DHC-6
From Yahoo News:
"Capt. Ihab Moheildin, the air control officer at Cairo airport, said the Canadian-made DeHavilland DHC-6 Twin Otter plane took off in sunny, clear weather at 7:46 a.m. local time from El Gorah base — the northern headquarters of the peacekeeping mission — on its way to St. Catherine's airport in the southern Sinai Peninsula.
He said the airport lost contact with the plane at 9:15 a.m. after receiving a distress signal, indicating a possible mechanical failure. The plane then crashed into a mountain, according to Moheildin."