AD 77-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; Hawker Siddeley Aviation, Ltd Model DH-114 Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Aviation, Ltd Model DH-114 Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Aviation, Ltd Model DH-114 Airplanes |
Unsafe Condition
Internal corrosion of the engine mount stay strut, part number 14 EM.337A, could lead to structural failure of the strut.
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Required Actions
Remove the stay strut and inspect using X-ray procedure per Hawker Siddeley Technical News Sheet No. E.8 or FAA-approved equivalent. Replace any strut showing internal corrosion with a new or serviceable part of the same part number free of corrosion.
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Compliance Time
within the next 50 hours time in service after the effective date of this AD
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Affected Aircraft
Hawker Siddeley Aviation, Ltd Model DH-114 airplanes (D.H.114 Heron Series 2A, 2DA, 2X) not equipped with engine mount stay struts marked Issue 2 or subsequent or marked 'DOI No. 68640'
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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