AD 2020-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Limited | Airworthiness Directives; Bell Helicopter Textron Canada Limited Helicopters |
| aircraft | Bell | Helicopter Textron Canada Limited | Airworthiness Directives; Bell Helicopter Textron Canada Limited Helicopters |
Unsafe Condition
precipitation in the forward portion of the roof structure that can lead to pooling at the bellcrank assembly and corrosion of the bearings, resulting in restrictions in the collective, directional or pitch control systems, and subsequent loss of helicopter control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Disconnect the forward ends of the collective control tube, longitudinal stability and control augmentation system (SCAS) actuator, and lateral SCAS actuator, and stow the collective control tube and each SCAS actuator to prevent binding; inspect for any roughness in the flight control system and any binding in any arm end bearing and on the longitudinal bellcrank assembly; replace the six pivot bearings in the collective/lateral bellcrank assembly and the longitudinal bellcrank assembly if there is any roughness in the flight control system; replace each arm end bearing before further flight if there is any binding in any arm end bearing or on the longitudinal bellcrank assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months after the helicopter was manufactured or 30 days after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 6 months.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Model 429 helicopters with a bellcrank assembly part number (P/N) 429-001-523-101, 429-001-523-103, 429-001-532-101, or 429-001-532-103 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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