[Federal Register Volume 77, Number 171 (Tuesday, September 4, 2012)]
[Notices]
[Page 53962]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-21632]
[[Page 53962]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Technical Standard Order (TSO)-C65a, Airborne Doppler Radar
Ground Speed and/or Drift Angle Measuring Equipment (For Air Carrier
Aircraft)
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of cancellation of Technical Standard Order (TSO)-C65a,
Airborne Doppler Radar Ground Speed and/or Drift Angle Measuring
Equipment (For Air Carrier Aircraft).
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SUMMARY: This notice announces the FAA's cancellation of TSO-C65a. The
effect of the cancelled TSO will result in no new TSO-C65a design or
production approvals. However, cancellation will not affect current
production of articles with an existing TSO authorization (TSOA).
Articles produced under an existing TSOA can still be installed per the
existing airworthiness approvals.
FOR FURTHER INFORMATION CONTACT: Mr. Albert Sayadian, AIR-130, Federal
Aviation Administration, 470 L'Enfant Plaza, Suite 4102, Washington, DC
20024. Telephone (202) 385-4652, fax (202) 385-4651, email to:
[email protected].
SUPPLEMENTARY INFORMATION:
Background
The Doppler radar ground speed and/or drift angle measuring
equipment described by this TSO was used to provide inputs to
semiautomatic self-contained dead reckoning navigation systems which
were not continuously dependent on information derived from ground
based or external navigation aids. The system employed radar signals to
detect and measure ground speed and drift angle, using the aircraft
compass system as its directional reference. This approach is less
accurate than Inertial Navigation Systems (INS), and the use of an
external reference is required for periodic updates if acceptable
position accuracy is to be achieved on long range flights. Use of INS
and Global Positioning System (GPS) has rendered TSO-C65a Doppler
sensor equipment that provides inputs to dead reckoning navigation
systems obsolete.
On August 18, 1983, the FAA published TSO-C65a. The FAA has no
record of any TSO-C65a applications dating back to 1990. Our research
indicates there are no new TSO-C65a applications in progress, and there
are no authorized manufacturers manufacturing, advertising, or selling
TSO-C65a compliant equipment. Given the obsolescence of the equipment,
and the lack of industry interest in new TSO-C65a product design, the
FAA is cancelling TSO-C65a.
Comments
Request for comments of our proposed cancellation of TSO-C65a as
published in 77 FR 37470, June 21, 2012, produced no comments.
Conclusion
TSO-C65a is cancelled effective February 1, 2013.
Issued in Washington, DC, on August 28, 2012.
Susan J.M. Cabler,
Assistant Manager, Aircraft Engineering Division, Aircraft
Certification Service.
[FR Doc. 2012-21632 Filed 8-31-12; 8:45 am]
BILLING CODE 4910-13-P