Cessna 340/340A 1971–2009 Installation Instruction and Service Manual OEM (P/N 34-010-61M)

• Covers the integration and maintenance of Keith Products R134a air conditioning systems for 1971–2009 Cessna 340 and 340A airframes.
• Official 21-page OEM technical report P/N 34-010-61M (original release: September 1, 1995).
• Contains four core sections: installation parameters, required publications, service workflows, and weight and balance supplement data.
• Features 7 essential reference guides: Wiring diagrams, electrical schematics, fault isolation workflows, refrigerant capacity charts, component torque values, expansion valve data, and receiver dryer criteria.
• Outlines 8 critical hangar tasks: system evacuation protocols, R134a refrigerant charging, vacuum leak testing, compressor bracket alignment, condenser blower maintenance, evaporator coil inspections, pressure switch calibration, and O-ring replacement.

Component Installation and System Architecture

Retrofitting an R134a system into a pressurized fuselage leaves no room for guesswork. This PDF documentation outlines the complete Keith Products architecture, giving technicians a practical breakdown of the Equipment Package (compressor, condenser fan, receiver dryer) alongside the Evaporator Package (blower and expansion valve). To streamline hangar floor work, the manual details critical structural modifications rather than generic overviews. You will find specific parameters for pressure bulkhead grommet routing, compressor pallet mounting, and the exact skin doubler cutouts required for proper condenser airflow. The distinct advantage of this reference is its exact spatial mapping for the Cessna 340 airframe, ensuring mechanics do not compromise the pressure vessel integrity when routing lines. It maps out the necessary electrical and structural tolerances, saving hours of research during complex installations or a major repair.

Service Specs and Workshop Maintenance

Beyond the initial retrofit, this manual provides the baseline OEM data required for long-term system upkeep and accurate troubleshooting. It covers standard refrigerant operation, condensate drain valve management, and strict inspection schedules. Shop mechanics will find the exact numbers needed for routine checks, including the required 30–35 pounds of compressor drive belt tension and 100-hour flight inspection intervals to verify mounting security and fluid levels. By following the included step-by-step instructions for system evacuation and R134a refrigerant charging, independent maintenance facilities can bypass expensive outsourced shop labor. It also provides weight and balance supplement samples, detailing the station arms and moment calculations necessary for accurate logbook entries following an A/C repair. Because modifying pressurized airframes and handling aviation refrigerants involve critical life-safety systems, these OEM structural specifications must always be reviewed and executed by a certified A&P mechanic to ensure continuous flight safety.