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Original Text (Annotation: EAW011997 / 647193)
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                            Southall Gasometer :
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Infamous landmark for pilots approaching Heathrow airport, when having had to use the now de-activated 05/23 [crossed] runway, more usual in poorer weather conditions. 
So as not to be confused with the similar approach to nearby RAF Northolt, also having a gasometer on its approach : Each was marked with bold lettering, to aid the pilots, to distinguish for their arrival, at their correct destination.
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