[Federal Register Volume 60, Number 103 (Tuesday, May 30, 1995)]
[Notices]
[Pages 28200-28201]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-13132]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Airborne Windshear Warning and Escape Guidance Systems for
Transport Airplanes
AGENCY: Federal Aviation Administration, DOD.
ACTION: Notice of availability.
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SUMMARY: This notice announces the availability of and requests
comments on a proposed technical standard order (TSO) pertaining to
airborne windshear warning and escape guidance systems for transport
airplanes. The proposed TSO prescribes the minimum performance
standards that airborne windshear warning and escape guidance systems
for transport airplanes must meet to be identified with the marking
``TSO-C117a.''.
DATES: Comments must identify the TSO file number and be received on or
before August 31, 1995.
ADDRESSES: Send all comments on the proposed technical standard order
to: Technical Analysis Branch, AIR-120, [[Page 28201]] Aircraft
Engineering Division, Aircraft Certification Service--File No. TSO-
C117a, Federal Aviation Administration (FAA), 800 Independence Avenue,
SW., Washington, DC 20591. Or deliver comments to: Federal Aviation
Administration, Room 804, 800 Independence Avenue, SW., Washington, DC
20591.
FOR FURTHER INFORMATION CONTACT: Ms. Bobbie J. Smith, Technical
Programs and Continued Airworthiness Branch, AIR-120, Aircraft
Engineering Division, Aircraft Certification Service, Federal Aviation
Administration, 800 Independence Avenue, SW., Washington, DC 20591,
Telephone (202) 267-9546.
Comments Invited
Interested persons are invited to comment on the proposed TSO
listed in this notice by submitting such written data, views, or
arguments as they desire to the above specified address. Comments
received on the proposed technical standard order may be examined,
before and after the comment closing date, in Room 804, FAA
Headquarters Building (FOB-10A), 800 Independence Avenue, SW.,
Washington, DC 20591, weekdays except Federal holidays, between 8:30
a.m., and 4:30 p.m. All communications received on or before the
closing date for comments specified above will be considered by the
Director of the Aircraft Certification Service before issuing the final
TSO.
Background
Revised TSO-C117a, Airborne Windshear Warning and Escape Guidance
Systems for Transport Airplanes, requires the applicant to show by
analysis, or other suitable means, that the system threshold is above a
point at which nuisance warnings would be objectionable under
conditions of severe turbulence, or aircraft change of configuration,
i.e. flaps and/or gear retraction. If electronics techniques are used
to reduced nuisance warnings by turbulence or aircraft configuration
change, it must be shown that the system response to windshear
detection is acceptable.
A Douglas DC-9-31 airplane crashed while executing a missed-
approach following an instrument landing system approach. The NTSB
report identifies the probable contriving factor for the missed-
detection of the presence of a wind shear in the flight path was a
warning delay designed into the wind shear detection system. This delay
of warning was designed to reduce nuisance warnings from severe
turbulence or aircraft configuration change, i.e., change of flap
setting. This TSO revision will require test to demonstrate that wind
shear detection is within acceptable limits.
How To Obtain Copies
A copy of the proposed TSO-C117a may be obtained by contacting the
individual listed under ``For Further Information Contact.''
Issued in Washington, DC, on May 23, 1995.
John K. McGrath,
Manager, Aircraft Engineering Division, Aircraft Certification Service.
[FR Doc. 95-13132 Filed 5-26-95; 8:45 am]
BILLING CODE 4910-13-M
