| 3400268-3 | Hose Assy | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400268-5 | Hose Assy | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400268-7 | Hose Assy | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400268-9 | Hose Assy | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400269-1 | Compressor Scoop Assy | O&N Aircraft Modifications Inc | — | 72 | Engine Accessories | PMA |
| 3400269-10 | Plate | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400269-12 | Panel Assy | O&N Aircraft Modifications Inc | — | 25 | Interior / Furnishings | PMA |
| 3400269-6 | A/C Cover Assy | O&N Aircraft Modifications Inc | — | 25 | Interior / Furnishings | PMA |
| 3400269-9 | A/C Cover | O&N Aircraft Modifications Inc | — | 20 | Consumables / Hardware | PMA |
| 3400300-1 | DC Power System Wiring Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400301-1 | DC power System Installation | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400305-1 | Left Engine Electrical Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400305-2 | Right Engine Electrical Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400306-1 | Engine Electrical System Install (Left Engine) | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400306-2 | Engine Electrical System Install (Right Engine) | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400306-3 | Engine Electrical System Install (Cabin) | O&N Aircraft Modifications Inc | — | 25 | Interior / Furnishings | PMA |
| 3400307-1 | Switching Interface P101 Connector Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400310-1 | Left Engine Instruments Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400310-2 | Right Engine Instruments Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400315-1 | Annunciator System Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400325-1 | LH Fuel Transfer System Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400325-2 | RH Fuel Transfer System Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400350-1 | LH Wing Interface Connector Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 3400350-2 | RH Wing Interface Connector Components | O&N Aircraft Modifications Inc | — | 57 | Structures | PMA |
| 3400355-1 | Circuit Breaker Panel Interface Components | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 4207 | Large A/C Vent | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 4506-1 | Back Ring | O&N Aircraft Modifications Inc | — | 20 | Consumables / Hardware | PMA |
| 4506-11 | Tube Assy | O&N Aircraft Modifications Inc | — | — | Unknown | PMA |
| 4506-13 | Modified Fitting | O&N Aircraft Modifications Inc | — | 53 | Structural / Airframe | PMA |
| 4506-2 | Back Ring | O&N Aircraft Modifications Inc | — | 20 | Consumables / Hardware | PMA |
| 4506-3 | Braided Hose Assy | O&N Aircraft Modifications Inc | — | — | Unknown | PMA |
| 4506-4 | Braided Hose Assy | O&N Aircraft Modifications Inc | — | — | Unknown | PMA |
| 4506-5 | Braided Hose Assy | O&N Aircraft Modifications Inc | — | — | Unknown | PMA |
| 4508-2 | Placard | O&N Aircraft Modifications Inc | — | 11 | Placards / Markings | PMA |
| 4510080 | Condenser | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| 67-830-1 | Hot Prop De-Ice System | O&N Aircraft Modifications Inc | — | 30 | Electromechanical | PMA |
| 7931-67-830-2 | Air Frame De-Ice Kit | O&N Aircraft Modifications Inc | — | 30 | Electromechanical | PMA |
| 95518-02 | Engine Isolator | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| AE2463532E0130 | Hose (Fuel Press.) | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| AE3663161E0174 | Hose (Torque) | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| AE3663161E0196 | Hose (Oil Press.) | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| D-5771-P | Spinner Dome | O&N Aircraft Modifications Inc | — | 20 | unknown | PMA |
| Dwg ON-42000 Report No. ON-1014 "Twin Cessna 18.5 Gal. Wing Locker Fuel Transfer System" | Unknown | O&N Aircraft Modifications Inc | | 28 | Fuel Systems | PMA |
| EC | Wire Packet | O&N Aircraft Modifications Inc | — | 24 | Unknown | PMA |
| HC-B3TF-7A/T9212DNK-7 | Propeller | O&N Aircraft Modifications Inc | — | 61 | Engine Accessories | PMA |
| O&N Aircraft Modifications Installation Dwg List ON-A100 | Low Fuel Warning Device | O&N Aircraft Modifications Inc | | 28 | Fuel Systems | PMA |
| O&N Aircraft Modifications Master Dwg List ON-10000 | Control Surface Modification | O&N Aircraft Modifications Inc | | 27 | Flight Controls | PMA |
| Parts Listed in Nayak Aircraft Drawing List 25500 dated 3/15/1971, or later FAA approved revisions | Nacelle Fuel Tank | O&N Aircraft Modifications Inc | — | 28 | Fuel Systems | PMA |
| Parts listed in O&N Aircraft Modifications Report Manufacturing Drawing List No. B-500A | Auxiliary Bladder | O&N Aircraft Modifications Inc | | 28 | Fuel | PMA |
| Parts listed in O&N Aircraft Modifications Report Manufacturing Drawing List No. B-800A | Auxiliary Bladder | O&N Aircraft Modifications Inc | | 28 | Fuel Systems | PMA |