AD 68-08-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild-Hiller Model F-27 Aircraft |
Unsafe Condition
Residual fuel fire in the heater outer air passage due to lack of adequate drainage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate a heater outer pass drain installation per Fairchild Service Bulletin No. 21-68 Revision No. 1 or later FAA-approved revision, or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Log heater operational hours until compliance is achieved.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 400 operational heater hours after the effective date of this AD.
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Affected Aircraft
Fairchild-Hiller Model F-27 aircraft, serial numbers 1 to 95 inclusive, incorporating a combustion heater system.
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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