AD 66-09-01

final rule

DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers

AD Number
66-09-01
Status
final_rule
Effective Date
Product Category
propeller
Docket
Unknown
FR Citation
This information is not available.
Technical illustration of an aircraft propeller assembly
Problem area Propeller

Applicability

TypeManufacturerModelDetails
aircraft Dowty Propellers (c) R130/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R148/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R175/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R179/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R184/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R186/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
aircraft Dowty Propellers (c) R193/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R130/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R148/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R175/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R179/4-20-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R184/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R186/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers
propeller Dowty Propellers (c) R193/4-30-4/ DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers

Unsafe Condition

Failures of the bond between the deicing boots and the propeller blade's surface

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Apply preprimer Cellon SL4853/4854 or FAA-approved equivalent to the propeller blade surfaces before other primers, in accordance with Dowty Rotol Service Bulletin No. 61-157 (Modification No. (c) VP.1941) Revision 2 or later ARB-approved revision.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

at the next replacement of deicer boots after the effective date of this AD

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Dowty Propellers models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and (c) R179/4-20-4/33 with blade serial numbers below A.105040 installed on specified aircraft models

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

Blade

Applicability Source Text

Show captured applicability text from the source AD 
AD Final Rules - DRS_66-09-01.html
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AD Number:
66-09-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50...Show more
Subject:
Blade
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/13/1966
Make:
Dowty Propellers
Model:
(c) R130/4-20-4/ | (c) R148/4-20-4/ | (c) R175/4-30-4/ | (c) R179/4-20-4/ | (c) R184/4-30-4/ | (c) R...Show more
Product Type:
Propeller
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 66-09-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-210

AD NUMBER:   66-09-01

SUBJECT HEADING:   DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers

ACTION:  

SUMMARY:  

DATES:   Effective September 13, 1966.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
66-09-01 DOWTY ROTOL: Amdt. 39-210 Part 39 Federal Register March 16, 1966. Applies to the following Dowty Rotol Propellers with Propeller Blade Serial Numbers Below A.105040: (c) R175/4-30-4/13E Installed on Fairchild F-27 and F-27B; (c) R193/4-30-4/50, Installed on Fairchild F-27A, F-27F, and F-27G; (c) R186/4-30-4/16, Installed on Armstrong Whitworth Argosy Type AW650 Series 101; (c) R184/4-30-4/50, Installed on Grumman G-159; (c) R148/4-20-4/21E, Installed on Viscount 744, (c) R130/4-20-4/12E, Installed on Viscount 745D; and (c) R179/4-20-4/33, Installed on Viscount 810.

Compliance required at the next replacement of deicer boots after the effective date of this AD, unless already accomplished.

To prevent failures of the bond between the deicing boots and the propeller blade's surface, accomplish the following:

Apply preprimer Cellon SL4853/4854, or on FAA-approved equivalent, to the surface of the propeller blades before the application of any other primers, in accordance with Dowty Rotol Service Bulletin No. 61-157 (Modification No. (c) VP.1941) Revision 2 or later ARB-approved revision.

This directive effective April 15, 1966.

Revised September 13, 1966.

FOOTER:

Document Text

Show stored source text (verify against official source) 
AD Final Rules - DRS_66-09-01.html
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Details
AD Number:
66-09-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50...Show more
Subject:
Blade
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/13/1966
Make:
Dowty Propellers
Model:
(c) R130/4-20-4/ | (c) R148/4-20-4/ | (c) R175/4-30-4/ | (c) R179/4-20-4/ | (c) R184/4-30-4/ | (c) R...Show more
Product Type:
Propeller
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 66-09-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-210

AD NUMBER:   66-09-01

SUBJECT HEADING:   DOWTY ROTOL Models (c) R175/4-30-4/13E, (c) R193/4-30-4/50, (c) R186/4-30-4/16, (c) R184/4-30-4/50, (c) R148/4-20-4/21E, (c) R130/4-20-4/12E, and R179/4-20-4/33 Propellers

ACTION:  

SUMMARY:  

DATES:   Effective September 13, 1966.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
66-09-01 DOWTY ROTOL: Amdt. 39-210 Part 39 Federal Register March 16, 1966. Applies to the following Dowty Rotol Propellers with Propeller Blade Serial Numbers Below A.105040: (c) R175/4-30-4/13E Installed on Fairchild F-27 and F-27B; (c) R193/4-30-4/50, Installed on Fairchild F-27A, F-27F, and F-27G; (c) R186/4-30-4/16, Installed on Armstrong Whitworth Argosy Type AW650 Series 101; (c) R184/4-30-4/50, Installed on Grumman G-159; (c) R148/4-20-4/21E, Installed on Viscount 744, (c) R130/4-20-4/12E, Installed on Viscount 745D; and (c) R179/4-20-4/33, Installed on Viscount 810.

Compliance required at the next replacement of deicer boots after the effective date of this AD, unless already accomplished.

To prevent failures of the bond between the deicing boots and the propeller blade's surface, accomplish the following:

Apply preprimer Cellon SL4853/4854, or on FAA-approved equivalent, to the surface of the propeller blades before the application of any other primers, in accordance with Dowty Rotol Service Bulletin No. 61-157 (Modification No. (c) VP.1941) Revision 2 or later ARB-approved revision.

This directive effective April 15, 1966.

Revised September 13, 1966.

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.

View Official Source ↗ Find More ADs for Dowty Propellers (c) R130/4-20-4/

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72-07-07

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69-23-04

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