Airworthiness Directive · Amendment 39-13834 · Dornier Model 328-100 and -300 Series Airplanes
Dornier Model 328-100 and -300 Series Airplanes
Model 328-100 series airplanes, serial numbers 3005 through 3119 inclusive; and Model 328-300 series airplanes, serial numbers 3105 through 3207 inclusive, except serial numbers 3199, 3200, 3203, and 3204; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Dornier Model 328-100 and -300 series airplanes, that requires inspection of the metal oxide varistor (MOV) modules and transient absorption zener (TAZ) diodes to determine if those parts are outside of tolerance limits, and replacement of MOV modules and TAZ diodes with new parts, if necessary. This action is necessary to prevent the failure of critical ice protection systems following a lightning strike, which could result in reduced controllability and degraded performance of the airplane in the event of an encounter with icing conditions. This action is intended to address the identified unsafe condition.
To prevent the failure of critical ice protection systems following a lightning strike, which could result in reduced controllability and degraded performance of the airplane in the event of an encounter with icing conditions, accomplish the following:
(a) Within 90 days after the effective date of this AD, inspect transient absorption zener (TAZ) diodes and metal oxide varistor (MOV) modules to determine if those parts are outside of tolerance limits, in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-30-417, dated January 24, 2002 (for Model 328-100 series airplanes); or SB-328J-30-150, dated January 24, 2002 (for Model 328-300 series airplanes); as applicable. If any TAZ diode or MOV module is found to be outside of tolerance, before further flight, replace the faulty part with a new part in accordance with the Accomplishment Instructions of the applicable service bulletin.
(b) Although the service bulletins referenced in this AD specify to submit certain information to the manufacturer, this AD does not include such a requirement.
(c) In accordance with 14 CFR 39.19, the Manager, International Branch, ANM-114, FAA, Transport Airplane Directorate, is authorized to approve alternative methods of compliance for this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
