80-12-15
final ruleAirworthiness Directives; ROSEMOUNT, INC. All Model 856 AE-12, -13, and -15 Pitot-Static Probes up to and including S/N 49529
Unsafe Condition: Icing of the Pitot-Static Probe heater element due to resistance values less than minimum limits, leading to potential inoperative heater and unsafe flight conditions.
Why matched: Airworthiness Directives; ROSEMOUNT, INC. All Model 856 AE-12, -13, and -15 Pitot-Static Probes up to and including S/N 49529