AEI receives Brazilian STC approval for B737-800SF

LONDON – Aeronautical Engineers, Inc. (AEI) announced that Brazil’s Agência Nacional de Aviação Civil (ANAC) has approved AEI’s STC (ST02690LA) for the 12-pallet position B737-800SF freighter conversion.

AEI has gained FAA, CAAC, EASA, TCCA, UK CAA, CAACI (Cayman Islands), DCA (Guernsey), and now ANAC approvals for its B737-800SF.

AEI is currently the only conversion company to have ETOPS 180 approval on the 737-800 freighter conversion. Additionally, AEI can convert all 737-800 line number aircraft, including those with Flat Aft Pressure Bulkheads, and Split Scimitar winglets.

The AEI converted B737-800SF freighter offers a main deck payload of up to 52,700 lbs. (23,904 kg) and incorporates eleven full height 88” x 125” container positions, plus an additional position for an AEP/AEH.

The conversion also incorporates new floor beams aft of the wing box, a large 86” x 137” Main Cargo Door with a single vent door system.

AEI’s forward-thinking design allows for containers to be loaded into the aircraft a full 16.5” aft of the forward door jamb, ensuring ground operators have sufficient maneuvering room, which minimizes potential door and aircraft strikes.

Additionally, the AEI B737-800SF includes a flexible Ancra Cargo Loading System, a rigid 9g barrier, five supernumerary seats as standard, a galley, and a full lavatory.

AEI’s cargo door has earned a reputation for being the most robust and reliable in the conversion industry. The cargo door is hydraulically operated and actuated from the inside of the aircraft by an independent system.

Hydraulic pressure is available from two sources: a 28VDC electrically operated hydraulic pump or a manual hand pump. The door control and manual pump are located on the 9g barrier, allowing a single person to operate the door manually.

Main Attributes of AEI conversion system


  • Can accommodate eleven 88″x125″ AAA full height containers or pallets plus one AEP/AEH
  • Up to 52,700 LB (23,904 KG) Main Deck Payload (depending on Model & Aircraft Weight Limits)
  • Reinforced Floor structure for the highest average position weights in the industry
  • 86″ x 140″ cargo door
  • Single Vent Door System
  • High reliability, 28VDC, independent cargo door hydraulic system
  • Cabin windows replaced with lightweight aluminum window plugs
  • 9g rigid cargo/smoke barrier with sliding door
  • Relocated DFDR for 84.5″ + ceiling height throughout cargo compartment, including the last position
  • Stretch Formed fuselage skins
  • Five Supernumerary Seats

About AEI


Formed in 1958, Aeronautical Engineers Inc. (AEI) is the oldest conversion company in existence today.

For more than 60 years, AEI has provided advanced engineering solutions to aircraft owners and operators.

As a global leader in passenger to freighter conversions for a wide array of aircraft, AEI has developed over 130 Supplemental Type Certificates (STCs), and over 550 aircraft have been modified with AEI STCs – more than any other conversion provider.

AEI helps its customers extend aircraft life and increase the overall value of aircraft assets by continuously focusing on dependable and flexible product offerings.

AEI currently offers passenger-to-freighter conversions for the Boeing 737-800, 737-400, 737-300, MD-80 series, and CRJ200 aircraft.

AEI’s STCs have been certified by regulatory authorities around the world, including EASA, China, Canada, Russia, and Brazil.

AEI is also an FAA-approved Repair Station and performs hydraulic components repairs and overhauls. The company also offers recertification capabilities.

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