AD 90-17-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; FOKKER Model F-27 Series Airplanes |
Unsafe Condition
Cracks in the lower or upper part of the fillet radius of the wing upper skin stringer fork-end fittings at the outboard side of the Wing Station 4155 joint could reduce structural integrity of the wing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 180 days after the effective date, perform a high frequency eddy current inspection of the fork-end fittings. If cracks are found in the lower part, blend until no crack indication remains but not exceeding 2.5 mm depth; replace coupling rods if cracks persist. Replace coupling rods if upper part cracks are found, all prior to further flight. Allow alternate compliance with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 180 days after the effective date of this AD, and prior to further flight as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Maryland Air Industries, Inc. Model F-27 series airplanes, Serial Numbers 10102 and 10105 through 10624, inclusive, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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