A Skywest Canadair CRJ-200 on behalf of United, registration N908EV performing flight UA-5493 from San Francisco,CA (USA) to Calgary,AB (Canada) with 29 passengers and 3 crew, was on approach to Calgary when the crew selected Flaps 8 and received a "FLAPS FAIL" indication. The crew discontinued the approach, worked the related checklist and prepared for a flaps up landing on runway 35R at a higher than normal speed.
The aircraft remained on the ground for about 8 hours, then departed for the return flight.