Federal Register / Vol. 60, No. 74 / Tuesday, April 18, 1995 / Notices 19443

the subject of the AC, and submit

comments in duplicate to the address

specified above. All communications

received on or before the closing date

for comments will be considered by the

Engine and Propeller Directorate,

Aircraft Certification Service before

issuance of the final AC.

Background

The AC is on the subject of engine

vibration tests and surveys, and was

identified as one where differences

existed between the Joint Aviation

Requirements—Engines, and part 33 of

the Federal Aviation Regulations. A

study group composed of

representatives of the Federal Aviation

Administration, the Joint Aviation

Authorities. Transport Canada and

industry worked to produce a set of

improved and harmonized requirements

that was subsequently incorporated into

part 33 of the FAR. This AC is intended

to provide guidance in implementing

these new harmonzied requirements

during certification.

These requirements have been

published as a notice of proposed

rulemaking in the Federal Register on

March 16, 1995.

This advisory circular, published

under the authority granted to the

Administrator by 49 U.S.C. 106(g), 49

U.S.C. App. 1354(a), 1421 and 1423,

provides guidance for these proposed

requirements,

Issued in Burlington, Massachusetts, on

April 7, 1995.

James C. Jones,

Acting Manager, Engine and Propeller

Directorate, Aircraft Certification Service.

[FR Doc. 95–9503 Filed 4–17–95; 8:45 am]

BILLING CODE 4910–13–M

Airborne Weather Radar With ForwardLooking Windshear Capability

AGENCY: Federal Aviation

Administration.

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 weather

radar with forward-looking windshear

capability. The proposed TSO

prescribes the minimum performance

standards that airborne weather radar

with forward-looking windshear

capability must meet to be identified

with the marking ‘‘TSO–C134.’’

DATES: Comments must identify the

TSO file number and be received on or

before July 20, 1995.

ADDRESSES: Send all comments on the

proposed technical standard order to:

Technical Program and Continued

Airworthiness Branch, AIR–120,

Aircraft Engineering Division, Aircraft

Certification Service—File No. TSO–

C134, 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 Program

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

This is a new TSO that sets forth

minimum operational performance

standards for airborne weather radar

with forward-looking windshear

detection capability.

For windshear detection, the airborne

radar equipment must detect areas

containing windshear activity. It must

be capable of correlating and generating

appropriate alerts based on F factor.

This output must be clear, automatic,

concise and distinct to allow for rapid

pilot interpretation. The selection of the

windshear detection mode must be done

automatically during takeoff and

landing phases of flight.

This TSO contains standards for

weather detection and ground mapping.

In the case of weather detection, the

airborne radar equipment must detect

and display echoes from precipitation in

a way that will allow flight crew

analysis of probable turbulent areas

ahead. In the case of ground mapping,

the airborne radar equipment must be

able to detect and display echoes from

the surface of the earth to allow in-flight

analysis.

How to Obtain Copies

A copy of the proposed TSO–C134

may be obtained by contacting FOR

FURTHER INFORMATION CONTACT. Copies

of RTCA Document No. DO–220,

‘‘Minimum Operational Performance

Standards for Airborne Weather Radar

with Forward-Looking Windshear

Capability,’’ may be purchased from the

RTCA Inc., 1140 Connecticut Avenue,

NW., Suite 1020, Washington, DC

20036.

Issued in Washington, DC, on April 12,

1995.

John K. McGrath,

Manager, Aircraft Engineering Division

Aircraft Certification Service.

[FR Doc. 95–9502 Filed 4–17–95; 8:45 am]

BILLING CODE 4910–13–M

Aircraft Flight Recorder and Cockpit

Voice Recorder

AGENCY: Federal Aviation

Administration (FAA), DOT.

ACTION: Notice of Cancellation of

Technical Standard Orders (TSO’s) C51a

and C84.

SUMMARY: This notice cancels TSO–

C51a, Aircraft Flight Recorder and TSO–

C84, Cockpit Voice Recorder. TSO–C51a

prescribes the minimum performance

standards that aircraft flight recorders

were required to be identified with

marking ‘‘TSO–C51a,’’ dated January 6,

1966. TSO–C84 prescribes the minimum

performance standards that cockpit

voice recorders (CVR) were required to

be identified with marking ‘‘TSO–C84.’’

This cancellation will ensure that future

flight recorders and cockpit voice

recorders are produced under TSO–

C123a, Cockpit Voice Recorder System,

and TSO–C124a, Flight Data Recorder

Systems.

EFFECTIVE DATE: May 18, 1995.

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.

SUPPLEMENTARY INFORMATION:

Background

The National Transportation Safety

Board reported that seven flight recorder

media destroyed by postimpact fire in