AD 60-26-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED All Model 188 Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED All Model 188 Aircraft |
Unsafe Condition
Failure of the clamp or flange of the swirl straightener assembly resulted in overheating the nacelle area causing extensive damage to the nacelle, and failures of the retaining clamp and cracks in the flange area caused by dynamic loads from sugar scoop deflection of exhaust gases.
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Required Actions
Remove the present sugar scoop and lower bellmouth, install a new extended lower bellmouth to mate with the engine, relocate fire sensing elements on the structural shroud, tack-weld vanes to clips on the straightener assembly perimeter, add rubbing strips on the tailpipe shroud door, and drill holes in the nacelle cooling duct assembly as per Lockheed S/B No. 430.
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Compliance Time
at the first engine change after December 14, 1960
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Affected Aircraft
Lockheed Martin Corporation 188A and 188C aircraft models
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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