Transport Canada CF-2023-72

Requires modifications of the baggage bay sidewall interior panel and heater mat, modification of the water tank heater installation, and functional testing to address this unsafe condition. The completion of these actions will also allow the reactivation of the left-hand baggage bay sidewall heater mat that was de-activated as a corrective action mandated by AD CF-2009-38. The AD has stemmed from occurrences of malfunctioning right-hand baggage bay sidewall heaters, that resulted in the affected sidewall heater mat and airplane interior panel sustaining heat discoloration and/or scorching. In 2009, as a preventive measure, Transport Canada mandated the deactivation of malfunctioning left-hand baggage bay heater mat part number (P/N) 3436-06-1/0 to remove the possibility of uncontrolled heating of both the baggage bay sidewall interior panel and the contents of the baggage bay by the heater mat. The malfunctioning of a sidewall heater mat could, if not corrected, lead to a fire in the baggage bay.