# AD 66-20-03: Engine Fire Extinguishing System

- Type: Airworthiness directive
- Status: Current
- Products: de Havilland Aircraft Co., Ltd., The D.H.114 Heron Series 2A, D.H.114 Heron Series 2DA and D.H.114 Heron Series 2X
- Effective: August 13, 1966
- Published: August 13, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-274
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4CE48ACBAC671055862569A8006FA4D2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/66-20-03

## The airworthiness directive

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.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-816](https://openairdocs.org/tcds/A-816): Acro Aeronautical Services Ltd; names 3 of 3 models: D.H.114 Heron Series 2DA, D.H.114 Heron Series 2A, D.H.114 Heron Series 2X

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 1 (1 by airframe model, 0 by engine model)
- Makers: Dehavilland 1

Models with the most aircraft:

- [Dehavilland DH 114 HERON 2X](https://openairdocs.org/model/dehavilland-dh-114-heron-2x): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/66-20-03/models.md
Every aircraft: https://openairdocs.org/ad/66-20-03/aircraft.md

Its text cites no advisory circulars or STCs.

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