[Federal Register Volume 69, Number 98 (Thursday, May 20, 2004)]
[Notices]
[Pages 29159-29160]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-11453]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Technical Standard Order--C170, High Frequency (HF) Radio 
Communications Transceiver Equipment Operating Within the Radio 
Frequency Range 1.5 to 30.00 Megahertz

AGENCY: Federal Aviation Administration (DOT).

ACTION: Notice of availability and requests for public comment.

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SUMMARY: This notice announces the availability of and request comments 
on a proposed Technical Standard Order (TSO)-C170, HF Radio 
Communications Transceiver Equipment Operating within the Radio 
Frequency Range 1.5 to 30.00 Megahertz. The proposed TSO tells 
manufacturers seeking TSO authorization or letter of design approval 
what minimum performance standards (MPS) their HF radio communications 
transceiver equipment must first meet for approval and identification 
with the applicable TSO markings.

DATES: Submit comments on or before June 18, 2004.

ADDRESSES: Send all comments on the proposed TSO-C170 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. Moin 
Abulhosn, AIR-130. You may deliver comments to: Federal Aviation 
Administration, Room 815, 800 Independence Avenue, SW., Washington, DC 
20591.

FOR FURTHER INFORMATION CONTACT: Mr. Moin Abulhosn, AIR-130, Room 815 
Federal Aviation Administration, Aircraft Certification Service, 
Aircraft Engineering Division, 800 Independence Avenue, SW., 
Washington, DC 20591, Telephone (202) 385-4648, 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-
C170''. 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-C170 combines into one TSO the proposed minimum 
performance standards of TSO-C31d, High Frequency Radio Communications 
Transmitting Equipment Operating Within the Radio Frequency Range of 
1.5 to 30.00 Megahertz and the proposed TSO-C32d, High Frequency Radio 
Communications Receiving Equipment Operating Within the Radio Frequency 
Range of 1.5 to 30.00 Megahertz. Furthermore TSO-C170 conforms to the 
latest TSO boilerplate wording to include a functionality definition 
used to specify the Failure Hazard Classification unique to HF radio 
communication transceiver equipment. This proposed TSO also changes the 
technical requirements necessary to meet the MPS such as:
    a. The environmental conditions and test procedures specified in 
TRCA/DO-160D, Environmental Conditions and Test Procedures for Airborne 
Equipment, dated July 29, 1997, Change 1, Change 2 and Change 3; and
    b. The software development guidelines specified in TRCA/DO-189B, 
Software Considerations in Airborne Systems and Equipment 
Certification, dated December 1, 1992.
    The basic TSO provides minimum operational performance standards 
for HF radio communications transceiver equipment that should be 
helpful to users, designers, manufacturers, and installers of HF radio 
communications transceiver equipment.

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. You may also request a copy 
from Mr. Moin Abulhosn. See the section entitled

[[Page 29160]]

FOR FURTHER INFORMATION CONTACT for the complete address.

    Issued in Washington, DC, on May 17, 2004.
Susan J.M. Cabler,
Acting Manager, Aircraft Engineering Division, Aircraft Certification 
Service.
[FR Doc. 04-11453 Filed 5-19-04; 8:45 am]
BILLING CODE 4910-13-M