AD 70-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McCauley Propeller Systems | 2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| aircraft | McCauley Propeller Systems | 2D36C14 | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| aircraft | McCauley Propeller Systems | B2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| propeller | McCauley Propeller Systems | 2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| propeller | McCauley Propeller Systems | 2D36C14 | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| propeller | McCauley Propeller Systems | B2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
Unsafe Condition
Propeller mid-blade and tip failures due to foreign object damage or cracks.
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Required Actions
Visually inspect blades for foreign object damage or cracks. Replace any cracked blades before further flight with a new blade inspected and repaired as necessary. Install a placard near the tachometer advising to avoid continuous operation between 2250 and 2550 r.p.m. with manifold pressure below 15 inches mercury.
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Compliance Time
within the next 25 hours time in service after the effective date of this AD
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Affected Aircraft
McCauley Propeller Systems models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E propellers on Lycoming O-360 type engines.
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Federal Register Abstract
Blades
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-04-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-04-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers Subject: Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/20/1970 Make: McCauley Propeller Systems Model: 2D34C | 2D36C14 | B2D34C Product Type: Propeller Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-04-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-939 AD NUMBER: 70-04-01 SUBJECT HEADING: MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers ACTION: SUMMARY: DATES: Effective February 20, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-04-01 MCCAULEY PROPELLERS: Amdt. 39-939. Applies to 2D36C14- (X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E propellers on Lycoming O-360 type engines. Compliance required within the next 25 hours time in service after the effective date of this AD, unless already accomplished. To prevent propeller mid-blade and tip failures accomplish the following: a. Visually inspect blades for foreign object damage or cracks. b. If blade is damaged, repair in accordance with instructions in McCauley Service Bulletin No. 76 dated 28 November 1969, or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. Replace any cracked blades before further flight with a new blade which has been inspected and repaired if necessary in accordance with this AD. c. Install the following placard near the tachometer: "Avoid continuous operation, while descending, between 2250 and 2550 r.p.m. with manifold pressure settings below 15 inches mercury". This amendment is effective February 20, 1970. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_70-04-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-04-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers Subject: Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/20/1970 Make: McCauley Propeller Systems Model: 2D34C | 2D36C14 | B2D34C 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: 70-04-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-939 AD NUMBER: 70-04-01 SUBJECT HEADING: MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers ACTION: SUMMARY: DATES: Effective February 20, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-04-01 MCCAULEY PROPELLERS: Amdt. 39-939. Applies to 2D36C14- (X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E propellers on Lycoming O-360 type engines. Compliance required within the next 25 hours time in service after the effective date of this AD, unless already accomplished. To prevent propeller mid-blade and tip failures accomplish the following: a. Visually inspect blades for foreign object damage or cracks. b. If blade is damaged, repair in accordance with instructions in McCauley Service Bulletin No. 76 dated 28 November 1969, or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. Replace any cracked blades before further flight with a new blade which has been inspected and repaired if necessary in accordance with this AD. c. Install the following placard near the tachometer: "Avoid continuous operation, while descending, between 2250 and 2550 r.p.m. with manifold pressure settings below 15 inches mercury". This amendment is effective February 20, 1970. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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