AD 73-16-01

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AD Number:
73-16-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Sikorsky Model S-55 Series Helicopters
Subject:
Engine Turbine Failure
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
07/31/1973
Make:
Sikorsky Aircraft Corporation
Model:
S-55 | S-55B | S-55C
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Superseded AD: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Superseded By: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: 73-16-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1694

AD NUMBER:   73-16-01

SUBJECT HEADING:   Airworthiness Directives; Sikorsky Model S-55 Series Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective July 31, 1973. For all persons except those to whom it was made effective immediately by telegram dated 7/17/73.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
73-16-01 SIKORSKY: Amendment 39-1694.

Pursuant to the authority of the Federal Aviation Act of 1958, as amended, delegated to me by the Administrator, the following airworthiness directive applicable to operators of Sikorsky S-55 series helicopters modified to incorporate AiResearch TSE331-3U-303N engines installed in accordance with Supplemental Type Certificate No. SH125-WE or SH127WE was effective immediately upon receipt of the telegram dated July 17, 1973. This directive is necessary because of the possibility of engine overspeed and resultant third stage turbine failure. Except as provided by FAR 21.197, the following is required prior to further flight:

(a) Install a fuel bypass system in accordance with AiResearch Service Bulletin No. TSE331-73-5004 and Aviation Specialties Service Bulletin No. AS55-01-1, both dated July 16, 1973, or later FAA-Approved revisions thereto.

(b) Incorporate the FAA-Approved Aviation Specialties Rotorcraft Flight Manual Revision 3 dated July 17, 1973.

(c) Equivalent modifications and rotorcraft flight manual revisions may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

This amendment is effective July 31, 1973, for all persons except those to whom it was made effective immediately by telegram dated July 17, 1973.

FOOTER: