AD 87-25-02

AD Final Rules - DRS_87-25-02.html
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AD Number:
87-25-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A and S-76B Series Helicopters
Subject:
Ground Connections
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
12/31/1987
Make:
Sikorsky Aircraft Corporation
Model:
S-76A | S-76B
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Superseded AD: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Superseded By: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: 87-25-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5778

AD NUMBER:   87-25-02

SUBJECT HEADING:   Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A and S-76B Series Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective December 31, 1987.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
87-25-02 SIKORSKY AIRCRAFT: Amendment 39-5778. Applies to all Model S-76A and S-76B series helicopters through and including serial number 760350, certified in any category.

Compliance is required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent possible loss of AC electrical power due to 26 VAC transformer single ground connection failure, provide separate ground connections for 26 VAC transformers 1 and 2.

NOTE: Sikorsky Service Bulletin No. 76-24-5, AC Electrical Power System - AC Power Transformer Ground Wires Termination-Separation of, dated October 19, 1987, constitutes an acceptable means of compliance with this requirement.

This amendment becomes effective December 31, 1987.

FOOTER: