AD 65-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Models 188A and 188C Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Models 188A and 188C Aircraft |
Unsafe Condition
Cracks occurring at the lower No. 4 wing plank drain hole adjacent to Wing Station 159.6.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually or by FAA-approved methods, inspect the areas around both left and right lower No. 4 wing plank drain holes near Wing Station 159.6 for cracks radiating from the holes. Do not remove 1/4-inch rivets plugging the holes on wet bay aircraft. If cracks are found, perform permanent repairs per Lockheed Service Bulletin 88/SB-587A revised by 88/SB-587B or approved equivalent, or obtain FAA-approved repairs depending on crack length. Enlarge drain holes and conduct dye penetrant inspections at specified intervals if cracks are under 0.32 inch.
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Compliance Time
Compliance required as indicated in the AD: For aircraft with ≥5,000 hours' time in service as of 12/9/1965, comply within next 150 hours' time in service (unless done within prior 850 hours). For aircraft with <5,000 hours, comply before reaching 5,150 hours (unless done between 4,150-5,150 hours). Thereafter, inspections every ≤1,000 hours' time in service. Adjustments may be requested per (f).
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Affected Aircraft
Lockheed Models 188A and 188C Aircraft.
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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