AD Amdt-39-11484
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker | F27 Mark 050 | Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes |
Unsafe Condition
Understrength rivets used in rib-to-stringer connections of the wing skins may cause fretting of the stringer, reducing static buckling strength and potentially leading to fatigue cracking in the skin and stringers, which could result in reduced structural integrity of the wings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct repetitive detailed visual inspections of the connections between specified ribs and stringers to detect loose or missing rivets or gaps. Perform a rotating probe eddy current inspection to detect cracks in the rivet holes. Install connecting angles between the stringers and ribs. Modify the rib-stringer connection by reaming original rivet holes, performing surface probe eddy current inspections, and installing new connecting angles. Repair cracks as necessary.
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Compliance Time
Before further flight for temporary repairs if cracking is detected during visual inspection. Within specified intervals for repetitive inspections. Within a defined timeframe for the eventual modification of the rib-stringer connection.
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Affected Aircraft
Fokker Model F27 Mark 050 series airplanes with specific rib and stringer configurations as outlined in the service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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