[Federal Register Volume 67, Number 247 (Tuesday, December 24, 2002)]
[Notices]
[Pages 78562-78563]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-32417]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Technical Standard Order (TSO)-C151b, Terrain Awareness and 
Warning System

AGENCY: Federal Aviation Administration (DOT).

ACTION: Availability of final TSO document.

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SUMMARY: This notice announces the availability of TSO-C151b. The final 
TSO tells persons seeking a TSO authorization or letter of design 
approval what minimum performance standard (MPS) their Terrain 
Awareness and Warning System must meet to obtain and be identified with 
TSO-C151b Class A, B, or C markings.

DATES: This TSO is effective on December 17, 2002.

FOR FURTHER INFORMATION CONTACT: Ms. Bobbie J. Smith, Program Support 
Specialist, Federal Aviation Administration, Aircraft Certification 
Service, Aircraft Engineering Division, Technical Programs & Continued 
Airworthiness Branch, AIR-120, Room 815, 800 Independence Avenue, SW., 
Washington, DC 20591, Telephone (202) 267-9546.

SUPPLEMENTARY INFORMATION: This TSO is effective for new applications 
submitted after the effective date of this TSO. All prior revisions to 
this TSO are no longer effective and, in general, applications will not 
be accepted after the effective date of this TSO. However, applications 
submitted against the previous versions of this TSO may be accepted up 
to six months after the effective date of this TSO, in cases where we 
know the applicant was working against the earlier MPS before the new 
change became effective. Terrain Awareness and Warning Systems approved 
under a previous TSO authorization may continue to be manufactured 
under the provisions of their original approval, as specified in title 
14 of the Code of Federal Regulations (14 CFR) 21.603(b). However, 
major design changes to TAWS equipment approved under previous versions 
of this TSO requires a new authorization under this TSO, per 14 CFR 
21.611(b).
    This is a revised TSO that sets forth minimum operational 
performance standards that a Terrain Awareness and Warning System 
(TAWS) equipment must meet to be identified with the TSO-C151b Class A, 
B, or C marking. This revision adds the requirements for a Class C 
designation.

[[Page 78563]]

    The standards of this TSO apply to equipment intended to provide 
pilots and flight crews with both aural and visual alerts to aid in 
preventing an inadvertent controlled flight into terrain (CFIT) 
accident. Class A and B TAWS equipment are required by 14 CFR parts 91, 
135, and 121. Class C equipment is intended for voluntary installations 
on aircraft not covered by the TAWS requirements in 14 CFR parts 91, 
135, and 121.

How To Obtain Copies

    A copy of the final TSO may be obtained via the internet at, http://www.faa.gov/certification/aircraft/TSOA.htm, or by contacting the 
person listed in the section titled FOR FURTHER INFORMATION CONTACT.

    Issued in Washington, DC, on December 19, 2002.
David W. Hempe,
Manager, Aircraft Engineering Division, Aircraft Certification Service.
[FR Doc. 02-32417 Filed 12-23-02; 8:45 am]
BILLING CODE 4910-13-M