AD 86-23-08

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AD Number:
86-23-08
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
Subject:
Main Rotor Hub Lower Plate
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
04/21/1987
Make:
Sikorsky Aircraft Corporation
Model:
S-61A | S-61D | S-61E | S-61L | S-61N | S-61NM | S-61R | S-61V
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Superseded AD: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Superseded By: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: 86-23-08
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5590

AD NUMBER:   86-23-08

SUBJECT HEADING:   Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective April 21, 1987

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
86-23-08 SIKORSKY AIRCRAFT: Amendment 39-5590. Applies to Model S-61 series helicopters, certificated in any category, with main rotor hub lower plate, P/N S6110-23009-6 or -8, installed.

For helicopters with main rotor hub lower plates with more than 27,000 hours' time in service on the effective date of this AD, compliance is required prior to further flight, unless already accomplished, and thereafter at intervals not to exceed 27,000 hours' time in service.

For helicopters with main rotor hub lower plate with 27,000 or less hours' time in service on the effective date of this AD, compliance is required prior to the accumulation of 27,000 hours' time in service, unless already accomplished, and thereafter at intervals not to exceed 27,000 hours' time in service.

To prevent cracking of the main rotor hub lower plate, accomplish the following:

(a) Remove and replace the main rotor hub lower plate, P/N S6110-23009-6 or -8, with a new or an airworthy part of the same part number that has less than 27,000 -hours' time in service.

(b) In accordance with FAR sections 21.197 and 21.199, the helicopter may be flown to a base where compliance may be accomplished.

(c) An alternate method of compliance or adjustment of the initial compliance time which provides an equivalent level of safety, may be approved by the Manager, 30 Sikorsky Boston Aircraft Certification Office, FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.

This amendment becomes effective April 21, 1987, to all persons except those persons to whom it was made immediately effective by priority letter AD 86-23-08, issued November 17, 1986, which contained this amendment.

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