C-GTAT, a De Havilland DHC-8-300 aircraft operated by Jazz Aviation LP, was conducting flight JZA8734 from Montreal/Pierre Elliott Trudeau Intl (CYUL), QC to Iles-de-la-Madeleine (CYGR),
QC. When the crew extended the gear for landing, they initially received the 3 green indication, but then the nose gear started to retract and cycle. The crew executed a missed approach and
performed an alternate gear extension. The crew did not declare an emergency but requested ARFF to be on standby. The aircraft landed uneventfully and was towed off the runway.
Maintenance is investigating.