AD 76-13-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; Fairchild Model F-27 and FH-227 Airplanes |
Unsafe Condition
Looseness, gaps under bolt heads, broken bolts, or bolt rotation in engine mount attachment bolts AN4, AN5, AN6 and their nuts could lead to engine separation.
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Required Actions
Inspect all engine mount attachment bolts for gaps, looseness, broken bolts, or rotation; torque bolts to check tightness; check gaps with a .0015 feeler gauge. Replace AN bolts and nuts with NAS equivalents or unused AN parts if issues are found. Replace all AN bolts with NAS bolts and MS nuts within specified intervals.
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Compliance Time
Within the next 25 hours in service or four days for F-27J, F-27M, FH-227; within next 300 hours or 90 days for F-27, F-27A, F-27B, F-27F. Repeat inspections at intervals not exceeding 150 hours/600 hours or days as specified. Bolt replacement must occur within 900 hours/1 year or 1800 hours/2 years, whichever comes first.
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Affected Aircraft
Fairchild Model F-27 (all submodels: F-27, F-27A, F-27B, F-27F, F-27J, F-27M) and FH-227 (all submodels: FH-227, FH-227B, FH-227C, FH-227D, FH-227E) airplanes with 7500 hours in service on upper engine mount attachment bolts AN4, AN5, AN6 and their nuts.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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