# AD 77-12-03: Engine Mount Stay Strut

- 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: July 18, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-2920
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FDBB0C2CC4E82629862569AB004B4BA2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-12-03

## The airworthiness directive

77-12-03 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2920. Applies to Model DH-114 airplanes, certificated in all categories, that are not equipped with engine mount stay struts marked as Issue 2 or subsequent or marked "DOI No. 68640."

Compliance is required within the next 50 hours time in service after the effective date of this AD, unless already accomplished.

To detect internal corrosion of the engine mount stay strut, P/N 14 EM.337A, accomplish the following:

  (a) Remove the stay strut from the aircraft and inspect in accordance with the X-ray procedure of Appendix I of Hawker Siddeley Technical News Sheet No. E.8, dated March 19, 1973, or an FAA-approved equivalent.

  (b) Replace any strut for which internal corrosion is detected by the inspection required by paragraph (a) of this AD with a new part or otherwise serviceable spare part of the same part number determined to be free of internal corrosion by the inspection required by paragraph (a) of this AD oran FAA-approved equivalent.

  (c) It is requested that copies of the X-rays, or results of an FAA-approved equivalent inspection, be forwarded to the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, APO New York, N.Y. 09667. (Reporting approved by the Office of Management and Budget under OMB No. 04-RO-174).

This amendment becomes effective July 18, 1977.

## 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/77-12-03/models.md
Every aircraft: https://openairdocs.org/ad/77-12-03/aircraft.md

Its text cites no advisory circulars or STCs.

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