GBU-39 Small Diameter Bomb
The GBU-39/B Small Diameter Bomb (SDB) is a 250-pound (110 kg) precision-guided glide bomb that is intended to provide aircraft with the ability to carry a higher number of more accurate bombs. Most US Air Force aircraft will be able to carry (using the BRU-61/A rack) a pack of four SDBs in place of a single 2,000-pound (910 kg) bomb. It first entered service in 2006. The Ground Launched Small Diameter Bomb (GLSDB) was later developed to enable the SDB to be launched from a variety of ground launchers and configurations.
| GBU-39/B (Small Diameter Bomb) | |
|---|---|
4 SDBs (training/ground handling variant) loaded on an F-15E Strike Eagle | |
| Type | Glide bomb |
| Place of origin | United States |
| Service history | |
| In service | 2006–present |
| Used by | United States Israel Italy Netherlands Saudi Arabia |
| Wars | War in Afghanistan, Iraq War, Gaza War, Military intervention against ISIL, Syrian Civil War |
| Production history | |
| Manufacturer | Boeing Integrated Defense Systems |
| Unit cost | US$40,000 (SDB I, FY 2021) |
| Produced | 2005–present |
| No. built | 17,000+ |
| Variants | GBU-39/B GBU-39A/B GBU-39B/B |
| Specifications | |
| Mass | 285 lb (129 kg) |
| Length | 70.8 in (1.80 m) |
| Width | 5 ft 3.3 in (1.61 m) (wings extended) 7.5 in (190 mm) packed |
| Warhead | SDB I (GBU-39/B) penetrating blast fragmentation, penetrating steel nosecone SDB FLM (GBU-39A/B) blast ultra low fragmentation Laser SDB (GBU-39B/B) penetrating blast fragmentation, w/o steel nosecone |
| Warhead weight | All SDB I variants 206 lb (93 kg) total SDB I (GBU-39/B) Explosive fill: 36 lb (16 kg) AFX 757 Insensitive munition certified PBX Penetration: greater than 3 ft (0.91 m) of steel reinforced concrete SDB FLM (GBU-39A/B) 137 lb (62 kg) AFX 1209 MBX ("multiphase blast explosive"), composite case Laser SDB (GBU-39B/B) 36 lb (16 kg) AFX 757 enhanced blast insensitive explosive, penetrating steel case |
Operational range | All SDB I variants over 60 nmi (69 mi; 111 km) when air-dropped, 150 km (93 mi; 81 nmi) when launched as a part of the GLSDB, |
Guidance system | SDB I (GBU-39/B) SDB FLM (GBU-39A/B) GPS / INS Laser SDB (GBU-39B/B) GPS / INS with terminal semi-active laser guidance |
| Accuracy | SDB I (GBU-39) 3 ft (1 m) CEP |
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