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Original Text (Annotation: EAW042328 / 875621)
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In the late 60's , A Boeing 707 landed by mistake on this runway; it is on a similar alignment to Heathrow (but a long way off) .
Directly in line with this runway is a large Gasometer , and to try to avoid a recurrence of mistaken landings , the Letters "NO" were painted in very large letters on this gasometer . When doing a GCA (Ground Controlled Approach) inbound pilots were asked if they could see the big tank with "NO" on it . I believe that a similar gasometer on the approach to Heathrow had "HR" painted on it . '