Alpine Aerotech Ltd. is a Bell Platinum CSF. The Aeronautical Accessories Brand is proud to distribute Alpine Aerotech's quality products, which are endorsed by OEMs. AAL replaces the existing OEM access door with a new 5.6" x 10.2" Main Shaft Access Door - more than double the size of the OEM. These doors offer quick access to the oil cooler hydraulic line area, resulting in faster visual inspections and lowered maintenance costs. Door assemblies are easily opened with 1/4 turn Dzus fasteners and come with anti-chafe tape to prevent wear and fretting. Main Shaft Access Doors are supplied complete with comprehensive installation instructions, maintenance manual supplement, all hardware required for field fitment, copies of TC and FAA Approvals and certification. All workmanship and materials are warrantied by Alpine Aerotech for 1 year or 1000 hours of service (whichever comes first) after date of purchase.