[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: 2012-21633]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Technical Standard Order (TSO)-C68a, Airborne Automatic Dead
Reckoning Computer Equipment Utilizing Aircraft Heading and Doppler
Ground Speed and Drift Angle Data (for Air Carrier Aircraft)
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of cancellation of Technical Standard Order (TSO)-C68a,
Airborne Automatic Dead Reckoning Computer Equipment Utilizing Aircraft
Heading and Doppler Ground Speed and Drift Angle Data (for Air Carrier
Aircraft).
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SUMMARY: This notice announces the FAA's cancellation of TSO-C68a. The
effect of the cancelled TSO-C68a will result in no new TSO-C68a design
or production 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
Doppler radar is a semiautomatic self-contained dead reckoning
navigation system (radar sensor plus computer) which is not
continuously dependent on information derived from ground based or
external aids. The system employs radar signals to detect and measure
ground speed and drift angle, using the aircraft compass system as its
directional reference. Doppler is less accurate than Inertial
Navigation System (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-C68a systems obsolete. The FAA has no
record of any applications for TSO-C68a since it was published in 1983.
Given the obsolescence of the equipment, and the lack of industry
interest in TSO-C68a product designs, the FAA is cancelling TSO-C68a.
Comments
Request for comments of our proposed cancellation of TSO-C68a as
published in 77 FR 37733, June 22, 2012, produced no comments.
Conclusion
TSO-C68a 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. 2012-21633 Filed 8-31-12; 8:45 am]
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