AD 60-09-03
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
Failure to observe specified operating speeds (Vno and Vne) and improper feathering of propellers when torquemeter indicators malfunction could lead to structural failure or engine damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Post placards indicating Vno=225 knots CAS/MACH 0.55 and Vne=245 knots CAS/MACH 0.55. Feather propeller if torquemeter goes to zero/full scale unless engines have midbearing torquemeter P/N 6823900 with blue stripe. Deactivate autopilot until modifications per FAA-approved Service Bulletins 88/SB-453 and 88/SB-500 are completed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
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Affected Aircraft
Lockheed Model 188A and 188C aircraft. All serial numbers unless modified per AD 60-21-01 or Service Bulletin 88/SB-500.
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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