[Federal Register Volume 65, Number 24 (Friday, February 4, 2000)]
[Notices]
[Page 5720]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 00-2564]



[[Page 5720]]

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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 proposed Technical Standard Order 
and request for public comment.

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

DATES:  Comments must identify the TSO file number and be received on 
or before May 4, 2000.

ADDRESSES:  Send all comments on the proposed TSO to the Federal 
Aviation Administration, Attn: Engine and Propeller Standards Staff, 
ANE-110, Engine and Propeller Directorate, Aircraft Certification 
Service, 12 New England Executive Park, Burlington, MA, 01803-5299. 
Comments must identify the TSO file number.

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:

Comments Invited

    A copy of the draft TSO may be obtained by contacting the person 
named under FOR FURTHER INFORMATION CONTACT. Interested persons are 
invited to comment on the proposed TSO, and to submit such written 
data, views, or arguments as they desire. Commenters must identify the 
TSO file number, and submit comments to the address specified above. 
All communications received on or before the closing date for comments 
will be considered by the Engine and Propeller Directorate, Aircraft 
Certification Service, before issuance of the final TSO.

Background

    The standards of this TSO would 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 proposed TSO-C77b may be obtained via Internet 
(http:/www.faa.gov/avr/air/air100/100home.htm) or on request from the 
office listed under FOR FURTHER INFORMATION CONTACT.

    Issued in Burlington, MA on January 7, 2000.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 00-2564 Filed 2-3-00; 8:45 am]
BILLING CODE 4910-13-M