VTG APR E6-B9 Universal Flight Computer Pilot Navigation Tool Silver Classic VTG APR Universal E6-B9 Flight Computer Pilot Navigation Tool Silver Excellent. This vintage aviation slide rule is a must-have for any pilot or flight student looking for a reliable, non-electronic backup for navigation calculations. It features a circular slide rule for time, speed, and distance, alongside a wind component grid for precise heading solutions. APR (Aero Products Research) Silver / Aluminum 9.75" x 4.75" Aluminum / Metal One Size Preowned and Preloved Aviation, Pilot Training, Flight School, Navigation, E6B, Dead Reckoning, STEM, Engineering, Aerospace, Retro Tech, Industrial Decor, Collector, Cockpit Gear, FAA Approved, Navigational Aid, Slide Rule, Vintage Tool, Silver Metal. Measurement in photos We ship Monday–Friday FREE 30-day returns. Refund covers item cost if returned in original condition. #Utility #90s