Mystery Squadron: Chapter 5 - The Death Swoop

Taken from IMDB: Hank Davis, foreman on a huge dam project, enlists the aid of his two flyer friends when a sinister figure known as The Black Ace leads his Mystery Squadron of masked pilots in an attempt to destroy the dam. / Mystery Squadron: Chapter 1 - The Black Ace / Mystery Squadron: Chapter 2 - The Fatal Warning / Mystery Squadron: Chapter 3 - The Black Ace Strikes / Mystery Squadron: Chapter 4 - Men of Steel / Mystery Squadron: Chapter 5 - The Death Swoop / Mystery Squadron: Chapter 6 - Doomed / Mystery Squadron: Chapter 7 - Enemy Signals / Mystery Squadron: Chapter 8 - The Canyon of Calamity / Mystery Squadron: Chapter 9 - The Secret of the Mine / Mystery Squadron: Chapter 10 - Clipped Wings / Mystery Squadron: Chapter 11 - The Beast at Bay / Mystery Squadron: Chapter 12 - The Ace of Aces