AD 97-04-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker Services | F27 Mark 050 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 100 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 200 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 300 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 400 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 600 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 700 | Airworthiness Directives; Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 Series Airplanes |
Unsafe Condition
Fatigue cracking from an improperly machined radius of the inner tube in certain tubes installed in the drag stay units (DSU) of the main landing gear (MLG), which could result in reduced structural integrity or collapse of the MLG.
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Required Actions
Perform an ultrasonic inspection within 60 days after the effective date to determine if specific tubes are installed. If certain tubes are found, reidentify or replace them prior to further flight. Follow-up actions include additional inspections or rework depending on inspection results, with intervals not exceeding 1,500 flight cycles and deadlines up to 12,000 flight cycles after the effective date.
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Compliance Time
Within 60 days after the effective date of this AD, and prior to further flight as specified for certain actions.
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Affected Aircraft
Fokker Model F27 Mark 050, 100, 200, 300, 400, 600, and 700 series airplanes equipped with Dowty Aerospace MLG DSU part numbers 200684001, 200261001, or 200485001.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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