[Federal Register Volume 69, Number 120 (Wednesday, June 23, 2004)]
[Notices]
[Pages 35126-35127]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-14208]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Technical Standard Order--C158, Aeronautical Mobile High 
Frequency Data Link (HFDL) Equipment

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of availability and requests for public comment.

-----------------------------------------------------------------------

SUMMARY: This notice announces the availability of and requests for 
comments on the proposed Technical Standard Order (TSO)-C158, 
Aeronautical Mobile High Frequency Data Link (HFDL) Equipment. The 
proposed TSO tells manufacturers seeking TSO authorization or letter of 
design approval what minimum performance standards (MPS) their HFDL 
equipment must first meet for approval and identification with the 
applicable TSO markings.

DATES: Submit comments on of before. July 23, 2004.

ADDRESSES: Send all comments on the proposed TSO-C158 to: Federal 
Aviation Administration, Aircraft Certification Service, Aircraft 
Engineering Division, Avionic Systems Branch, AIR-130, Room 815, 800 
Independence Avenue, SW., Washington, DC 20591. ATTN: Mr. David W. 
Robinson, AIR-130. You may deliver comments to: Federal Aviation 
Administration, Room 815, 800 Independence Avenue, SW., Washington, DC 
20591.

FOR FURTHER INFORMATION CONTACT: Mr. David W. Robinson, AIR-130, Room 
815, Federal Aviation Administration, Aircraft Certification Service, 
Aircraft Engineering Division, 800 Independence Avenue, SW., 
Washington, DC 20591, Telephone (202) 385-4650, FAX: (202) 385-4651, or 
e-mail: [email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    You are invited to comment on the proposed TSO identified in this 
notice by submitting written data, views, or arguments to the address 
listed above. Your comments should identify ``Comments to proposed TSO-
C158.'' You may examine all comments revised on the proposed TSO before 
and after the comment closing date at the Federal Aviation 
Administration, Room 815, 800 Independence Avenue, SW., Washington, DC 
20591, weekdays except Federal holidays, between 8:30 a.m. and 4:30 
p.m. The Director of the Aircraft Certification Service will consider 
all communications received on or before the closing date before 
issuing the final TSO.

Background

    This proposed TSO-C158 contains minimum performance standards for 
communications systems utilizing High Frequency Data Link (HFDL) 
equipment for the air-ground communications sub network in an 
Aeronautical Telecommunications Network (ATN) environment. This 
proposed TSO is for manufacturers applying for a TSO authorization or 
letter of design approval. In it, we (the Federal Aviation 
Administration) tell you what minimum performance standards (MPS) your 
Aeronautical Mobile Frequency Data Link (HFDL) communications equipment 
must meet for approval.

How To Obtain Copies

    You may get a copy of the proposed TSO from the Internet at: http://av-info.faa.gov/tso/Tsopro/Proposed.htm.

[[Page 35127]]

You may also request a copy from Mr. David W. Robinson. See the section 
entitled For Further Information Contact for the complete address.

    Issued in Washington, DC, on June 16, 2004.
Susan J.M. Cabler,
Acting Manager, Aircraft Engineering Division, Aircraft Certification 
Service.
[FR Doc. 04-14208 Filed 6-22-04; 8:45 am]
BILLING CODE 4910-13-M