# AD 80-13-13: Struts

- Type: Airworthiness directive
- Status: Current
- Products: Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and DHC-6-300
- Effective: July 1, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3816
- Registered aircraft: 88 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0ED5AE75F0C5082386256A4E00580C35.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-13-13

## The airworthiness directive

80-13-13 DEHAVILLAND: Amendment 39-3816. Applies to all DHC-6 model airplanes equipped with floats, certificated in all categories.

To prevent spreader strut lug failure and interference between float fitting and front strut, accomplish the following:

  (a) On aircraft Serial Numbers 1 thru 611 incorporating S.0.0. 6002 and 6082 float and chassis installation, within 100 hours in service or one month, whichever occurs first, after the effective date of this AD, unless previously accomplished, incorporate modifications in accordance with DeHavilland Service Bulletin 6/330, Revision "C", dated February 29, 1980, or approved equivalent modification.

  (b) On all aircraft with front spreader struts P/N C6UF1014-1, within 200 hours in service or two months, whichever occurs first, after the effective date of this AD, unless previously accomplished, incorporate modification in accordance with DeHavilland Service Bulletin 6/357, Revision "C", dated February 29, 1980, or approved equivalent modification.

  (c) Equivalent modifications must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

  (d) 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 July 1, 1980.

## 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/80-13-13/models.md
Every aircraft: https://openairdocs.org/ad/80-13-13/aircraft.md

Its text cites no advisory circulars or STCs.

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