Lockheed C-46 Commando

Lockheed C-46 Commando
Name	Lockheed C-46 Commando
Caption	A C-46 Commando in flight
Role	Transport aircraft
Manufacturer	Lockheed Corporation
First flight	1939
Introduced	1942
Primary users	United States Army Air Forces, Civil Air Transport, Cathay Pacific

Lockheed C-46 Commando The Lockheed C-46 Commando was a twin-engine transport produced by Lockheed Corporation that served prominently with the United States Army Air Forces during World War II and in subsequent Korean War and postwar operations. Designed to carry cargo, passengers, and fuel over long distances, the aircraft became notable for its large cargo capacity and its use on high-altitude air routes such as the Hump (WWII) airlift over the Himalayas. The type was operated by military, civil, and commercial organizations including United States Air Force, Civil Air Transport, and several international carriers.

Development and Design

Lockheed's design evolved from the Model 14 Super Electra commercial airliner produced by Lockheed Corporation and the development program involved design teams led by engineers from Skunk Works and Lockheed's Burbank facility. Initial flights in 1939 preceded adaptations for transport roles requested by the United States Army Air Corps amid pre-war expansion influenced by planners in War Department procurement. Structural design emphasized a capacious fuselage with large cargo doors, strengthened floor beams, and twin Pratt & Whitney R-2800 radial engines that traced development lineage to powerplants used on the F6F Hellcat and P-47 Thunderbolt. Aerodynamic refinements included a high-mounted wing and retractable landing gear derived from Lockheed's earlier transport experience and influenced by work on the Lockheed Hudson. Production involved subcontractors across the United States, coordinated under contracts negotiated with the War Production Board.

Operational History

The C-46 entered service with the United States Army Air Forces in 1942 and was deployed in multiple theaters including the China Burma India Theater where it flew the hazardous Hump (WWII) route between India and China. Crews from units such as the Air Transport Command and units operating under Fifth Air Force used the Commando to deliver supplies to Kunming, Chungking, and forward bases, often encountering monsoon weather, high-altitude icing, and enemy fighters like the Imperial Japanese Army Air Service and Imperial Japanese Navy Air Service. Postwar, the type served in the Berlin Airlift period indirectly through surplus sales and was reactivated for the Korean War by United States Air Force transport wings operating from Johnson Air Base and other Pacific installations. International operators included Civil Air Transport during the Chinese Civil War aftermath and carriers such as Cathay Pacific and Pan American World Airways in regional freight and passenger roles.

Variants

Production variants reflected military and civil requirements: early military models adapted from civil prototypes were standardized as C-46A, with reinforced structures and long-range fuel tanks similar to equipment used on B-17 Flying Fortress ferry missions. Later versions, including the C-46D and C-46F, featured cargo door modifications, improved environmental systems influenced by lessons from C-47 Skytrain operations, and avionics upgrades comparable to contemporary transports like the Douglas DC-4. Specialized conversions by civil operators included passenger freighter variants used by Korean Air and cargo configurations for Federal Express-style operations. Individual airframes were re-engined, reconfigured for aerial survey work for companies such as Pan American World Airways subsidiaries, and modified for air-sea rescue support similar to missions flown by the Air Rescue Service.

Technical Specifications

The C-46's technical package combined large internal volume with powerful propulsion: two Pratt & Whitney R-2800 Double Wasp radial engines produced performance comparable to other heavy transports like the Consolidated B-24 Liberator in cruise capability. Typical specifications included a high-mounted wing, tricycle landing gear akin to designs from Douglas Aircraft Company, and a fuselage cross-section allowing palletized cargo and up to several dozen troops or medical evacuation litters similar to configurations used by C-47 Skytrain medevac sorties. Range and ceiling allowed strategic ferry missions between bases such as Wheeling-area factories and forward theaters; avionics and electrical systems were updated postwar to meet standards set by civil aviation authorities including Civil Aeronautics Board and later Federal Aviation Administration regulations.

Civilian and Postwar Use

After World War II, surplus C-46 airframes were sold to civil operators, with airlines like Cathay Pacific, Civil Air Transport, and regional cargo firms converting them for freight, charters, and passenger service on routes in Asia, South America, and the United States. Operators adapted airframes for aerial application, cargo hauling to remote mining operations near Siberia and Alaska, and for film and photographic survey assignments contracted by studios and agencies in Hollywood and National Geographic Society projects. Commuter and bush operators valued the Commando's payload and STOL-like performance on unimproved strips in regions served by carriers such as Pacific Western Airlines and various South American operators until progressive regulation and newer turboprops like the Fairchild F-27 and Lockheed L-188 Electra reduced its civil prevalence.

Accidents and Incidents

The C-46 experienced numerous accidents influenced by its demanding wartime use and postwar operations into austere environments; incidents involved weather-related losses over the Himalayas, controlled flight into terrain in mountainous regions near Kunming and Chungking, and mechanical failures linked to early production metallurgy and maintenance challenges reminiscent of issues faced by B-24 Liberator operators. High-profile crashes attracted investigations by authorities including the Civil Aeronautics Board and later the Federal Aviation Administration, leading to safety directives for operators like Civil Air Transport and airworthiness bulletins issued by Lockheed Corporation. Despite a record of incidents, many airframes continued decades of service in remote operations until retirement or conversion to static displays in museums such as the National Air and Space Museum and regional aviation heritage centers.

Category:Lockheed aircraft Category:World War II transport aircraft