| AD Number | 66-20-03 | Status | Active |
| Effective Date | August 13, 1966 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-274 |
| Product Type | ["Aircraft"] | Product Subtype | ["Small/Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | Federal Register: August 13, 1966 | ||
| Manufacturer(s) | de Havilland Aircraft Co., Ltd., The |
| Model(s) | D.H.114 Heron Series 2A D.H.114 Heron Series 2DA D.H.114 Heron Series 2X |
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.