# AD 56-11-01: Oil Pressure and Temperature Gage

- Type: Airworthiness directive
- Status: Current
- Products: de Havilland Aircraft Co., Ltd., The D.H. 104 Dove Series 1A, D.H. 104 Dove Series 2A, D.H. 104 Dove Series 5A, D.H. 104 Dove Series 5BA, D.H. 104 Dove Series 6A, D.H. 104 Dove Series 6BA, D.H. 104 Dove Series 7A, D.H. 104 Dove Series 7AXC, D.H. 104 Dove Series 8A and D.H. 104 Dove Series 8AXC
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 3 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/72E50984D048F2D786256A34006BCD6C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/56-11-01

## The airworthiness directive

56-11-01 de HAVILLAND: Applies to All Model 104 "Dove" Aircraft.

Compliance required by May 31, 1956.

As a result of the two accidents caused by pilots feathering the wrong propeller after engine failure, the British Air Registration Board has classified the following as an essential modification. The FAA concurs.

The left-hand needle (oil pressure) of the combined oil pressure and temperature gage for the starboard engine could be mistakenly interpreted as applying to the port engine. To minimize the possibility of such confusion either Part A or part B of Dove Modification 879 must be incorporated as soon as possible but not later than May 31, 1956:

Part A. To turn the instruments clockwise through 90 degrees and put temporary markings on the instrument bezel.

Part B. To turn the instruments clockwise through 90 degrees and re-mark the dials to give correct presentation or to fit modified instruments with vertical lettering and figures.

(Dove Modification 879 is covered in de Havilland Service Technical News Sheet Series CT (104) No. 132 dated April 13, 1956.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-807](https://openairdocs.org/tcds/A-807): Acro Aeronautical Services Ltd; names 10 of 10 models: D.H. 104 Dove Series 8A, D.H. 104 Dove Series 7A, D.H. 104 Dove Series 1A, D.H. 104 Dove Series 5A, D.H. 104 Dove Series 7AXC, D.H. 104 Dove Series 8AXC, D.H. 104 Dove Series 2A, D.H. 104 Dove Series 5BA…

## 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: Dehavilland 3

Models with the most aircraft:

- [Dehavilland DH104 DOVE 6A](https://openairdocs.org/model/dehavilland-dh104-dove-6a): 3 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/56-11-01/models.md
Every aircraft: https://openairdocs.org/ad/56-11-01/aircraft.md

Its text cites no advisory circulars or STCs.

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