Boeing’s GBU-39 Small Diameter Bomb: FY 2011 Orders
Nov 1/10: Boeing in St. Louis, MO receives a $106.4 million contract modification, exercising the Production Lot 7 (FY 2011) option for GBU-39 small diameter bombs, carriages, and technical support. At this time, the entire amount has been committed by the AAC/EBMK at Eglin Air Force Base, FL (FA8672-11-C-0034). Boeing’s Nov 9/10 release states that Lot 7 covers 2,700 GBU-39s and 280 GBU-61 carriages. Production Lots 1-5 delivered approximately 7,000 bombs and 1,200 carriages to the USAF, and Lot 6 production of 2,613 bombs and 472 carriages is more than 3 months ahead of schedule.
Unlike Raytheon’s GBU-53 SDB-II, Boeing’s SDB-I isn’t designed to attack moving targets. Instead, this GPS-guided weapon is more like the Joint Direct Attack Munition (JDAM), with a number of key design modifications. This specially shaped 250-pound bomb’s thin and pointed shape gives it extra punch against buildings and hardened targets, even though its warhead is only 50 pounds of explosive. Its pop-out glide wings and guidance set give it extended range, depending on the launching aircraft’s speed and altitude. The bombs are carried on a smart BRU-61/A 4-rack carriage, or in the internal weapon bay of planes like the F-22A Raptor. Either way, the SDB-I’s weight and compact design let aircraft carry far more smart bombs than they could otherwise.