AD 80-18-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; FAIRCHILD Model F27 and FH227 Series Airplanes |
Unsafe Condition
Cracks in the front spar web, upper and lower spar caps, skins, stringers, and rib caps on the upper and lower surface of the left and right horizontal stabilizer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the horizontal stabilizer for cracks in accordance with specified service bulletins or approved equivalents. Repair or replace cracked parts before further flight. Compliance intervals vary by model: F27A/F27F/F27G require initial inspection within 50 hours and subsequent every 300 hours (extendable to 1200 hours after SB F27-55-7). F27J/F27M require initial within 50 hours and every 60 hours (extendable to 150 or 350 hours after SBs F27-55-7 and F27-55-11/12). FH227 types must comply within 150 hours and every 1200 hours. Use X-ray/dye penetrant with 10-power glass or equivalent for inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD text, with specific intervals tied to service hours: e.g., initial inspections within 50/150 hours after effective date, subsequent intervals not exceeding specified hours in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Maryland Air Industries, Inc. models F27 (F27A, F27B, F27F, F27G, F27J, F27M) and FH227 series (FH227, FH227B, FH227C, FH227D, FH227E) airplanes, including F27 models with FH227 horizontal stabilizer installed.
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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