AD 62-27-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild Model F-27 Aircraft |
Unsafe Condition
Loss of DC power to the primary DC bus due to failure of the forward primary bus relay and loss of AC power to certain engine instruments due to failure of the 115/26V instrument transformer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install an auxiliary forward primary bus relay (Cutler Hammer P/N 6041H172) with independent control circuit including a 5-ampere circuit breaker and separate contacts in the load monitor switch (P/N MS35059-22). Install an Eclipse-Pioneer DW-73-A1 instrument transformer and selector switch (P/N MS 35059-23) to provide alternate AC power for engine instruments.
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Compliance Time
within the next 1,000 hours' time in service after the effective date of this AD
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Affected Aircraft
Fairchild Model F-27 Aircraft Serial Numbers 2 to 95 Inclusive
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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