| Description | Part# | Item Desc | Price |
| STC'S & MODIFICATIONS | |||
| R101 | AA1 series engine upgrade STC to O-290 or O-320. PAPERWORK ONLY |
500.00 | |
| R102 | AA1 Series gross weight | 150.00 | |
| R501 | AA5/AA5A O-320 High compression Piston upgrade STC | 500.00 | |
| R209 | Aviation Development Corporation Oil Filtration System | ||
| R2091 | O-320/O-360 Engine Adapter For R209 ADC Oil Filter System |
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| R2092 | O-235 Engine adapter for R209 ADC Oil Filter System |
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| ADC310-1 | Aviation Development Corp. Oil cooler adapter kit for AA1 Through AA1B |
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| R507 | Split Nose Cowl STC '75 Traveler, AA5A and AA5B | 175.00 | |
| R507-1 | Split Nose Cowl STC '72 - '74 Traveler | 175.00 | |
| R108 | Split Nose Cowl STC AA1 through AA1B | 175.00 | |
| R1081 | Split Nose Cowl STC AA1C | 175.00 | |
| R106 | Hinged upper engine cowling STC for AA1 through AA1C. Provides convenient access to engine compartment from the top without having to remove the top engine cowling. | 200.00 |
