AD 56-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 1A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 2A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 5A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 5BA | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 6A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 6BA | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 7A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 7AXC | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 8A | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
| aircraft | de Havilland Aircraft Co., Ltd., The | D.H. 104 Dove Series 8AXC | Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft |
Unsafe Condition
The left-hand needle (oil pressure) of the combined oil pressure and temperature gauge for the starboard engine could be mistakenly interpreted as applying to the port engine, leading to incorrect propeller feathering after an engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Either turn the instruments clockwise through 90 degrees and add temporary bezel markings (Part A) or re-mark dials for correct presentation/fit modified instruments with vertical lettering and figures (Part B).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than May 31, 1956
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Affected Aircraft
de Havilland Aircraft Co., Ltd. Model D.H. 104 Dove Series 1A, 2A, 5A, and other listed series
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Oil Pressure and Temperature Gage
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_56-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-11-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft Subject: Oil Pressure and Temperature Gage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: de Havilland Aircraft Co., Ltd., The Model: D.H. 104 Dove Series 1A | D.H. 104 Dove Series 2A | D.H. 104 Dove Series 5A | D.H. 104 Dove Series 5...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-11-01 SUBJECT HEADING: Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_56-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-11-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft Subject: Oil Pressure and Temperature Gage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: de Havilland Aircraft Co., Ltd., The Model: D.H. 104 Dove Series 1A | D.H. 104 Dove Series 2A | D.H. 104 Dove Series 5A | D.H. 104 Dove Series 5...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-11-01 SUBJECT HEADING: Airworthiness Directives; de Havilland Model 104 "Dove" Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
79-02-07
final ruleAirworthiness Directives; Hawker Siddeley Aviation, Limited (British Aerospace) Model DH-104 "Dove" Series Airplanes
Unsafe Condition: Failure of the wing to fuselage attachment and loss of wing in flight due to cracks in the upper three lugs at each end of the center section main spar top boom, P/N 4FS.135 A/1.
78-09-04
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Unsafe Condition: Cracking and possible failure of the lugs of the lower center section main spar wing to fuselage attachment.
77-16-04
final ruleAirworthiness Directives; Hawker Siddeley Aviation, Ltd de Havilland Model DH-104 "Dove" Series Airplanes
Unsafe Condition: Fatigue failure of the wing structure due to insufficient fatigue life of the wing lower spar boom and fuselage center section lower spar boom.
77-14-15
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Unsafe Condition: Corrosion of engine mount stay struts, part numbers 4 EM.357A and 4 EM.359A, could result in structural failure.
