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Forget.
XH557 was the trials a/c used for the first fit of Olympus 301. First one 301, then two (port), then all four.
XJ784 was the next a/c followed by XL391.
XL384-390 were returned from service and modified to accept Olympus 301.
From the production line the remaining Vulcans, XM574-576, 594-595, 597-612, 645-657 were fitted with 301s.
Ciarain.
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