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A-10/OA-10 Thunderbolt II

On 24 February 2014 Defense Secretary Chuck Hagel proposed cuts in military spending that include further reductions in troop strength and force structure. Within the Air Force, the defense budget calls for saving $3.5 billion by retiring the A-10 fleet and replacing it with the F-35 by the early 2020s. In addition, the service also will retire the 50 year-old U-2 surveillance plane in favor of the unmanned Global Hawk. The Army Guards Apache attack helicopters would be transferred to the active force, while Black Hawk helicopters would be transferred to the National Guard, part of a broader realignment of Army aviation designed to modernize the fleet and increase capability.

Defense Secretary Chucke Hagel said in a 24 February 2014 briefing: "The Warthog [A-10] is a venerable platform, and this was a tough decision. But the A-10 is a 40-year-old single-purpose airplane originally designed to kill enemy tanks on a Cold War battlefield; it cannot survive or operate effectively where there are more advanced aircraft or air defenses. And as we saw in Iraq and Afghanistan, the advent of precision munitions means that many more types of aircraft can now provide effective close air support, from B-1 bombers to remotely piloted aircraft, and these aircraft can execute more than one mission. The A-10's age is also making it much more difficult and costly to maintain. Significant savings are only possible through eliminating the entire fleet, because of the fixed cost of maintaining the support apparatus associated with that aircraft. Keeping a smaller number of A-10s would only delay the inevitable while forcing worse trade-offs elsewhere."

With the Pentagon facing billions of dollars in cuts because of the across-the-board and indiscriminate sequestration cuts, by 2013 the Air Force was considering getting rid of all A-10s in a money-saving move. The Air Force had cut or was cutting three squadrons of A-10s at Barksdale Air Force Base, Louisiana; Spangdahlem Air Base, Germany; and Fort Smith, Arkansas. Moreover, based on reports related to the Air Force's FY 2015 proposals for the A-10 and an apparent Air Force document entitled "CAF Force Generation Model" (dated 19 Jul 2013), there were concerns that the Air Force's effort to divest the A-10 may be accelerating.

Such an Air Force divestment of the A-10 would run counter to a long-standing congressional belief that the A-10's past combat performance, low operating costs, and unique CAS capabilities warrant the allocation of finite resources to ensure the A-10 remains part of the fleet for years to come. That is why Congress blocked the Air Force's effort to cut A-10 force structure even deeper in FY 2013. In November 2013 a bipartisan, bicameral group of U.S. Senators and Members of Congress sent a letter to Secretary of Defense Chuck Hagel and Chairman of the Joint Chiefs of Staff, General Martin Dempsey, expressing concerns that a premature divestment of the A-10 Thunderbolt II by the Air Force would create a dangerous close air support capability gap that could unnecessarily endanger American service members in future conflicts.

The A-10 and OA-10 Thunderbolt IIs are the first Air Force aircraft specially designed for close air support of ground forces. They are simple, effective and survivable twin-engine jet aircraft that can be used against all ground targets, including tanks and other armored vehicles. The primary mission of the A-10 is to provide day and night close air combat support for friendly land forces and to act as forward air controller (FAC) to coordinate and direct friendly air forces in support of land forces. The A-10 has a secondary mission of supporting search and rescue and Special Forces operations. It also possesses a limited capability to perform certain types of interdiction. All of these missions may take place in a high or low threat environment.

The A/OA-10 aircraft was specifically developed as a close air support aircraft with reliability and maintainability as major design considerations. The Air Force requirements documents emphasized payload, low altitude flying capability, range and loiter capability, low speed maneuverability and weapons delivery accuracy. The A-10 is slow enough to be an observation plane. This greatly increases the A-10's effectiveness at protecting ground troops.

The A/OA-10 is a single place, pressurized, low wing and tail aircraft with two General Electric TF-34-100/A turbo-fan engines, each with a sea level static thrust rating of approximately 9000 pounds. The engines are installed in nacelles mounted on pylons extending from the fuselage just aft of and above the wing. Two vertical stabilizers are located at the outboard tips of the horizontal stabilizers. The forward retracting tricycle landing gear incorporates short struts and a wide tread. The nose wheel retracts fully into the fuselage nose. The main gear retracts into streamlined fairing on the wing with the lower portion of the wheel protruding to facilitate emergency gear-up landings.

