AD 78-09-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers |
| propeller | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers |
Unsafe Condition
Propeller hub and driving center assembly failure due to corrosion, and subsequent possible propeller failure.
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Required Actions
Within 1000 hours time in service after the effective date or at the next scheduled propeller overhaul, inspect the hub and driving center assembly per SB 61-882 and referenced manuals. If corrosion exceeds limits, replace the assembly before further operation.
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Compliance Time
Within the next 1000 hours time in service after the effective date of this AD, or at the next scheduled propeller overhaul, whichever occurs first
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Affected Aircraft
Dowty Rotol Models R193/4-30-4/50 and R193/4-30-4/61 propellers with specified serial numbers installed on Fairchild and Fokker airplanes.
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Federal Register Abstract
Hub and Driving Center Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-09-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-09-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers Subject: Hub and Driving Center Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/22/1978 Make: Dowty Propellers Model: (c) R193/4-30-4/ Product Type: Propeller Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-09-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3196 AD NUMBER: 78-09-03 SUBJECT HEADING: DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers ACTION: SUMMARY: DATES: Effective May 22, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-09-03 DOWTY ROTOL, LTD.: Amendment 39-3196. Applies to Dowty Rotol Type R193/4-30-4/50 and R193/4-30-4/61 propellers of the following serial numbers which may be installed on, but not necessarily limited to, Fairchild Model F27A, F27F, F27J, FH-227, and FH- 227-1; and Fokker F-27 Mks. 200, 400, 500 and 600 airplanes: 193/60/167 DRG/34/61 DRG/66/62 DRG/284/63 DRG/120/64 DRG/4/61 DRG/35/61 DRG/19/63 DRG/285/63 DRG/121/64 DRG/5/61 DRG/2/62 DRG/22/63 DRG/286/63 DRG/122/64 DRG/6/61 DRG/3/62 DRG/24/63 DRG/287/63 DRG/123/64 DRG/7/61 DRG/33/62 DRG/25/63 DRG/320/63 DRG/138/64 DRG/9/61 DRG/35/62 DRG/26/63 DRG/321/63 DRG/141/64 DRG/13/61 DRG/36/62 DRG/72/63 DRG/337/63 DRG/142/64 DRG/14/61 DRG/37/62 DRG/134/63 DRG/14/64 DRG/158/64 DRG/25/61 DRG/41/62 DRG/136/63 DRG/17/64 DRG/207/64 DRG/26/61 DRG/42/62 DRG/222/63 DRG/36/64 DRG/208/64 DRG/27/61 DRG/49/62 DRG/224/63 DRG/78/64 DRG/292/66 DRG/33/61 DRG/50/62 DRG/226/63 DRG/79/64 DRG/296/66 Compliance is required as indicated, unless already accomplished. To reduce the possibility of propeller hub and driving center assembly failure due to corrosion, and subsequent possible propeller failure, accomplish the following: (a) Within the next 1000 hours time in service after the effective date of this AD, or at the next scheduled propeller overhaul, whichever occurs first, inspect the propeller hub and driving center assembly in accordance with Dowty Rotol Service Bulletin 61-882, dated March 11, 1977 (hereinafter SB 61-882), and the therein referenced Dowty Rotol Propeller Overhaul Manual Pub. No. 61-2-2, Repair Scheme Manual Pub. No. 923; and Process Specification Manual Pub. No. 872, or FAA-approved equivalents. (b) If, as a result of the inspection required by paragraph (a) of this AD, propeller hub or driving center assembly corrosion is found to exceed the limits specified in Dowty Rotol Overhaul Manual 61-2-2 and Repair Scheme Manual Publication No. 923 Repair Schemes 650013110 and 650013120 or an FAA-approved equivalent, before further operation, replace the propeller hub and driving center assembly with a serviceable propeller hub and driving center assembly or an FAA-approved equivalent. (c) The equivalent means of compliance specified in paragraphs (a) and (b) of this AD must be approved by the Chief, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Region, Federal Aviation Administration, c/o American Embassy, Brussels Belgium. This amendment becomes effective May 22, 1978. FOOTER:
Document Text
