AD 59-25-04
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
Insufficient clearance between the generator feeder wires and the leading edge rib at wing Station 221, resulting in abrasion of the insulation and grounding of the generator feeder wires.
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Required Actions
Inspect for evidence of abrasion using a light and mirror through fillet access doors N125 and N126 within 8 hours' time in service. Install additional spacers to achieve a minimum 0.38-inch clearance if abrasion is found. Repeat inspections every 60 hours' time in service but not exceeding 250 hours' time in service. Functionally test the generator differential protection system per Lockheed Maintenance Manual Section 24-1-0, page 201. Inspect all wiring in leading edge and power plant sections within 250 hours' time in service for abrasion or insufficient clearance, correcting issues before next flight.
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Compliance Time
within the next 250 hours' time in service
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Affected Aircraft
Lockheed Model 188 Series Aircraft - Serial Numbers 1002 Through 1072
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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