AD 2013-20-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. (MDHI) Helicopters |
Unsafe Condition
Bolt failure, which could result in loss of main rotor blade structural integrity and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Daily visual check of each bolt for failure and gap between the thrust washer and retainer. Remove and inspect any failed or cracked bolt, replacing it with an airworthy bolt. Repetitive inspection for a gap between the thrust washer and retainer every 300 hours time-in-service, with additional actions if no gap is found or if the gap exceeds 0.100 inch (2.54 mm).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for daily checks and inspections, and within 300 hours time-in-service for repetitive inspections.
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Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters with main rotor blade retention bolts, part number 900R3100001-103 or 900R3100001-105, installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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