One template per seat rail required. Models 150-152 do not require templates as the screw holes are predrilled. Model 177 Cardinal seat rails require one (1) SRTEM3 templates per rail. Seat rail series MC0511240, MC0511243, MC0514209 and MC2414002 use SRTEM2. All other rail series use SRTEM1.
McFarlane Aviation discovered while installing and developing our replacement seat rails that the seat rail attachment hole pattern was not consistent from aircraft to aircraft. Even small inconsistencies in the hole locations made installation of new seat rails very difficult. For this reason, McFarlane seat rails do not have attachment holes. This allows the installer to match the holes in his specific aircraft floor. Templates are used to achieve a precise fit of the new seat rail.
To use the templates:
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