Mayday - Season 4 - Eps 5: Hidden Danger (United Airlines 585, USAir 427 and Eastwind Airlines 517)
On 3 March 1991, a Boeing 737 operating as United Airlines Flight 585 is on approach to land, when it suddenly rolls into a dive and crashes within eight seconds, killing all 25 people on board. On 8 September 1994, USAir Flight 427 is another Boeing 737 on approach to land, when it rolls and crashes within thirty seconds, killing all 132 people on board. On 9 June 1996, Eastwind Airlines Flight 517 is another Boeing 737 that unexpectedly rolls in similar circumstances, but the crew successfully regains control of the aircraft and lands safely. The cause of all three incidents was the rudder experiencing a "hardover" (suddenly going to full deflection) and jamming due to thermal shock of the hydraulic control valve.
About Mayday

Title: Mayday
First Air Date: 2003-09-03
Last Air Date: 2025-03-23
Status: Returning Series
Rating: 8.2/10 (from 260 votes)
Language: EN
Seasons: 26
Total Episodes: 229
Network: 5 Discovery Sky History National Geographic Channel National Geographic
Genres: Documentary, Drama, Crime
Production Companies: Cineflix Productions, World Media Rights
Synopsis
Major real-life air disasters are depicted in this series. Each episode features a detailed dramatized reconstruction of the incident based on cockpit voice recorders and air traffic control transcripts, as well as eyewitnesses recounts and interviews with aviation experts.
Cast

Stephen Bogaert
Narrator (voice)

Jonathan Aris
Narrator (Nat Geo)