The A-10's survivability in the close air support arena greatly exceeds that of previous Air Force aircraft. The A-10 is designed to survive even the most disastrous damage and finish the mission by landing on an unimproved airfield. Specific survivability features include titanium armor plated cockpit, redundant flight control system separated by fuel tanks, manual reversion mode for flight controls, foam filled fuel tanks, ballistic foam void fillers, and a redundant primary structure providing "get home" capability after being hit.

All of the A-10's glass is bulletproof and the cockpit itself is surrounded by a heavy tub of titanium. Titanium armor protects both the pilot and critical areas of the flight control system. This titanium "bathtub" can survive direct hits from armor-piercing and high explosive projectiles up to 37mm in size. The front windscreen can withstand up to a 23mm projectile. Fire retardant foam protects the fuel cells which are also self sealing in the event of puncture.

The redundant primary structural sections allow the aircraft to enjoy better survivability during close air support than did previous aircraft. Designers separated all of the crucial battle and flight systems. The wheels can roll in their pods, which lets the plane perform belly landings without significant damage to the aircraft. Dual engines are mounted away from the Warthog's fuselage; if one is destroyed, the other can propel the craft to safety. Dual vertical stabilizers shield the hot exhaust from Russian-designed heat seeking missiles. The A-10 has two hydraulic flight control systems, backed up by a manual flight control system. This redundancy allows the pilot to control a battle damaged aircraft, even after losing all hydraulic power. Furthermore, redundant primary structural and control surfaces enhance survivability. Lastly, the long low-set wings are designed to allow flight, even if half a wing is completely blown off. No other modern aircraft -- including the F-16 -- can survive such punishment. The wings themselves are set low to allow for more weaponry to fit beneath the aircraft.

The General Electric Aircraft Armament Subsystem A/A49E-6 (30 millimeter Gun System) is located in the forward nose section of the fuselage. The gun system consists of the 30mm Gatling gun mechanism, double-ended linkless ammunition feed, storage assembly and hydraulic drive system. The General Electric GAU-8/A 30mm seven barrel cannon, specifically designed for the A-10, provides unmatched tank killing capability. The gun fires armor-piercing projectiles capable of penetrating heavy armor. It also fires a high explosive incendiary round, which is extremely effective against soft skinned targets like trucks. The cannon fires at a rate of 4,200 rounds per minute. The A-10's maneuverability, teamed with the gun's accuracy, allows the pilot quick reaction with lethal effects. Other weapons include the AGM-65 Maverick and AIM-9 Sidewinder missiles.

Thunderbolt IIs have Night Vision Imaging Systems (NVIS), compatible single-seat cockpits forward of their wings and a large bubble canopy which provides pilots all-around vision. The ACES-II ejection seat safely operates from 518 miles per hour down to zero speed and zero altitudes.

Avionics equipment includes communications, inertial navigation systems, computer-aided fire control and weapons delivery systems, electronic countermeasures, target penetration aids and self-protection systems. The A-10 employs both electronic and infrared countermeasures against enemy weapons systems. The weapons delivery system incorporates a heads-up display that provides the pilot with references for flight control and weapons employment. The weapons delivery systems include head-up displays that indicate airspeed, altitude and dive angle on the windscreen, a low altitude safety and targeting enhancement system (LASTE) which provides constantly computing impact point freefall ordnance delivery; and Pave Penny laser-tracking pods under the fuselage.

The A-10/OA-10 have excellent maneuverability at low air speeds and altitude, and are highly accurate weapons-delivery platforms. The A-10 has half the turning radius of the Air Force's other primary CAS aircraft, the F-16. After initially leaving a target, the A-10 can turn around and hit the same target again, all in around 7 seconds. Due to its large combat radius, the Thunderbolt II can loiter for extended periods of time, allowing for the coordination required to employ within yards of friendly forces. They can operate under 1,000-foot ceilings (300 meters) with 1.5-mile (2.4 kilometers) visibility. Using night vision goggles, A-10/ OA-10 pilots can conduct their missions during darkness. The A-10s highly accurate weapons delivery system makes it effective against all ground targets including tanks and other armored vehicles.

The aircraft is capable of worldwide deployment and operation from austere bases with minimal support equipment. Their short takeoff and landing capability permit operations in and out of locations near front lines. In addition to its survivability, the A-10 has the ability to land on unimproved airfields and be flown and maintained near Army ground troops. Highly effective and efficient in combat, the A-10 is capable of sustaining operations on unimproved airfields near ground troops -- keys to success in conducting small operations against hostile forces. The A-10's rapid re-fueling and re-arming capability allows it to operate from forward bases close to the front lines. It is also capable of refueling in the air.



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