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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
Federal Register Abstract
Engine Fire Extinguishing System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_66-20-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-20-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes Subject: Engine Fire Extinguishing System Status: Current Citation: Federal Register: August 13, 1966 Citation Publish Date: 08/13/1966 Effective Date: 08/13/1966 Make: 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Heron Series 2DA | D.H.114 Heron Series 2X Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 66-20-03 CITATION: [Federal Register: August 13, 1966] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-274 AD NUMBER: 66-20-03 SUBJECT HEADING: Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes ACTION: SUMMARY: DATES: Effective August 13, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-20-03 HAWKER SIDDELEY: Amdt. 39-274 Part 39 Federal Register August 13, 1966. Applies to de Havilland Model 114 Heron Series Airplanes Equipped With an Engine Fire Extinguisher System. Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished. (a) Inspect the engine air intake fire extinguishing system nozzle assembly to determine that 0.25 inch diameter radial holes are present in nozzle jet, P/N P.117. (b) Replace each nozzle jet without 0.25 inch diameter radial holes with jet, P/N P.117, with 0.25 inch diameter radial holes. (Hawker Siddeley Aviation Limited Technical News Sheet Series Heron (114) No. M.6., Issue 1, pertains to this subject.) This directive effective August 13, 1966. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_66-20-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-20-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes Subject: Engine Fire Extinguishing System Status: Current Citation: Federal Register: August 13, 1966 Citation Publish Date: 08/13/1966 Effective Date: 08/13/1966 Make: 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 Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 66-20-03 CITATION: [Federal Register: August 13, 1966] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-274 AD NUMBER: 66-20-03 SUBJECT HEADING: Airworthiness Directives; Hawker Siddeley Model 114 Heron Series Airplanes ACTION: SUMMARY: DATES: Effective August 13, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-20-03 HAWKER SIDDELEY: Amdt. 39-274 Part 39 Federal Register August 13, 1966. Applies to de Havilland Model 114 Heron Series Airplanes Equipped With an Engine Fire Extinguisher System. Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished. (a) Inspect the engine air intake fire extinguishing system nozzle assembly to determine that 0.25 inch diameter radial holes are present in nozzle jet, P/N P.117. (b) Replace each nozzle jet without 0.25 inch diameter radial holes with jet, P/N P.117, with 0.25 inch diameter radial holes. (Hawker Siddeley Aviation Limited Technical News Sheet Series Heron (114) No. M.6., Issue 1, pertains to this subject.) This directive effective August 13, 1966. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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