AD 73-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; Fairchild Model F-27 and FH-227 Aircraft |
Unsafe Condition
Cracks in the vertical stabilizer attachment fitting assemblies (P/N's 27-233000-11, -12, -31, -32, -41, and -42) due to corrosion and fatigue after accumulating 2500 hours or more in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect lugs of fittings for cracks using ultrasonic method or equivalent; inspect flanges and inner cavity for corrosion using dye penetrant and 10-power glass or equivalent. Repeat inspections at intervals not exceeding 12 months or 2500 hours, whichever comes first. Replace or repair cracked/corroded parts per service bulletins or approved methods.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 30 days for crack inspections (unless done in last 11 months) and within 60 days for corrosion inspections (unless done in last 10 months).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild Model F-27 and FH-227 aircraft with vertical stabilizer attachment fitting assemblies P/N's 27-233000-11, -12, -31, -32, -41, and -42 that have accumulated 2500 hours or more in service.
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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