# AD 71-14-05: Possible Explosion in Bays 9 and  2

- Type: Airworthiness directive
- Status: Current
- Products: Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and DHC-6-300 with STC SA1837WE
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1242
- Registered aircraft: 88 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0953622C2975926286256A34006ED7F0.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/71-14-05

## The airworthiness directive

71-14-05 de HAVILLAND AIRCRAFT of CANADA, LTD: Amdt. 39-1242. Applies to de Havilland Model DHC-6 Series airplanes modified in accordance with JB Systems, Inc. STC SA1837WE.

Compliance required within the next 10 hours' time in service after the effective date of this AD.

To prevent possible explosion in bays 9 and 10 due to the operation of electrical components, accomplish the following, unless already accomplished:

Deactivate the JB Systems air conditioner by disconnecting the source of power at the distribution bus, until the F.S. 281 bulkhead and other areas are sealed, per JB Systems, Inc., Service Bulletin No. 011, dated June 8, 1971, or later FAA approved revisions, or an equivalent sealing process is performed upon approval by the Chief, Aircraft Engineering Division, FAA Western Region.

This amendment is effective upon publication in the Federal Register, except for all operators in receipt of this AD, by letter dated June 24, 1971, from FAA Aeronautical Center, Oklahoma City, Oklahoma. As to these operators, this AD is effective upon receipt of said letter.

This amendment is effective upon publication in the Federal Register except for those recipients of letters dated June 24, 1971, which contained this amendment.

## 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/71-14-05/models.md
Every aircraft: https://openairdocs.org/ad/71-14-05/aircraft.md

## Related documents

- [STC SA1837WE](https://openairdocs.org/stc/SA1837WE): Installation of freon air-conditioning system. Air Comm Corporation, Named in the applicability

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