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GBU-39/B Small Diameter Bomb

The GBU-39/B is a small precision-guided munition. Due to its size, aircraft can carry more, and attack more targets in a single sortie. The weapon is suitable for fighter aircraft, bombers and unmanned combat aircraft (UCAV). It uses a multi-purpose warhead for penetration and blast/fragmentation effects, and is guided by a GPS-enhanced inertial navigation system. Although the SDB features a significantly smaller warhead than existing bombs, it is still adequate for many typical targets. The smaller warhead also tends to reduce collateral damage.
GBU-39/B Small Diameter Bomb Copyright © Master Sgt. Lance Cheung, U.S Air Force


In active service


Manufacturer: Boeing


Length: 1.8 meters 5.91 feet
Wingspan: 1.38 meters 4.53 feet
Diameter: 19 centimeters 7.48 inches
Weight: 129.3 kilograms 285 pounds
Warhead weight: 113.4 kilograms 250 pounds
Range: 60+ nautical miles (110+ kilometers) (69+ miles)
Warhead: multi-purpose (penetrator/blast-fragmentation)


1995 - Miniaturized Munitions Technology Demonstration (MMTD) research program started by the U.S. Air Force
1998 - Small Bomb System (SBS) prgram established (SBS later renamed to SSB (Small Smart Bomb), and finally to SDB (Small Diameter Bomb))
September 2001 - Contracts awarded to Boeing and Lockheed Martin for the competitive development of an SDB design
February 2003 - GBU-39/B first flight
October 2003 - Boeing declared as winner
April 2005 - LRIP (Low-Rate Initial Production) contract for the GBU-39/B awarded to Boeing
October 2006 - Initial Operational Capability (on the F-15E Strike Eagle)
December 2006 - First full-rate production contract awarded to Boeing