AD 74-22-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | 6-285-B | TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines |
Unsafe Condition
Omission of crankcase main bearing oil supply passages could result in insufficient lubrication, leading to bearing failure and engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect crankcase main bearing oil supply passages per Teledyne Continental Service Bulletin M74-21. If an omitted oil passage is found, remove the engine from service.
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Compliance Time
within the next 25 hours time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Teledyne Continental Motors Model 6-285-B engines with serial numbers 700000 through 700095
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Federal Register Abstract
Crankcase
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-22-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-22-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines Subject: Crankcase Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/28/1974 Make: Continental Motors Model: 6-285-B Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 74-22-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1998 AD NUMBER: 74-22-04 SUBJECT HEADING: TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines ACTION: SUMMARY: DATES: Effective October 28, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-22-04 TELEDYNE CONTINENTAL MOTORS: Amendment 39-1998. Applies to TCM Model 6-285- B engines with engine serial numbers 700000 through 700095. Compliance required within the next 25 hours time in service after the effective date of this AD unless already accomplished. Inspect the crankcase main bearing oil supply passages in accordance with procedures outlined in Teledyne Continental Service Bulletin M74-21. After compliance with this bulletin, if it is determined that an oil passage has been omitted the engine must be removed from service. This amendment becomes effective October 28, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-22-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-22-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines Subject: Crankcase Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/28/1974 Make: Continental Motors Model: 6-285-B 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 74-22-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1998 AD NUMBER: 74-22-04 SUBJECT HEADING: TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines ACTION: SUMMARY: DATES: Effective October 28, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-22-04 TELEDYNE CONTINENTAL MOTORS: Amendment 39-1998. Applies to TCM Model 6-285- B engines with engine serial numbers 700000 through 700095. Compliance required within the next 25 hours time in service after the effective date of this AD unless already accomplished. Inspect the crankcase main bearing oil supply passages in accordance with procedures outlined in Teledyne Continental Service Bulletin M74-21. After compliance with this bulletin, if it is determined that an oil passage has been omitted the engine must be removed from service. This amendment becomes effective October 28, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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