AD 2021-09-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab | AB | Airworthiness Directives; Saab AB, Support and Services (Formerly Known as Saab AB, Saab Aeronautics) Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Saab AB, Support and Services (Formerly Known as Saab AB, Saab Aeronautics) Airplanes |
Unsafe Condition
abnormal behavior of the MLG hydraulic transfer valve due to a restriction in hydraulic flow, which could cause the MLG hydraulic transfer valve to not function properly and fail to retract, extend, or lock the MLG, and possibly result in MLG collapse following landing and consequent damage to the airplane and injury to occupants.
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Required Actions
modifying the MLG hydraulic transfer valve, as specified in EASA AD 2020-0223, which includes installing a new relay, relocation of wiring, and installation of new wiring, to ensure that, when the emergency extension handle is used, the transfer valve solenoid is energized to force the transfer valve to the ``gear down'' position.
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Compliance Time
within the compliance times specified, unless already done
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Affected Aircraft
all Saab AB, Support and Services Model SAAB 2000 airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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