5570 Federal Register / Vol. 71, No. 21 / Wednesday, February 1, 2006 / Notices 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

[Docket No. FAA–2006–23658] 

Proposed Advisory Circular (AC) 20– 

HIRF, The Certification of Aircraft 

Electrical and Electronic Systems for 

Operation in the High Intensity 

Radiated Field (HIRF) Environment 

AGENCY: Federal Aviation 

Administration (DOT). 

ACTION: Notice of availability and 

request for public comment. 

SUMMARY: This notice announces the 

availability of, and requests comments 

on proposed Advisory Circular (AC) 20– 

HIRF, The Certification of Aircraft 

Electrical and Electronic Systems for 

Operation in the High Intensity 

Radiated Field (HIRF) Environment. 

This proposed AC provides information 

and guidance concerning an acceptable 

means, but not the only means, of 

showing compliance with the High 

Intensity Radiated Field (HIRF) Notice 

of Proposed Rulemaking (NPRM) 

published in the Federal Register on 

February 1, 2006, regarding the 

operation of electrical and electronic 

systems on an aircraft when the aircraft 

is exposed to an external HIRF 

environment. 

DATES: Comments must be received on 

or before May 2, 2006. 

ADDRESSES: You may send comments 

identified by Docket Number FAA– 

2006–23658 using any of the following 

methods: 

1. DOT Docket Web site: Go to http:// 

dms.dot.gov and follow the instructions 

for sending your comments 

electronically; 

2. Mail: Docket Management Facility; 

U.S. Department of Transportation, 400 

Seventh Street, SW., Nassif Building, 

Room PL–401, Washington, DC 20590– 

001; 

3. Fax: 1–202–493–2251; or 

4. Hand Delivery: Room PL–401 on 

the plaza level of the Nassif Building, 

400 Seventh Street, SW., Washington, 

DC, between 9 a.m. and 5 p.m., Monday 

through Friday, except Federal holidays. 

FOR FURTHER INFORMATION CONTACT: 

Richard E. Jennings, Aircraft 

Certification Service, Aircraft 

Engineering Division, AIR–130, Federal 

Aviation Administration, c/o Atlanta 

Aircraft Certification Office, 1895 

Phoenix Blvd., Suite 450, Atlanta, GA 

30349. Telephone (770) 703–6090. Or, 

via e-mail at: Richard.Jennings@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

Interested persons are invited to 

comment on the proposed AC 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 AC 

may be examined, before and after the 

comment closing date, in Room PL–401 

on the plaza level of the Nassif Building, 

400 Seventh Street, SW., Washington, 

DC, between 9 a.m. and 5 p.m. Monday 

through Friday, except Federal holidays, 

or on the DOT DMS Web site http:// 

dms.dot.gov at any time. All 

communications received on or before 

the closing date will be considered by 

the Manager of the Aircraft Engineering 

Division, Aircraft Certification Service, 

before issuing the final Advisory 

Circular. 

Background 

The external HIRF environment exists 

because of the transmission of 

electromagnetic radio frequency (RF) 

energy from radar, radio, television, and 

other ground-based, shipborne, or 

airborne RF transmitters. Because of the 

vulnerability of aircraft electrical and 

electronic systems to interference from 

the electromagnetic RF energy generated 

by these transmitters, the FAA proposes 

to add airworthiness standards to 

protect these systems from this external 

HIRF environment. This proposed AC 

provides designers, manufacturers, and 

installers, with general information and 

acceptable means to show compliance 

with the FAA’s proposed HIRF 

airworthiness regulations. 

How To Obtain Copies 

You may get a copy of proposed AC 

20–HIRF from the Internet at: http:// 

www.faa.gov/aircraft/draft_docs/. See 

section entitled FOR FURTHER

INFORMATION CONTACT for the complete 

address if requesting a copy by mail. 

Issued in Washington, DC, on January 25, 

2006. 

Susan J. M. Cabler, 

Acting Manager, Aircraft Engineering 

Division, Aircraft Certification Service. 

[FR Doc. 06–897 Filed 1–31–06; 8:45 am] 

BILLING CODE 4910–13–P 


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