# AD 79-03-05: Main Landing Gear Extension Tube Assemblies

- Type: Airworthiness directive
- Status: Current
- Products: B-N Group BN2A MK. III, BN2A MK. III-2 and BN2A MK. III-3
- Effective: February 27, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3412
- Registered aircraft: 3 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/338DC9352F7F1F8286256A34005C91DF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-03-05

## The airworthiness directive

79-03-05 BRITTEN-NORMAN (Bembridge) LTD: Amendment 39-3412. Applies to Model BN-2A Mk III Trislander series airplanes, certificated in all categories.

Compliance is required, as indicated, unless already accomplished.

To prevent structural failure of the main landing gear:

  (a) Within the next 10 hours time in service after the effective date of this AD, inspect the shock absorber mounting flange, P/N NB-40-C-075, at attachment point to the lower extremity of the main landing gear leg extension tube, P/N NB-40-D-337, for sheared or loose rivets and general structural integrity in accordance with paragraph "ACTION" of Britten- Norman Service Bulletin BN-2/SB.118 (Service Bulletin), dated July 25, 1978, or an FAA- approved equivalent.

  (b) If, during any inspection required by this AD, sheared or loose rivets or indications of movement of the mounting flange within the extension tube are found, before further flight, accomplish the appropriate rectification and modification in accordance with paragraph "Rectification/Modification" (Mod. NB/M/1007) of the Service Bulletin, or an FAA- approved equivalent.

  (c) If, during the inspection required by paragraph (a) of this AD, no sheared or loose rivets or indications of movement of the mounting flange within the extension tube are found, the airplane may be returned to service and thereafter, prior to the accumulation of 200 hours time in service after the completion of the inspection required by paragraph (a) of this AD, accomplish the rectification and modification required by paragraph (b) of this AD.

  (d) If, prior to the accomplishment of the rectification and modification required by this AD, the landing gear is abused, e.g., the aircraft experiences hard or rough landings, a blown tire, sharp turns pivoting about a braked wheel, or taxiing over rough or soft surfaces, before further flight, inspect the shock absorber mounting flange, P/N NB-40-C-075, at attachment point to the lower extremity of the main landing gear extension tube, P/N NB-40-D-337, for sheared or loose rivets and general structural integrity in accordance with paragraph "ACTION" of the Service Bulletin, or an FAA-approved equivalent.

  (e) Within the next 10 hours time in service after the effective date of this AD, fabricate and install in the cockpit near the limitation placard a temporary placard, which must remain in place until the rectification and modification required by this AD are accomplished, which states:

CAUTION 1. Avoid sharp turns pivoting about a braked wheel.

2. Avoid taxiing over rough or soft surfaces.

3. Record any abuse of the landing gear, e.g., hard or rough landings, blown tire, sharp turns pivoting about a braked wheel, taxiing over rough or soft surfaces, in the aircraft maintenance log book or other appropriate maintenance record and have inspected in accordance with AD 79-03-05 prior to next flight.

4. These limitations must be observed until the modification required by AD 79-03- 05 is incorporated.

  (f) Before installation on aircraft, incorporate Britten-Norman Mod. NB/M/1007 or an FAA-approved equivalent on main landing gear extension tube assemblies held as spares which do not already incorporate that modification.

This amendment becomes effective February 27, 1979.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A29EU](https://openairdocs.org/tcds/A29EU): Britten-Norman Aerospace Ltd.; names 3 of 3 models: BN2A MK. III, BN2A MK. III-2, BN2A MK. III-3

## 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: 3 (3 by airframe model, 0 by engine model)
- Makers: Britten Norman 3

Models with the most aircraft:

- [Britten Norman BN-2A MK III](https://openairdocs.org/model/britten-norman-bn-2a-mk-iii): 2 aircraft (airframe model)
- [Britten Norman BN 2A MKIII 2](https://openairdocs.org/model/britten-norman-bn-2a-mkiii-2): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/79-03-05/models.md
Every aircraft: https://openairdocs.org/ad/79-03-05/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.