AD 69-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; Fairchild-Hiller Models F-27 and FH-227 Aircraft |
Unsafe Condition
A single shorted cartridge unit could render the engine fire extinguisher system inoperative.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the engine fire extinguisher systems in accordance with Fairchild Hiller Service Bulletins F27-26-5 or FH227-26-3 (dated May 16, 1968) or later FAA-approved revision, or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 500 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild-Hiller Models F-27 (including F-27A, F-27B, F-27F, F-27G, F-27J, F-27M) and FH-227 (including FH-227B, FH-227C, FH-227D, FH-227E) aircraft.
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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