AD 75-16-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; de Havilland Model DH-114 Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; de Havilland Model DH-114 Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; de Havilland Model DH-114 Airplanes |
Unsafe Condition
Excessive wear of the counterweight bushings and subsequent ineffectiveness of the counterweight function.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and replace, if required, crankshaft counterweight pins and bushings in accordance with Teledyne Continental Overhaul Manual X-30039 or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 200 hours' time in service after the effective date of this AD, unless already accomplished within the last 1500 hours' time in service, and thereafter at intervals not to exceed 1500 hours' time in service from the last inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland Aircraft Co., Ltd., Model D.H.114 Heron Series 2A, D.H.114 Heron Series 2DA, D.H.114 Heron Series 2X airplanes modified in accordance with Supplemental Type Certificate (STC) SA1685WE
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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