1 - The Black Vault

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DA0/ 1/13
4 Jul OJ
DAS 4Al(Sec)
3. Against this background, the answers questions are as follows:
a. Since I Jan 01, fifteen aircraft remained unidentified as they were detected
approaching UK airspace by the air defence system.
b. Subsequently, nine ofthe aircraft were positively identified.
c. None were found to be unauthmised incursions by aircraft of a potentially
hostile foreign power. However, it should be noted that there are occasional, prenotified
and authorised movements of civil and military aircraft from potentially hostile
nations into UK airspace.
d. Of the six tracks that remained unidentified, two never actually entered UK
airspace and the remaining four were assumed friendly ba~ed on behavioural patterns.
4. I hope you find this data of use. As is always the case, there is an inherent danger in
providing too much detail to those who do not fully understand our systems and procedures.
The detail can easily lead to miscomprehension and an inevitable round of additional
questi ons. With that in mind, I leave it to your judgement as to whether you should use the
above facts in your response to
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