AD 81-24-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes |
Unsafe Condition
A reduction in performance which could result in a hazardous condition due to improper synchronization control position during takeoffs and approaches.
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Required Actions
Incorporate a revision in the Limitations Section of the FAA-Approved Airplane Flight Manual specifying that all takeoffs and approaches must be performed with the synchronization control in the specified position: SYNC MASTER switch-OFF for Hamilton Standard Propellers and Synchronizer switch-SYNCH OFF for Aeroproducts Propellers.
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Compliance Time
within 30 days after the effective date of this AD
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Affected Aircraft
Lockheed-CALIFORNIA COMPANY Models 188A and 188C Series airplanes, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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