AD 67-23-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227D | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227E | Airworthiness Directives; Fairchild-Hiller Model F-27J Airplanes and FH-227 Series Airplanes |
Unsafe Condition
Electrical damage to the A.C. engine-driven generator resulting from an unregulated and unloaded condition when the APU-driven generator (A.C.) is switched on the line.
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Required Actions
Rewire the engine-driven A.C. generator control sensing circuit in accordance with specified service bulletins or an equivalent modification approved by the FAA. An increase in compliance time may be approved upon request with substantiating data.
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Compliance Time
within the next 400 hours' time in service after the effective date of this AD
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Affected Aircraft
Fairchild-Hiller Model F-27J Airplanes, Serial Numbers 111 and 113 through 121, and FH-227 Series Airplanes, Serial Numbers 501 through 520, incorporating Solar Auxiliary Power Unit, Model T62T25.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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