Piece A - Threshold Steady Burners Crossbar

Piece A — Threshold + Steady Burners + 1,000 ft Crossbar A flat rectangular base plate, 155 mm long × 50 mm wide × 3 mm thick, representing a runway approach surface. On top of the base plate, build these features: Threshold bar (at the 0 mm end): A row of 18 small cylindrical light housings, each 4 mm diameter × 12 mm tall, spaced 3 mm apart center-to-center, running across the width of the plate perpendicular to its length. Centerline steady-burning barrettes: 5 rectangular bar housings, each 15 mm long × 8 mm wide × 14 mm tall, with 5 small circular indentations (2 mm diameter) along the top face representing light sockets. Place them on the centerline of the plate at positions 30 mm, 60 mm, 90 mm, 120 mm, and 150 mm from the threshold end. Crossbar at 1,000 ft position (150 mm mark): 2 additional bar housings (same 15 × 8 × 14 mm size) offset 21 mm left and 21 mm right of centerline, forming a T-shape with the centerline bar at that position. Click connector (at the 155 mm end): A rectangular tongue/tab, 12 mm wide × 4 mm thick × 15 mm tall, centered on the plate, extending 8 mm beyond the plate edge. This is the male connector. All features are solid, no internal cavities. Wall thickness minimum 1.2 mm.

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