# AD 77-15-13: Main Landing Gear Damper Ram

- 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 24, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-2983
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04E30C3F9CE27F0F862569AB004B8663.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-15-13

## The airworthiness directive

77-15-13 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2983. Applies to Model DH-114 airplanes certificated in all categories.

Compliance is required within the next 300 hours time in service after the effective date of this AD, unless already accomplished.

To prevent the possible seizure of the main landing gear damper ram, and consequent damage to the aircraft upon landing, accomplish the following:

  (a) Modify the damper ram, P/N AC11164, in accordance with Part A of the section entitled "Accomplishment Instructions" of Dunlop Aviation Division Service Bulletin 32-824, dated April 5, 1973, or an FAA-approved equivalent.

  (b) Upon completion of the modification specified in paragraph (a) of this AD, reidentify the modified damper ram as P/N AC65528, Mod. 1. (Hawker Siddeley Aviation, Ltd., Series: Heron (114), TNS. U.15, Issue 2, dated April 30, 1973, refers to this same subject.)

This amendment becomes effective August 24, 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/77-15-13/models.md
Every aircraft: https://openairdocs.org/ad/77-15-13/aircraft.md

Its text cites no advisory circulars or STCs.

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