is 7460 rpm; take-off is limited to 103 percent; idle is 60 percent (4475 rpm) plus or minus one percent; fan speed is 6000 rpm at 100 percent, with a 99.4 percent maximum operating limit; and the engine is limited to 85 percent whenever the bypass air ducts are open for ground running. Exhaust gas temperature limits are provided for standard and low-smoke combustors across take-off, maximum continuous, and transient conditions, along with allowable over-temperature inspection thresholds, lube oil pressure and temperature ranges, maximum oil consumption, anti-icing time limits, the variable stator schedule, fuel contamination limits, and vibration limits. The fuel control idle and maximum speed adjustments, the variable stator running rig and tracking checks, and the maximum speed setting curve are all documented with step-by-step procedures.

Who This Manual Is For

This is a working reference for maintenance engineers, A&P mechanics, shop technicians, and operators supporting GE CJ805-23 and CJ805-23B aft fan engines — whether the task is a routine inspection, a fuel control change, a variable stator rigging adjustment, a borescope inspection of the compressor, or a troubleshooting session on a specific performance complaint. It is also a valuable record for aviation historians and collectors interested in the technical documentation of early commercial aft fan jet engines.

Put the CJ805 Aft Fan Engine Maintenance Manual to Work

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The General Electric CJ805-23 and CJ805-23B Aft Fan Engine Maintenance Manual gives you the procedures, limits, and inspection criteria needed to service, diagnose, adjust, and repair these engines correctly — from the variable inlet guide vane linkage and compressor rotor through the combustion section, turbine, accessory gearboxes, lubrication system, fan assembly, fuel and control system, ignition, and anti-icing. Having the correct torque values, clearances, blend limits, running rig angles, and over-limit inspection thresholds on hand protects both the engine and the crew, and keeps maintenance decisions grounded in the manufacturer’s own data rather than guesswork. Delivered as an instant PDF download, the manual can be read on any device or printed for the shop floor — no shipping, no waiting.