Piper PA-23-235 Apache & PA-23-250 Aztec 1960-1981 Service Manual OEM (P/N 753-564)

• Covers 1960–1981 Piper PA-23-235 Apache and PA-23-250 Aztec variants, including 14-volt, 28-volt, and six-place configurations.
• Official Piper Aircraft publication (P/N 753-564, reissued February 1981), containing all interim updates for the production run, including specialized turbocharger and oxygen systems.
• 1,309 pages featuring 52 exploded-view diagrams, 35 fuel and hydraulic schematics, and 23 comprehensive torque and service-limit tables.

Documented Aircraft Systems

This official reference details the inspection, handling, and structural verification requirements for the PA-23 twin-engine monoplane series. It directly supports daily shop work by providing exact factory baselines. Whether you are troubleshooting landing gear hydraulics, calibrating fuel systems, or repairing cabin environmental controls, the documentation eliminates guesswork. Power plant servicing data covers both carburetor and fuel injection setups extensively. Additionally, the electrical section maps out generator and alternator configurations across the entire Apache and Aztec airframe life cycle.

Specifications and Reference Data

For precise bench work and line maintenance, the manual supplies essential tolerances and factory specifications. Mechanics rely on these charts for multi-stage bolt torque values and landing gear service limits. This includes specific tire pressures for 4-ply and 6-ply configurations, ranging from 27 to 46 psi. You will also find engine oil sump capacities listed at exactly 12 U.S. quarts. Further reference materials detail cable tension settings, consumable material vendor listings, and oxygen bottle pressures relative to ambient temperature.

Aviation safety remains paramount. This documentation serves as a vital reference tool for theory and system familiarization. Always verify procedures against the latest FAA-mandated service bulletins and consult certified A&P mechanics before initiating active maintenance on any aircraft.