GBU-27 Paveway III

GBU-27 Paveway III is a precision-guided munition developed for the United States Air Force as a specialized bunker buster. It is a derivative of the Paveway family, integrating a hardened BLU-109 penetrator warhead with a third-generation laser guidance kit for improved accuracy against hardened, deeply buried targets. The weapon was famously employed by the Lockheed F-117 Nighthawk during Operation Desert Storm to achieve strategic effects with unprecedented precision.

Development and Design

The GBU-27 was developed in the late 1980s to address an urgent operational requirement for a penetrating munition that could be carried internally by the then-new Lockheed F-117 Nighthawk, a stealth aircraft. Engineers at Texas Instruments adapted the existing GBU-24 Paveway III guidance system to mate with the BLU-109 bomb body, creating a weapon that could fit within the Nighthawk's constrained weapons bay. The design prioritized a low-radar cross-section profile and incorporated a more sensitive seeker head and enhanced autopilot from the Paveway III series, allowing for greater off-axis targeting and improved performance in poor weather compared to earlier Paveway variants. This development was part of a broader Pentagon initiative to enhance the capabilities of the United States Air Force against formidable targets like command centers and weapons storage facilities built by nations such as Iraq.

Operational History

The GBU-27 entered combat during the opening hours of Operation Desert Storm in January 1991. Lockheed F-117 Nighthawk aircraft from the 37th Tactical Fighter Wing used the weapon to devastating effect, destroying key Iraqi air defense nodes and leadership bunkers in Baghdad with minimal collateral damage. Its most famous engagement was the successful attack on the Al-Firdos Bunker, although that mission resulted in significant civilian casualties. The Israeli Air Force has also employed the GBU-27, notably during the 2006 Lebanon War against Hezbollah targets. The munition has seen continued use in subsequent conflicts, including Operation Iraqi Freedom, where it was used by the F-15E Strike Eagle following modifications to its carriage system, demonstrating its lasting value in the United States Air Force's arsenal for striking high-value, hardened facilities.

Technical Specifications

The GBU-27 integrates a BLU-109 penetrator warhead, which weighs approximately 2,130 pounds (966 kg) and contains 550 pounds (250 kg) of Tritonal high explosive. The warhead is engineered with a hardened steel casing to penetrate several feet of reinforced concrete before detonation. Guidance is provided by the Paveway III kit, featuring a Texas Instruments laser seeker, a digital autopilot, and INS for improved navigation towards the designated target illuminated by a laser designator. The entire assembly is 176 inches (4.47 m) long. Later variants can utilize the more advanced BLU-116 Advanced Unitary Penetrator warhead. The weapon is typically released from medium altitude, with its guidance system enabling engagement from significant stand-off distances and under challenging atmospheric conditions.

Variants

The primary variant is the standard GBU-27, which uses the BLU-109 warhead. An enhanced version, the **GBU-27A/B**, incorporates improvements to the guidance and control systems. The **GBU-28** is a related but distinct bunker buster, significantly larger and developed during Operation Desert Storm for targets beyond the GBU-27's capability. A further development is the **EGBU-27**, which adds GPS/INS guidance to the existing laser seeker, creating a dual-mode weapon capable of operating in adverse weather where laser designation may be obscured. This evolution reflects the broader trend in United States Air Force munitions towards all-weather, JDAM-like capabilities within the Paveway family.

Operators

The primary operator is the United States Air Force, which has deployed the weapon from the Lockheed F-117 Nighthawk, F-15E Strike Eagle, and F-111 Aardvark. The Israeli Air Force is a significant foreign user, having integrated the GBU-27 on its F-15I Ra'am and F-16I Sufa fighter aircraft. The weapon was also evaluated by the Royal Air Force for potential use on its Panavia Tornado fleet, though it was not adopted into widespread service. Its use remains largely restricted to close allies of the United States due to its advanced technology and strategic role in counter-proliferation missions.

Category:Precision-guided munitions of the United States Category:Laser-guided bombs Category:1990 introductions