AD 78-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109 | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109A II | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109C | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109E | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
| aircraft | Agusta S.p.A. | A109K2 | Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters |
Unsafe Condition
Failure of main transmission due to pinion gear P/N 109-0403-06-01 with serial numbers 18, 24, 25, or 27 installed in main transmissions S/N 31, 36, 11, and 10 respectively.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove pinion gear P/N 109-0403-06-01 with serial numbers 18, 24, 25, or 27 from main transmissions S/N 31, 36, 11, and 10 respectively. Replace with new pinion gear of the same part number but with serial numbers other than 17 through 32.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Agusta S.p.A. Model A109 Series helicopters with serial numbers 7107, 7111, 7126, and 7129
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Transmission
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters Subject: Main Transmission Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/24/1978 Make: Agusta S.p.A. Model: A109 | A109A | A109A II | A109C | A109E | A109K2 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3346 AD NUMBER: 78-24-02 SUBJECT HEADING: Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters ACTION: SUMMARY: DATES: Effective November 24, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-24-02 COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Amendment 39- 3346. Applies to Agusta Model A109 Series helicopters, S/N 7107, 7111, 7126, and 7129, certificated in all categories. Compliance required before further flight, unless already accomplished, but helicopter may be flown in accordance with FAR 21.197 and 21.199 to a base where the required work can be performed. To prevent possible failure of main transmission P/N 109-0400-02-01, remove pinion gear P/N 109- 0403-06-01, S/N 18, 24, 25 or 27, from main transmissions S/N 31, 36, 11 and 10, respectively, and replace with new pinion gear of same part number having serial number other than 17 through 32. This amendment is effective November 24, 1978, as to all persons except those persons to whom it was made immediately effective by the letter dated April 26, 1978, which contained this amendment FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_78-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters Subject: Main Transmission Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/24/1978 Make: Agusta S.p.A. Model: A109 | A109A | A109A II | A109C | A109E | A109K2 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3346 AD NUMBER: 78-24-02 SUBJECT HEADING: Airworthiness Directives; Costruzioni Aeronautiche Model A109 Series Helicopters ACTION: SUMMARY: DATES: Effective November 24, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-24-02 COSTRUZIONI AERONAUTICHE GIOVANNI AGUSTA: Amendment 39- 3346. Applies to Agusta Model A109 Series helicopters, S/N 7107, 7111, 7126, and 7129, certificated in all categories. Compliance required before further flight, unless already accomplished, but helicopter may be flown in accordance with FAR 21.197 and 21.199 to a base where the required work can be performed. To prevent possible failure of main transmission P/N 109-0400-02-01, remove pinion gear P/N 109- 0403-06-01, S/N 18, 24, 25 or 27, from main transmissions S/N 31, 36, 11 and 10, respectively, and replace with new pinion gear of same part number having serial number other than 17 through 32. This amendment is effective November 24, 1978, as to all persons except those persons to whom it was made immediately effective by the letter dated April 26, 1978, which contained this amendment FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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