AD 73-19-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C20 | DETROIT DIESEL ALLISON Model 250-C20 Engine |
Unsafe Condition
Failure of the P/N 6875621 power turbine governor-to-fuel control fuel tube.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install the fuel tube supports specified in Allison Commercial Engine Bulletin 250-C20 CEB-1040, dated May 10, 1973, Revision 1, dated June 28, 1973, or later FAA approved revisions or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next fifty hours time in service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Corporation Model 250-C20 engine
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Turbine Governor-To-Fuel Control Tube
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_73-19-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-19-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DETROIT DIESEL ALLISON Model 250-C20 Engine Subject: Turbine Governor-To-Fuel Control Tube Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/14/1973 Make: Rolls-Royce Corporation Model: 250-C20 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 73-19-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1715 AD NUMBER: 73-19-07 SUBJECT HEADING: DETROIT DIESEL ALLISON Model 250-C20 Engine ACTION: SUMMARY: DATES: Effective September 14, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-19-07 DETROIT DIESEL ALLISON: Amdt. 39-1715. Applies to Detroit Diesel Allison Model 250- C20 engine. Compliance required within the next fifty hours time in service unless already accomplished. To prevent failure of the P/N 6875621 power turbine governor-to-fuel control fuel tube, install the fuel tube supports specified in Allison Commercial Engine Bulletin 250-C20 CEB-1040, dated May 10, 1973, Revision 1, dated June 28, 1973, or later FAA approved revisions or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region. This amendment is effective September 14, 1973. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_73-19-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-19-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DETROIT DIESEL ALLISON Model 250-C20 Engine Subject: Turbine Governor-To-Fuel Control Tube Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/14/1973 Make: Rolls-Royce Corporation Model: 250-C20 Product Type: Engine 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: 73-19-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1715 AD NUMBER: 73-19-07 SUBJECT HEADING: DETROIT DIESEL ALLISON Model 250-C20 Engine ACTION: SUMMARY: DATES: Effective September 14, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-19-07 DETROIT DIESEL ALLISON: Amdt. 39-1715. Applies to Detroit Diesel Allison Model 250- C20 engine. Compliance required within the next fifty hours time in service unless already accomplished. To prevent failure of the P/N 6875621 power turbine governor-to-fuel control fuel tube, install the fuel tube supports specified in Allison Commercial Engine Bulletin 250-C20 CEB-1040, dated May 10, 1973, Revision 1, dated June 28, 1973, or later FAA approved revisions or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region. This amendment is effective September 14, 1973. 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
2022-10-06 Recurring
final ruleAirworthiness Directives; Rolls-Royce Corporation Turboshaft Engines
Unsafe Condition: in-service turbine blade failures that resulted in the loss of power and engine in-flight shutdowns
2018-13-01
final ruleAirworthiness Directives; Rolls-Royce Corporation Turboshaft Engines
Unsafe Condition: Reports of engine power loss, one of which resulted in a fatal helicopter accident, due to failure of the power turbine governor (PTG) bearing assembly, part number (P/N) 2544198, due to the lack o...
2006-16-04
final ruleAirworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines
Unsafe Condition: Discovery that several part numbers (P/Ns) of fuel nozzles were inadvertently left out of AD 2004-24-09, which could lead to sudden loss of engine power and uncommanded shutdown of the engine due t...
2006-13-06
final ruleAirworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Unsafe Condition: Failure of gas producer rotor assembly tie bolts due to high cycle fatigue, which could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine fail...