AD 99-02-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | 328 Support Services GmbH | 328-100 | Airworthiness Directives; DORNIER LUFTFAHRT GMBH Model 328-100 Series Airplanes |
Unsafe Condition
Internal leakage of hydraulic fluid within the hydraulic components of the ground spoiler system and buildup of pressure in the return line of the bypass valve could cause the ground spoilers to unlock and deploy during takeoff or in flight, leading to reduced controllability of the airplane.
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Required Actions
Perform repetitive tests to detect hydraulic fluid leakage and pressure buildup in the ground spoiler system components, install additional hydraulic lines and a shutoff valve per SB-328-29-237, replace the valve block with a new part, and eventually replace relief restrictor valves with redesigned parts to terminate repetitive tests.
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Compliance Time
Prior to the accumulation of 3,000 total flight hours, or within 300 flight hours after the effective date of this AD (02/25/1999), whichever occurs later. For airplanes with serial numbers up to 3086, install additional components within 12 months after the effective date.
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Affected Aircraft
DORNIER LUFTFAHRT GMBH Model 328-100 series airplanes equipped with active ground spoiler option 040-001, as listed in specified service bulletins SB-328-29-220, SB-328-29-237, SB-328-27-243, and SB-328-27-228.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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