[Federal Register Volume 66, Number 14 (Monday, January 22, 2001)]
[Notices]
[Page 6753]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-1858]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


TSO-C77b, Gas Turbine Auxiliary Power Units

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of availability of technical standard order.

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SUMMARY: This notice announces the availability of Technical Standard 
Order (TSO) C77b. This TSO prescribes the minimum performance standards 
that gas turbine auxiliary power units (APUs), commonly used in 
commercial aircraft, must meet in order to be identified with the TSO 
marking.

EFFECTIVE DATE: January 22, 2001.

FOR FURTHER INFORMATION CONTACT: Mr. Mark A. Rumizen, Engine and 
Propeller Standards Staff, ANE-110, Engine and Propeller Directorate, 
Federal Aviation Administration, 12 New England Executive Park, 
Burlington, MA 01803-5299, telephone (781) 238-7113, fax (781) 238-
7199.

SUPPLEMENTARY INFORMATION:

Background

    The standards of this TSO will apply to all APUs used for any new 
application submitted after the effective date of this TSO. APUs 
currently approved under TSO-C77 or TSO-C77a authorization may continue 
to be manufactured under the provisions of their original approval. 
However, under Sec. 21.611(b) of the Federal Aviation Regulations, any 
major design change to an APU previously approved under TSO-C77 or TSO-
C77a would require a new authorization under this TSO. The general 
layout of this document complies with the updated TSO format.

How To Obtain Copies

    A copy of the TSO-C77b may be obtained via Internet (http:/
www.faa.gov/avr/air/air100/100home.htm) or by request from the office 
listed under FOR FURTHER INFORMATION CONTACT.

    Issued in Burlington, Massachusetts on December 20, 2000.
David A. Downey,
Assistant Manager, Engine and Propeller Directorate Aircraft 
Certification Service.
[FR Doc. 01-1858 Filed 1-19-01; 8:45 am]
BILLING CODE 4910-13-M