# AD 67-28-03: Horizontal Stabilizer

- Type: Airworthiness directive
- Status: Current
- Products: Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and DHC-6-300
- Effective: October 21, 1967
- Published: October 21, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-494
- Registered aircraft: 88 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9D1C174271A81B7186256A34006D9DD9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/67-28-03

## The airworthiness directive

67-28-03 de HAVILLAND: Amdt. 39-494, Part 39, Federal Register October 21, 1967. Applies to Type DHC-6 Aircraft.

Compliance required as indicated.

To preclude loss of the horizontal stabilizer, accomplish the following:

  (a) Within the next 15 hours' time in service after the effective date of this AD, unless already accomplished, check that each of the four horizontal tailplane to aft fuselage 5/16 inch diameter bolts, P/N's NAS 625-36 and NAS 625-53, are torqued to a value of 225 to 250 inch-pounds. If correct, no further action is necessary. If loose, comply with (b).

  (b) Re-torque loose bolts to a value of 225 to 250 inch-pounds and recheck every 7 hours' time in service to assure that this value is maintained.

  (c) The check required by (b) may be discontinued when a modification, approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region is incorporated.

  (d) Upon request with substantiating data submitted through an FAA maintenance inspector, the compliance times specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

This amendment effective October 21, 1967.

## 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/67-28-03/models.md
Every aircraft: https://openairdocs.org/ad/67-28-03/aircraft.md

Its text cites no advisory circulars or STCs.

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