Air Canada 624
Printed page 59. PDF page 67.
During this time, the airport operations' radio repeaters, which were interconnected by a network switch, and the landline telephone system did not function. Although the repeaters were wired to uninterruptible power supplies to provide a backup source of electrical powerOpen official document at PDF page 67Aviation Investigation Report A15H0002: Collision with terrain, Air Canada, Airbus Industrie A320-211, C-FTJP, 29 March 2015