Incident at Charlottetown


2000-02-16: C-FMQO C172 reported severe aileron problem while downwind for runway 28 in Charlottetown. Aircraft landed safely. TSB case close more to follow : Update: The pilot reported that control yoke input to the left was very difficult and occasionally a "snap" would emit from overhead in the cockpit. Simultaneous to the "snap" sound the aircraft would tend to roll to the right. Maintenance completely inspected the Aileron system and no problems were evident. Upon further investigation it was determined that the wing levelling system was switched to the "On" position and the right/left bank knob was adjusted to a right bank. The system was tested as set in the hangar. When the yoke was moved to the left it took considerable force and a "snap" sound could be heard as the manual input was overriding the Roll Servo. The operator suspects the pilot inadvertently and unknowingly activated the wing level system while carrying out the pre-landing checks. TSB file # A00A0011 Update: Private Pilot building experience toward the CPL, so no flight training concerns. Since there is potential for this to happen to a trainee (inadvertent activation of the autopilot in flight) the CFI was asked to address the issue. This FTU presently offers instruction on how to use the autopilot as part of their PPL training syllabus. It seems this pilot did not fall back on that training, so suggestions were made to change the pre-take off and pre-landing checklists to ensure the autopilot is turned off. It was suggested that the CFI look into the development of an emergency procedure checklist that would be initiated when a pilot encounters stuck ailerons, directing them to turn off all autopilot modes. CFI will check the POH and autopilot supplements for procedures and, if possible, will develop a checklist for this emergency situation.


CADORS Number 2000A0051
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2000-01-30 - 22:09
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Prince Edward Island, Canada, North America, Atlantic Region, Charlottetown
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant]

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration FMQO | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator Commercial
Make  Silhouette image of CESSNA
Model  Silhouette image of 172M
Year Built 1974
Engine Type Reciprocating
Engine Make
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number
Flight Rule
CARS Subpart
Phase of Flight Approach
Damage Unknown
Fatalities 0
Injuries 0
Events Flight control systems (ailerons, rudder, rotors, flaps, main, tail)

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