AD 59-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Model 188 Series Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Model 188 Series Aircraft |
Unsafe Condition
Repeated loosening of wing leading edge attachment screws between the fuselage and the outboard nacelles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the leading edge attachment screws every 50 hours of service time and tighten any loose screws. Retighten all screws every 300-hour interval to 25 to 40 inch-pounds torque. Replace NAS 517-3 screws with LPHT 517-3 screws and torque to 45-55 inch-pounds if removed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
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Affected Aircraft
Lockheed Model 188 Series Aircraft (188A, 188C)
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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