From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Patent document concerning a throttle-actuated warning system for an aircraft's undercarriage.
| Identifier | ExFiles\Box 147\4\ scan0118 | |
| Date | 10th October 1940 guessed | |
| No. 526,004 Patentee. Blackburn Aircraft Ltd and H.E.Hill. Title. Aircraft. The closing of the throttle actuates a warning note to direct pilot's attention to the necessity of lowering the under carriage. ------------- | ||