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AD Final Rules - DRS_78-09-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-09-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers Subject: Hub and Driving Center Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/22/1978 Make: Dowty Propellers Model: (c) R193/4-30-4/ 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: 78-09-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3196 AD NUMBER: 78-09-03 SUBJECT HEADING: DOWTY ROTOL, LTD. Models R193/4-30-4/50 and R193/4-30-4/61 Propellers ACTION: SUMMARY: DATES: Effective May 22, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-09-03 DOWTY ROTOL, LTD.: Amendment 39-3196. Applies to Dowty Rotol Type R193/4-30-4/50 and R193/4-30-4/61 propellers of the following serial numbers which may be installed on, but not necessarily limited to, Fairchild Model F27A, F27F, F27J, FH-227, and FH- 227-1; and Fokker F-27 Mks. 200, 400, 500 and 600 airplanes: 193/60/167 DRG/34/61 DRG/66/62 DRG/284/63 DRG/120/64 DRG/4/61 DRG/35/61 DRG/19/63 DRG/285/63 DRG/121/64 DRG/5/61 DRG/2/62 DRG/22/63 DRG/286/63 DRG/122/64 DRG/6/61 DRG/3/62 DRG/24/63 DRG/287/63 DRG/123/64 DRG/7/61 DRG/33/62 DRG/25/63 DRG/320/63 DRG/138/64 DRG/9/61 DRG/35/62 DRG/26/63 DRG/321/63 DRG/141/64 DRG/13/61 DRG/36/62 DRG/72/63 DRG/337/63 DRG/142/64 DRG/14/61 DRG/37/62 DRG/134/63 DRG/14/64 DRG/158/64 DRG/25/61 DRG/41/62 DRG/136/63 DRG/17/64 DRG/207/64 DRG/26/61 DRG/42/62 DRG/222/63 DRG/36/64 DRG/208/64 DRG/27/61 DRG/49/62 DRG/224/63 DRG/78/64 DRG/292/66 DRG/33/61 DRG/50/62 DRG/226/63 DRG/79/64 DRG/296/66 Compliance is required as indicated, unless already accomplished. To reduce the possibility of propeller hub and driving center assembly failure due to corrosion, and subsequent possible propeller failure, accomplish the following: (a) Within the next 1000 hours time in service after the effective date of this AD, or at the next scheduled propeller overhaul, whichever occurs first, inspect the propeller hub and driving center assembly in accordance with Dowty Rotol Service Bulletin 61-882, dated March 11, 1977 (hereinafter SB 61-882), and the therein referenced Dowty Rotol Propeller Overhaul Manual Pub. No. 61-2-2, Repair Scheme Manual Pub. No. 923; and Process Specification Manual Pub. No. 872, or FAA-approved equivalents. (b) If, as a result of the inspection required by paragraph (a) of this AD, propeller hub or driving center assembly corrosion is found to exceed the limits specified in Dowty Rotol Overhaul Manual 61-2-2 and Repair Scheme Manual Publication No. 923 Repair Schemes 650013110 and 650013120 or an FAA-approved equivalent, before further operation, replace the propeller hub and driving center assembly with a serviceable propeller hub and driving center assembly or an FAA-approved equivalent. (c) The equivalent means of compliance specified in paragraphs (a) and (b) of this AD must be approved by the Chief, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Region, Federal Aviation Administration, c/o American Embassy, Brussels Belgium. This amendment becomes effective May 22, 1978. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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Related Airworthiness Directives
2010-10-23
final ruleAirworthiness Directives; Dowty Propellers R175/4-30-4/13; R175/4-30-4/13e; R184/4-30-4/50; R193/4-30-4/50; R193/4-30-4/61; R193/4-30-4/64; R193/4-30-4/65; R193/4-30-4/66; R.209/4-40-4.5/2; R212/4-30-4/22; R.245/4-40-4.5/13; R257/4-30-4/60; and R.259/4-40-4.5/17 Model Propellers
Unsafe Condition: could result in reduced controllability of the airplane.
81-16-02
final ruleDOWTY ROTOL, LTD. Propeller Types
Unsafe Condition: Cracks in the propeller pitch lock cylinder
76-18-03
final ruleDOWTY ROTOL Models (c)R193/4-30-4/50, (c)R257/4-30-4/60, and (c)R184/4-30-4/50 Propellers
Unsafe Condition: Cracking and possible failure of the hub driving center due to improper machining.
72-14-01
final ruleDOWTY ROTOL, LTD Models (c)R130/4-20-4/12E, (c)R186/4-30-4/16, (c)R187/4-30-4/18, (c)R193/4-30-4/50, (c)R184/4-30-4/50, (c)R259/4-40-4.5/17, (c)R148/4-20-4/21E, (c)R175/4-30-4/13E, (c)R179/4- 20-4/33, (c)R257/4-30-4/60, (c)R245/4-40-4.5/13, and (c)R209/4-40-4.5/2 Propellers
Unsafe Condition: Failure of a propeller blade due to the disengagement of the blade bearing retaining bolts resulting from excessive wear on the teeth of the locking segments.