AD 83-08-04 R3

final rule

Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters

AD Number
83-08-04 R3
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.
Technical illustration of a helicopter rotor hub assembly
Problem area Rotor system

Applicability

TypeManufacturerModelDetails
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
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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:

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.