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651 Squadron Army air Corps

651 Squadron are an Army Air Corps (AAC) squadron that operate fixed wing aircraft in manned aerial surveillance missions, including in support of UKSF.

651 Sqn is part of 5 Regiment AAC and is based at Joint Helicopter Command Flying Station, Aldergrove, Northern Ireland (formerly RAF Aldergrove). The squadron previously flew helicopters, including Lynx and Apache, before it was disbanded in 2003.

In 2006, 651 Sqn was reformed and joined the Joint Special Forces Aviation Wing (JSFAW) in order to provide support to UKSF operations in Iraq, and later, Afghanistan. It would now appear, however, that 651 Sqn is no longer in the JSFAW.

The squadron flies Britten Norman Defender 4S AL1, and AL2 turboprop aircraft and older Britten Norman Islander AL1 aircraft. It also operates the Defender T3 trainer.

651 Squadron Role

When in the JSFAW, 651 Sqn provided ISTAR (Intelligence, Surveillance, Target Acquisition, and Reconnaissance)  support to UKSF operations in both Iraq and Afghanistan. As reported in the press, based out of Basra and Al Amara, Iraq, 651 Sqn's Defenders monitored movements of insurgents along routes into the capital. It's likely that such operations involved close coordination with UKSF ground units. It's also likely that 651 Sqn supported SAS Task Force Black which operated throughout Iraq.

651 Squadron may also provide ISTAR support for domestic security operations. For instance, 651 Sqn Defenders flew patrols over London during the 2012 Olympic Games.

Britten Norman Defender 4S AL Mk2

The squadron initially flew AL1 Defenders, which were brought in as an urgent operation requirement (UOR) for use in Iraq. A number of Mk1 aircraft were were upgraded to Mk2 standard in 2008.

The Defender is a twin-engine, fixed wing turboprop aircraft that can be fitted with an array of sophisticated surveillance equipment such as:

  • low light level television (llltv) or infrared camera fitted in a turret mounted under the Defender's nose
  • door-mounted and floor-mounted cameras
  • radars and cameras can be mounted on wing hardpoints
  • COMINT (COMmunications INTelligence) gear for listening in on radio signals

When flying over hostile territory, the Defender may carry infrared jammers and other defensive systems in pods under the wings in order to defend against surface-to-air missiles.

The Defender is powered by 2 Rolls-Royce 250-17F/1 turboprops.

Defender 4S Performance

  • 3,500lbs of surveillance equipment
  • 8 hours endurance
  • can patrol up to 150nm of border per flying hour
  • day/night all-weather operation
  • can operate at low-level and up to 25,000ft
  • loiter/patrol speed 60-160kts
  • can operate on short, rough airstrips
Defender Mk2
Defender Mk2 - note the 360° sensor turret under the aircraft's nose. This can hold infrared, electro-optical and full colour video cameras. Imagery, including full motion video from the Defender's sensors can be relayed between troops and command elements, greatly enhancing their situational awareness. With its communications and sensors fitments, the Defender can be used an airborne command post.
Image by Flickr user Jerry Gunner | used with thanks under Creative Commons Attribution 2.0 Generic

Photos of 651 Sqn AAC Defender 4S AL Mk2s:
(courtesy of - used with thanks)

Britten Norman Islander AL1

In service with the AAC since 1989, the Islander is a twin-engined turboprop fixed wing manned surveillance platform. It replaced the prevously-used Beaver platform and was used extensively in Northern Ireland. They were flown by No. 1 Flight, AAC out of RAF Aldergrove. 1 Flight eventually merged with 651 Squadron, adding the Islanders to the squadron's inventory.

AAC Islander
An Army Air Corps Island AL1. The Islander is kitted out with sophisticated surveillance and communications gear, although not to the Defender's standard. The aircraft was used for photo reconnaissance over Northern Ireland during Operation Banner, for the Reconnaissance, Intelligence and Geographic Centre (RIGC). The Islander features a Instrument Flying Procedural and Navigation fit.
Image by Airwolfhound | used with thanks under Creative Commons Attribution 2.0 Generic

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