Charles A. Lindbergh Letter from Hotel Marion - Page 2 (1927)

Page 2 of a handwritten letter from Charles A. Lindbergh proposing a throttle-actuated landing gear warning mechanism to Donald A. Hall Sr. — Charles A. Lindbergh Letter from Hotel Marion - Page 2 (1927) · Donald A. Hall Estate Collection

Page 2 of the historic October 2, 1927 letter from Charles A. Lindbergh to Chief Engineer Donald A. Hall Sr. In this critical technical passage, Lindbergh questions the superiority of parasol monoplanes, advocates for low-wing aircraft with folding landing gear, and conceptualizes the first throttle-actuated retractable landing gear warning system, detailing how an automatic alarm should trigger if the throttle is closed while the wheels remain retracted.