AD/Do 328/26 Ice and Rain Protection Systems (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Dornier 328 Series Aeroplanes

AD/DO 328/26 Ice and Rain Protection Systems 1/2006

Applicability:	Model 328-100 aeroplanes with serial numbers 3005 to 3119 inclusive.
Requirement:	1.    If not previously accomplished, 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 24 January 2002.
2.    If any TAZ diode or MOV module is found to be outside of tolerance, replace the faulty part with a new part in accordance with the Accomplishment Instructions of the service bulletin.
Note:  LBA AD 2002-262 refers.
Compliance:	For Requirement1 - Within 30 days after the effective date of this Directive.
For Requirement1 - Before further flight after the Requirement 1 inspection.
This Airworthiness Directive becomes effective on 19 January 2006.
Background:	The German Luftfahrt-Bundesamt (LBA) has received advice from the aircraft manufacturer that a Revision of the Aircraft Maintenance Manual will provide procedures for the inspection of the TAZ diodes and MOV modules following a lightning strike.  This Directive requires an initial inspection of all installed units to detect faulty units affected by earlier lightning strikes.

James Coyne
Delegate of the Civil Aviation Safety Authority

30 November 2005