AD 70-21-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; Hawker Siddeley Aviation, Limited Model DH.114 Heron Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Aviation, Limited Model DH.114 Heron Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Aviation, Limited Model DH.114 Heron Airplanes |
Unsafe Condition
Failure of the flap datum hinge assemblies due to wall thickness of the bearing housing recess less than 0.17 inches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the wall thickness of the bearing housing recess of both right and left wing flap datum hinge links. Replace the hinge link with a serviceable link of Modification 837 standard if thickness is less than 0.17 inches. Incorporate Modification 837 by replacing specific part numbers with updated assemblies as specified.
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Compliance Time
within the next 3,000 hours' time in service after the effective date of this AD, or by March 31, 1971, whichever occurs first
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Affected Aircraft
de Havilland Aircraft Co., Ltd., The Model D.H.114 Heron Series 2A, D.H.114 Heron Series 2DA, D.H.114 Heron Series 2X airplanes
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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