AD 66-28-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Models 188A and 188C Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Models 188A and 188C Series Airplanes |
Unsafe Condition
Hydraulic oil leaks in the steering housing, P/N 800905-1, may lead to cracks in the 4 1/8-12 UNS-3A screw threaded portion of the bosses, compromising structural integrity.
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Required Actions
Visually inspect the steering housing for hydraulic oil leaks. If a leak is found, inspect the screw threaded portion for cracks using dye penetrant per Lockheed Alert Service Bulletin 88/SB-576B. Replace any cracked steering housings with new or improved parts before further flight.
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Compliance Time
Compliance required as indicated in sections (a) through (c) based on inspection history and landings since last inspection.
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Affected Aircraft
Lockheed Models 188A and 188C Series Airplanes with Steering Housing, P/N 800905-1, with 4,000 or more landings.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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