AD 98-04-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R44 | Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters |
Unsafe Condition
Excessive wear on the lateral cyclic trim spring shaft can create a notch, causing the spring assembly to move out of its lower mount and interfere with lateral cyclic control, which could result in loss of control of the helicopter.
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Required Actions
Measure the shaft diameter within 10 hours time-in-service (TIS) and every 20 hours TIS thereafter using SB-26. Replace the C056-1 Rev. A-G spring assembly with a C056-1 Rev. H version if the shaft diameter varies more than 0.004 inch in any 0.50 inch of length before further flight.
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Compliance Time
Within 10 hours time-in-service (TIS), and thereafter at intervals not to exceed 20 hours TIS.
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Affected Aircraft
Robinson Helicopter Company Model R44 helicopters, serial numbers 0002 through 0420, 0425, 0426, and 0427, with a C056-1 Rev. A through G spring assembly installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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