The Royal Small Arms Factory ADEN cannon (ADEN being an acronym for "Armament Development, Enfield")[4] is a 30 mm revolver cannon used on many military aircraft, particularly those of the British Royal Air Force and Fleet Air Arm.
[5] Developed post-World War II primarily to meet British Air Ministry's requirement for increased lethality in aircraft armament, the cannon was fired electrically and is fully automatic once it is loaded.
However, production of the MK 213 never commenced due to development problems such as excessive barrel wear, not to mention the Allied Combined Bomber Offensive campaign against German industry.
[1] The new weapon was quickly developed and production was set up at the Royal Small Arms Factory in Enfield.
5, incorporates a multitude of small changes to improve reliability and increase rate of fire to 1,500–1,700 rounds per minute.
Fleet Air Arm BAE Sea Harriers retained the 30 mm weapon until their retirement in 2006.