WestJet – Loss of Separation Issue

Daily Notification Log

Review Date: 2018-03-22

C-FWSX, a Boeing 737-700 aircraft operated by WestJet was conducting flight WJA190 from
Abbotsford, BC (CYXX) to Calgary Intl., AB (CYYC). The flight was cleared to CYYC via RNAV Y
Runway 17R. WestJet flight WJA2289, a Boeing 737-800 was operating from Los Cabos Intl.,
Mexico (MMSD) to Calgary Intl., AB (CYYC). WJA2289 was cleared to CYYC via RNAV Y Runway
17L. While both aircraft were on approach, before being established on final, aircraft separation
decreased to 2.5 miles and 1000 feet when 3.0 miles is required.

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