Lockheed TR-1

Lockheed TR-1
Name	TR-1
Type	High-altitude reconnaissance aircraft
Manufacturer	Lockheed Corporation
Designer	Clarence "Kelly" Johnson
First flight	1 August 1981
Introduced	1981
Retired	1990s
Primary user	United States Air Force
Number built	35
Developed from	Lockheed U-2

Lockheed TR-1. The Lockheed TR-1 was a high-altitude tactical reconnaissance aircraft developed from the iconic Lockheed U-2 for the United States Air Force. Designed to perform stand-off surveillance for NATO forces in Europe during the Cold War, it was equipped with advanced Synthetic-aperture radar and electronic sensors. The TR-1 provided critical intelligence without crossing hostile borders, serving as a key asset until its retirement in the 1990s.

Development and design

The TR-1 program emerged from a United States Air Force requirement in the late 1970s for an improved tactical reconnaissance platform based on the existing Lockheed U-2R airframe. Under the direction of legendary designer Clarence "Kelly" Johnson at the Lockheed Skunk Works, the aircraft was reconfigured to carry the massive Advanced Synthetic Aperture Radar System (ASARS-1) in a distinctive enlarged Q-bay nose compartment. This Raytheon-developed sensor could map ground details from extreme ranges, complementing other payloads like the Precision Emitter Location Strike System (PELSS) for Signals intelligence. The airframe incorporated structural enhancements and more powerful Pratt & Whitney J75 engines to handle increased weight from its sophisticated Electronic warfare suites, which were integrated under programs like Senior Ruby and Senior Spear.

Operational history

Entering service with the United States Air Force in 1981, the TR-1 was primarily operated by the 9th Reconnaissance Wing at Beale Air Force Base in California, with forward deployments to RAF Alconbury in the United Kingdom and other bases across Europe. During the Cold War, its missions along the Iron Curtain provided NATO commanders with vital imagery and electronic order of battle data on Warsaw Pact forces, notably during major exercises like Able Archer 83. The aircraft saw extensive use during the Gulf War, where its sensors contributed to the Battle of Khafji and the Coalition of the Gulf War's overall situational awareness. Following the dissolution of the Soviet Union, remaining airframes were redesignated as the U-2S after upgrades, with the last TR-1 missions flown in support of Operation Provide Comfort over Iraq.

Specifications (TR-1A)

* **Crew:** 1 * **Length:** 63 ft (19.2 m) * **Wingspan:** 103 ft (31.4 m) * **Height:** 16 ft (4.88 m) * **Empty weight:** 16,000 lb (7,257 kg) * **Max takeoff weight:** 40,000 lb (18,144 kg) * **Powerplant:** 1 × Pratt & Whitney J75-P-13B turbojet, 17,000 lbf (76 kN) thrust * **Maximum speed:** 430 kn (495 mph, 797 km/h) * **Service ceiling:** 90,000 ft (27,430 m) * **Range:** 3,000 nmi (3,450 mi, 5,550 km) * **Sensors:** Advanced Synthetic Aperture Radar System (ASARS-1), Precision Emitter Location Strike System (PELSS)

Variants

* **TR-1A:** The standard single-seat tactical reconnaissance model, with thirty-one aircraft built. * **TR-1B:** A two-seat trainer variant converted from existing Lockheed U-2 airframes, with two examples used for pilot instruction at Beale Air Force Base. * **ER-2:** Designation for two aircraft operated by the National Aeronautics and Space Administration (NASA) for high-altitude civilian Earth science research, including missions for the Airborne Science Program. * **U-2R:** The direct progenitor airframe, with the TR-1 considered a production block of this model focused on tactical reconnaissance.

Operators

The sole military operator was the United States Air Force. Primary units included the 9th Reconnaissance Wing and its subordinate squadrons, such as the 5th Reconnaissance Squadron and the 99th Reconnaissance Squadron, which were stationed at Beale Air Force Base. Deployed detachments operated from locations including RAF Alconbury, Osan Air Base in South Korea, and Akrotiri in Cyprus. The civilian National Aeronautics and Space Administration operated the related ER-2 from the Armstrong Flight Research Center (formerly Dryden Flight Research Center) in California.

Aircraft on display

* **TR-1A, serial number 80-1067:** On display at the National Museum of the United States Air Force at Wright-Patterson Air Force Base in Ohio. * **TR-1A, serial number 80-1074:** Preserved at the Pima Air & Space Museum in Tucson, Arizona, adjacent to Davis-Monthan Air Force Base. * **ER-2, serial number 80-1097:** One of the National Aeronautics and Space Administration aircraft, displayed at the Armstrong Flight Research Center in California.

Category:United States reconnaissance aircraft 1980–1989 Category:Lockheed aircraft Category:High-altitude and long endurance aircraft