AD 61-09-01
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
Elevator Hydraulic Damper Housing P/N 840655-1 and 475645-1 not identified with blue anodized color may malfunction due to improper dimensions, leading to potential failure in the elevator control system.
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Required Actions
Replace or rework the damper housings to specified dimensions (skirt length 0.312±0.010 in, bore 1.3800-1.3817 in, clearance 0.0015-0.0040 in), identify with blue dye or paint, and reinstall per Lockheed Service Letter FS/251702-L.
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Compliance Time
not later than the next 50 hours' time in service
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Affected Aircraft
Lockheed Model 188 Series Aircraft with Hydraulic Damper Housing P/N 840655-1 and 475645-1 installed per Service Bulletins 88/SB-524 and 88/SB-532
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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