AD 66-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2A | Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2DA | Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H.114 Heron Series 2X | Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes |
Unsafe Condition
The absence of 0.25 inch diameter radial holes in the engine air intake fire extinguishing system nozzle assembly (P/N P.117) could prevent proper fire extinguishing agent distribution, increasing fire risk.
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Required Actions
Inspect the engine air intake fire extinguishing system nozzle assembly to verify presence of 0.25 inch diameter radial holes in nozzle jet P/N P.117. Replace nozzle jets without the required holes with P/N P.117 jets having 0.25 inch diameter radial holes.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD
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Affected Aircraft
de Havilland Aircraft Co., Ltd., Model D.H.114 Heron Series 2A, 2DA, 2X, equipped with an engine fire extinguisher system
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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