AD 73-17-03
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 Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Model DH-114 Heron Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Model DH-114 Heron Airplanes |
Unsafe Condition
Failure of the lower flap hinge-to-wing attachment bolts at Rib No. 7, the fork joint fitting (P/N 14 WF.1) and the eye joint fitting (P/N 14 WF.3) at Rib No. 2, and the angle brackets at Rib No. 01.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the lower two flap hinge-to-wing attachment bolts and nuts at Rib No. 7 with specified parts per Heron 1303. Visually inspect attachment flanges for cracks using 10-power magnification per Technical News Sheet W.16, Section 4, and replace cracked parts per RD.14WF.109. Inspect corner radius of angle brackets at Rib No. 01 for cracks using 10-power magnification per Technical News Sheet W.16, Section 5, and replace cracked parts with new parts.
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Compliance Time
Within the next 500 hours' time in service after the effective date; before 13,000 hours' time in service or within the next 300 hours' time in service after the effective date, whichever occurs later; within the next 2,400 hours' time in service after the effective date and thereafter at intervals not to exceed specified hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland Aircraft Co., Ltd.'s D.H.114 Heron Series 2A, 2DA, and 2X models.
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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