AD 83-08-04 R3
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS355E | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters |
| aircraft | Airbus Helicopters | AS355F | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters |
Unsafe Condition
Loss of drive to the main rotor due to failure of epicyclic planet pinion cages with part numbers 350A32-3147-20 (over 150 hours time in service) or 350A32-1081-20/-21 (over 350 hours time in service).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace epicyclic planet pinion cages P/N 350A32-3147-20 with 150+ hours time in service within 10 hours time in service after AD effective date. Replace cages P/N 350A32-1081-20/-21 with 350+ hours time in service within 10 hours time in service after receipt. Replace cages with less than threshold hours before reaching 160 or 360 total hours respectively.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours time in service after the effective date of this AD (for P/N 350A32-3147-20) and within 10 hours time in service after receipt (for P/N 350A32-1081-20/-21).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Societe Nationale Industrielle Aerospatiale Model AS355 series helicopters equipped with epicyclic planet pinion cages P/N 350A32-3147-20 or 350A32-1081-20/-21.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Epicyclic Planet Pinion Cages
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_83-08-04_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 83-08-04 R3 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters Subject: Epicyclic Planet Pinion Cages Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Airbus Helicopters Model: AS355E | AS355F Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 83-08-04 R3 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4712 AD NUMBER: 83-08-04 R3 SUBJECT HEADING: Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 83-08-04 R3 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS): Amendment 39-4712, as revised by letter issued September 23, 1983. Applies to Societe Nationale Industrielle Aerospatiale Model AS355 series helicopters certificated in all categories, equipped with epicyclic planet pinion cages, P/N's 350A32-3147-20 and 350A32-1081-20 or -21 installed. Compliance is required as indicated (unless already accomplished). To prevent loss of drive to the main rotor, accomplish the following: (a) Within 10 hours time in service after the effective date of this AD, remove from service all helicopter transmission epicyclic planet pinion cages, P/N 350A32-3147-20, having 150 hours or m;ore total time in service and replace with a serviceable part. (b) For epicyclic planet pinion cages, P/N 350A32-3147-20, with less than 150 hours time in service, replace with a serviceable part prior to accumulation of 160 hours total time in service. (c) Within 10 hours time in service after receipt of this letter, remove from service all helicopter transmission epicyclic planet pinion cages, P/N 350A32-1081-20 or -21, having 350 hours or more total time in service and replace with a serviceable part. (d) For epicyclic planet pinion cages, P/N 350A32-1081-20 or -21, with less than 350 hours time in service, replace with a serviceable part prior to accumulation of 360 hours total time in service. Equivalent means of compliance must be approved by the Manager, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Beligum. Amendment 39-4712 became effective September 6, 1983, to all persons except those persons to whom it was made immediately effective by priority letter AD 83-08-04, issued April 21, 1983, revised July 21, 1983, which contained this amendment. This airworthiness directive becomes effective upon receipt. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_83-08-04_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 83-08-04 R3 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters Subject: Epicyclic Planet Pinion Cages Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Airbus Helicopters Model: AS355E | AS355F 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 83-08-04 R3 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4712 AD NUMBER: 83-08-04 R3 SUBJECT HEADING: Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 83-08-04 R3 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS): Amendment 39-4712, as revised by letter issued September 23, 1983. Applies to Societe Nationale Industrielle Aerospatiale Model AS355 series helicopters certificated in all categories, equipped with epicyclic planet pinion cages, P/N's 350A32-3147-20 and 350A32-1081-20 or -21 installed. Compliance is required as indicated (unless already accomplished). To prevent loss of drive to the main rotor, accomplish the following: (a) Within 10 hours time in service after the effective date of this AD, remove from service all helicopter transmission epicyclic planet pinion cages, P/N 350A32-3147-20, having 150 hours or m;ore total time in service and replace with a serviceable part. (b) For epicyclic planet pinion cages, P/N 350A32-3147-20, with less than 150 hours time in service, replace with a serviceable part prior to accumulation of 160 hours total time in service. (c) Within 10 hours time in service after receipt of this letter, remove from service all helicopter transmission epicyclic planet pinion cages, P/N 350A32-1081-20 or -21, having 350 hours or more total time in service and replace with a serviceable part. (d) For epicyclic planet pinion cages, P/N 350A32-1081-20 or -21, with less than 350 hours time in service, replace with a serviceable part prior to accumulation of 360 hours total time in service. Equivalent means of compliance must be approved by the Manager, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Beligum. Amendment 39-4712 became effective September 6, 1983, to all persons except those persons to whom it was made immediately effective by priority letter AD 83-08-04, issued April 21, 1983, revised July 21, 1983, which contained this amendment. This airworthiness directive becomes effective upon receipt. FOOTER:
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Retrieved: Apr 8, 2026
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