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In page Vickers VC10:

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Conversion of K2, K3 and K4 tankers took place at British Aerospace's Filton site. The K3s had a forward freight door, facilitating the insertion of five upper fuselage tanks in the main fuselage; the K2s lacked forward freight doors, thus a section of the upper fuselage was dismantled to insert the five upper tanks. In the K2 and K3 conversions, extensive floor reinforcement was installed to support the additional weight imposed by the five fuel tanks.