# AD 68-26-02: Wing Strut Inspection

- Type: Airworthiness directive
- Status: Current
- Products: Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and DHC-6-300
- Effective: December 20, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-694
- Registered aircraft: 88 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A9C881C56E4D176E86256A34006E2254.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/68-26-02

## The airworthiness directive

68-26-02 DE HAVILLAND: Amdt. 39-694. Applies to DHC-6 Type Airplanes.

To detect loose or missing jo-bolts in wing struts which have accumulated 150 or more hours time in service as of the effective date of this A.D., accomplish the following:

  (a) Within the next 50 hours time in service, unless already accomplished, visually inspect the top and bottom of the right and left wing struts, P/N C6W1005-3, -4, for loose or missing jo-bolts in accordance with the procedure described in deHavilland Service Bulletin No. 6/166, or an FAA approved equivalent procedure.

  (b) Identical inspections must be conducted at subsequent times in service of 450 to 550 hours, 2450 to 2550 hours and 7450 to 7550 hours after the inspection required by (a) and thereafter at intervals not to exceed 5000 hours time in service.

  (c) Prior to further flight, missing jo-bolts must be replaced with jo-bolts of the same part number or an FAA approved equivalent part; but a maximum of four (4)missing in any strut may be replaced within the next 250 hours time in service provided:

  (1) they are not all next to each other in the same row of twelve (12); or

  (2) they do not include more than two (2) which are next to each other in the same row of twelve (12) within six (6) inches of the strut end.

  (d) Equivalent parts and inspection procedures must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

  (e) The compliance times may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, upon receipt of substantiating data submitted through an FAA maintenance inspector.

This amendment is effective December 20, 1968.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A9EA](https://openairdocs.org/tcds/A9EA): De Havilland Aircraft of Canada Limited; names 4 of 5 models: DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300

## 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: 88 (88 by airframe model, 0 by engine model)
- Makers: Dehavilland 84, Dehavilland Acft Of Canada 4

Models with the most aircraft:

- [Dehavilland DHC-6-300](https://openairdocs.org/model/dehavilland-dhc-6-300): 59 aircraft (airframe model)
- [Dehavilland DHC-6-200](https://openairdocs.org/model/dehavilland-dhc-6-200): 19 aircraft (airframe model)
- [Dehavilland DHC-6-100](https://openairdocs.org/model/dehavilland-dhc-6-100): 6 aircraft (airframe model)
- [Dehavilland Acft Of Canada DHC 6-300](https://openairdocs.org/model/dehavilland-acft-of-canada-dhc-6-300): 4 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/68-26-02/models.md
Every aircraft: https://openairdocs.org/ad/68-26-02/aircraft.md

Its text cites no advisory circulars or STCs.

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