B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Vehicle
Flight Crew Regained Aircraft Control; Flight Crew Returned To Gate; General Evacuated
Weather
After parking at the gate; we were given the signal by the ramp crew that the aircraft was chocked (triple chocked confirmed by the ramp crew). Because of the weather conditions the parking brake remained set (per SOP). The jetway was moved into position (after shoveling the tires of the bridge free) and the passengers began to disembark. After approximately 12 passengers were off; the aircraft was affected by a gust of wind that 'weather vaned' the aircraft. The deplaning door of the aircraft moved about 5-6 feet away from the jetway.After deliberation; the jetway was moved back to the aircraft. Once there; it again moved another six inches away. At this point; we decided to attach a TUG to the nose gear and requested to have the nose gear sprayed with de-icing fluid in an attempt to anchor the nose gear. These efforts worked well enough to allow the passengers to disembark.
When the B737 boarding door was repeatedly driven from the jetway during passenger deplaning by weathervaning winds on a slippery ramp the flight crew improvised an anchoring method including leaving a tug attached to the nose gear and spraying the nose gear and surrounding ramp with deicing fluid to enhance the coefficient of friction. Following these efforts the passengers were successfully deplaned.