AD 89-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Models L-188A and L-188C Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Models L-188A and L-188C Series Airplanes |
Unsafe Condition
Flap asymmetry due to spline disengagement of flap universal joints without a stop could cause airplane control difficulties.
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Required Actions
Inspect flap universal joints within 90 days to determine if they are splined without a stop. Remove affected joints and install splined joints with a stop, or modify joints by adding a snap ring or pins. Verify torque tube engagement and distances, inspect shutoff valves for hang-up or slow response, rewire the flap asymmetry annunciator light, and comply with repetitive inspections at intervals not exceeding one year.
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Compliance Time
Within 90 days after the effective date of this AD and thereafter at intervals not to exceed one year
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Affected Aircraft
Lockheed Model L-188A and L-188C series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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