| 1005 | Aileron Gap Closure | Preferred Improvements LLC | — | 27 | Flight Controls | PMA |
| DL2-DC3-65TP | Max Gross Weight Increase | Preferred Improvements LLC | — | 20 | Consumables / Hardware | PMA |
| KT649-4 l l-850-0 | Clamp | Preferred Improvements LLC | — | 33 | Electromechanical | PMA |
| PM03111001 | Placard, Flight Compartment Part 135 Operations | Preferred Improvements LLC | — | 11 | Interior / Furnishings | PMA |
| PM03111002 | Placard, Cargo Door Part 135 Operations | Preferred Improvements LLC | — | 11 | Interior / Furnishings | PMA |
| PM03111015 | Placard, Cargo Door, Part 91 Operations | Preferred Improvements LLC | — | 52 | Structures | PMA |
| PM03341001 | Gear Latch/Ground Shift System | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| PM2114497 | Cabin Window Gasket | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| PM4115404 | Windshield Side Glass Assy. | Preferred Improvements LLC | — | 56 | Structures | PMA |
| PM5112045-2 | Fuselage Station 294.5 Frame Channel | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| PM5112045-4 | Fuselage Station 294.5 Frame Channel | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| PM5112046-2 | Fuselage Station 294.5 Frame Channel | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| PM5112046-4 | Fuselage Station 294.5 Frame Channel | Preferred Improvements LLC | — | 25 | Interior / Furnishings | PMA |
| SA211CE | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-113 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-139 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-15 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-307 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-422 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-434 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-461 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-52 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3-78 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA3074NM | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA4-220 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA4-228 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| SA4-230 | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04050CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04244CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04261CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04262CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04263CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04530AT | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST04605CH | — | Preferred Improvements LLC | — | — | unknown | OEM |
| ST565CH | — | Preferred Improvements LLC | — | — | unknown | OEM |