[Federal Register Volume 60, Number 85 (Wednesday, May 3, 1995)]
[Notices]
[Pages 21846-21847]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-10766]



-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration


Airborne Ground Proximity Warning Equipment; Proposed Technical 
Standard Order

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of availability for public comment.

-----------------------------------------------------------------------

SUMMARY: This notice announces the availability of and request comments 
on a proposed technical standard order (TSO) pertaining to airborne 
ground proximity equipment. The proposed TSO prescribes the minimum 
performance standards that airborne ground proximity equipment must 
meet to be identified with the marking ``TSO-C92c.''.

DATES: Comments must identify the TSO file number and be received on or 
before August 4, 1995.

ADDRESSES: Send all comments on the proposed technical standard order 
to: Technical Programs and Continued Airworthiness Branch, AIR-120, 
Aircraft Engineering Division, Aircraft Certification Service--File No. 
TSO-C92c, Federal Aviation Administration, 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

    The FAA has reviewed TSO-C92b and the referenced RTCA, Inc., 
Document No. DO-161A and finds that there is a need to revise this TSO 
to address NTSB Safety Recommendations A-92-39 through A-92-42 and to 
update the computer software and environmental requirements.
    Proposed TSO-C92c would add two new requirements: Each aural 
warning shall identify the reason for a GPWS warning, and each approved 
equipment would include airspeed in the logic that determines GPWS 
warning times. These requirements should satisfy Safety recommendations 
A-92-39 and A-92-40. The proposal adds a new paragraph which will allow 
added features, such as altitude callouts during nonprecision 
approaches and warnings based on airport location and aircraft position 
data. This paragraph addresses Safety Recommendations A-92-41 and A-92-
42. Additionally, the FAA proposes to include RTCA DO-178B as the 
computer software requirement (none specified in TSO-C92b) and to 
update [[Page 21847]] the environmental standard with RTCA DO-160C.

How To Obtain Copies

    A copy of the proposed TSO-C92c may be obtained by contacting ``For 
Further Information Contact.'' Copies of RTCA Document No. DO-161A, 
``Minimum Performance Standards for Airborne Ground Proximity Warning 
Equipment,'' may be purchased from the RTCA Inc., 1140 Connecticut 
Avenue, NW., Suite 1020, Washington, DC 20036.

    Issued in Washington, DC, on April 18, 1995.
Abbas A. Rizvi,
Acting Manager, Aircraft Engineering Division, Aircraft Certification 
Service.
[FR Doc. 95-10766 Filed 5-2-95; 8:45 am]
BILLING CODE 4910-13-M