AD 70-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; Hawker Siddeley Model DH.114 Heron Series Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Model DH.114 Heron Series Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Model DH.114 Heron Series Airplanes |
Unsafe Condition
Failure of the fin to fuselage front attachment brackets at Bulkhead 6 due to cracking or distortion.
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Required Actions
Visually inspect Bulkhead 6 for cracking or distortion every 1200 hours' time in service. Inspect forward fin attachment fittings (specific part numbers) every 300 or 1200 hours' time in service depending on modification status. Replace fittings if cracks are found, and inspect related components. Use specified technical news sheets or approved equivalents.
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Compliance Time
Within the next 1200 hours' time in service from the effective date, and thereafter at intervals not to exceed 1200 hours' time in service since the last inspection (for Bulkhead 6). For fittings, within the next 300 hours' time in service after the effective date, and thereafter at intervals not to exceed 300 or 1200 hours' time in service as specified.
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Affected Aircraft
de Havilland Aircraft Co., Ltd.'s D.H.114 Heron Series 2A, 2DA, 2X airplanes with specific fin attachment fittings (part numbers 14FS.1891, 14FS.1892, 14FS.5007, 14FS.5008, 14FS.4669, 14FS.4670) installed on Bulkhead 6.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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