AD 98-21-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | 328 Support Services GmbH | 328-100 | Airworthiness Directives; DORNIER LUFTFAHRT GMBH Model 328-100 Airplanes |
Unsafe Condition
Failure of the de-icing system timer and a dormant short circuit in the propeller de-icer system could cause possible overheating and debonding of the propeller blade, resulting in reduced controllability of the airplane.
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Required Actions
Replace the de-icing system timer with a new improved timer per Dornier Service Bulletin SB-328-30-164 within 8 months after the effective date. Prohibit installation of timers with part numbers A-5639-2 or 4E2947-2.
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Compliance Time
Within 8 months after the effective date of this AD
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Affected Aircraft
DORNIER LUFTFAHRT GMBH Model 328-100 airplanes, serial numbers 3005 through 3039 inclusive
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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