AD 62-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27A | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27B | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27F | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27G | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27J | FAIRCHILD Model F-27 Series Aircraft |
| aircraft | Maryland Air Industries, Inc. | F-27M | FAIRCHILD Model F-27 Series Aircraft |
Unsafe Condition
Failure of main landing gear drag strut attaching bolts, specifically cracks emanating from the center grease hole and progressing around the bolt circumference.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect bolts (Dowty P/N 9017Y11 and 9027Y7) for cracks using magnetic particle or dye penetrant methods. Replace cracked bolts prior to further flight with specified substitutes or original type. Drill a 0.141-inch hole for cotter pins in NAS bolts, coat with MIL-G-3278A grease, and tighten nuts snug. Daily oiling of NAS bolts with SAE 20 motor oil is required. Inspections and regreasing must occur at specified intervals (e.g., every 300 landings) depending on bolt type and bushing clearances. Replace bushings if clearance exceeds limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 landings after effective date of this AD unless already accomplished within the past 100 landings.
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Affected Aircraft
Fairchild Model F-27 Series aircraft (all serial numbers) with main landing gear drag strut attaching bolts.
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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