57730 Federal Register / Vol. 70, No. 191 / Tuesday, October 4, 2005 / Rules and Regulations 

strength components from the table are 

to be demonstrated. 

Frequency 

Field strength 

(volts per meter) 

Peak Average 

10 kHz—100 kHz ..... 50 50 

100 kHz–500 kHz ..... 50 50 

500 kHz–2 MHz ........ 50 50 

2 MHz–30 MHz ......... 100 100 

30 MHz–70 MHz ....... 50 50 

70 MHz–100 MHz ..... 50 50 

100 MHz–200 MHz ... 100 100 

200 MHz–400 MHz ... 100 100 

400 MHz–700 MHz ... 700 50 

700 MHz–1 GHz ....... 700 100 

1 GHz–2 GHz ........... 2000 200 

2 GHz–4 GHz ........... 3000 200 

4 GHz–6 GHz ........... 3000 200 

6 GHz–8 GHz ........... 1000 200 

8 GHz–12 GHz ......... 3000 300 

12 GHz–18 GHz ....... 2000 200 

18 GHz–40 GHz ....... 600 200 

The field strengths are expressed in terms 

of peak of the root-mean-square (rms) over 

the complete modulation period. 

The threat levels identified above are 

the result of an FAA review of existing 

studies on the subject of HIRF, in light 

of the ongoing work of the 

Electromagnetic Effects Harmonization 

Working Group of the Aviation 

Rulemaking Advisory Committee. 

Applicability 

As discussed above, these special 

conditions are applicable to Raytheon 

Model BH125 Series 400A and 600A 

airplanes, modified by Flight Test 

Associates, Inc. Should Flight Test 

Associates, Inc., apply at a later date for 

a change to the type certificate to 

include another model incorporating the 

same novel or unusual design feature, 

these special conditions would apply to 

that model as well as under the 

provisions of 14 CFR 21.101. 

Conclusion 

This action affects only certain design 

features on the Raytheon Model BH125 

Series 400A and 600A airplanes 

modified by Flight Test Associates, Inc. 

It is not a rule of general applicability 

and affects only the applicant who 

applied to the FAA for approval of these 

features on the airplane. 

The substance of the special 

conditions for these airplanes has been 

subjected to the notice and comment 

procedure in several prior instances and 

has been derived without substantive 

change from those previously issued. 

Because a delay would significantly 

affect the certification of the airplane, 

which is imminent, the FAA has 

determined that prior public notice and 

comment are unnecessary and 

impracticable, and good cause exists for 

adopting these special conditions 

immediately. The FAA is requesting 

comments to allow interested persons to 

submit views that may not have been 

submitted in response to the prior 

opportunities for comment described 

above. 

List of Subjects in 14 CFR Part 25 

Aircraft, Aviation safety, Reporting 

and record keeping requirements. 

The authority citation for these 

special conditions is as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701, 

44702, 44704. 

The Special Conditions 

Accordingly, pursuant to the 

authority delegated to me by the 

Administrator, the following special 

conditions are issued as part of the 

supplemental type certification basis for 

the modified Raytheon Model BH125 

Series 400A and 600A airplanes, 

modified by Flight Test Associates, Inc.: 

1. Protection from Unwanted Effects 

of High-Intensity Radiated Fields 

(HIRF). Each electrical and electronic 

system that performs critical functions 

must be designed and installed to 

ensure that the operation and 

operational capability of these systems 

to perform critical functions are not 

adversely affected when the airplane is 

exposed to high intensity radiated 

fields. 

2. For the purpose of these special 

conditions, the following definition 

applies: 

Critical Functions: Functions whose 

failure would contribute to or cause a 

failure condition that would prevent the 

continued safe flight and landing of the 

airplane. 

Issued in Renton, Washington. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 05–19859 Filed 10–3–05; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 25 

[Docket No. NM329; Special Conditions No. 

25–300–SC] 

Special Conditions: Dassault-Aviation 

Mystere-Falcon 50 Airplanes; HighIntensity Radiated Fields (HIRF) 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final special conditions; request 

for comments. 

SUMMARY: These special conditions are 

issued for Dassault-Aviation MystereFalcon 50 airplanes modified by 

Premier Air Center. These modified 

airplanes will have a novel or unusual 

design feature when compared to the 

state of technology envisioned in the 

airworthiness standards for transport 

category airplanes. The modification 

incorporates the installation of 

Universal Avionics EFI–890 Electronic 

Flight Displays and Rockwell Collins 

AHS–3000A Attitude Heading 

Reference Systems (AHRS) that perform 

critical functions. The applicable 

airworthiness regulations do not contain 

adequate or appropriate safety standards 

for the protection of these systems from 

the effects of high-intensity radiated 

fields (HIRF). These special conditions 

contain the additional safety standards 

that the Administrator considers 

necessary to establish a level of safety 

equivalent to that established by the 

existing airworthiness standards. 

DATES: The effective date of these 

special conditions is September 23, 

2005. Comments must be received on or 

before November 3, 2005. 

ADDRESSES: Comments on these special 

conditions may be mailed in duplicate 

to: Federal Aviation Administration, 

Transport Airplane Directorate, 

Attention: Rules Docket (ANM–113), 

Docket No. NM329, 1601 Lind Avenue 

SW., Renton, Washington 98055–4056; 

or delivered in duplicate to the 

Transport Airplane Directorate at the 

above address. All comments must be 

marked: Docket No. NM329. 

FOR FURTHER INFORMATION CONTACT: Greg 

Dunn, FAA, Airplane and Flight Crew 

Interface Branch, ANM–111, Transport 

Airplane Directorate, Aircraft 

Certification Service, 1601 Lind Avenue 

SW., Renton, Washington 98055–4056; 

telephone (425) 227–2799; facsimile 

(425) 227–1320. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA has determined that notice 

and opportunity for prior public 

comment is impracticable because these 

procedures would significantly delay 

certification of the airplane and thus 

delivery of the affected aircraft. In 

addition, the substance of these special 

conditions has been subject to the 

public comment process in several prior 

instances with no substantive comments 

received. The FAA therefore finds that 

good cause exists for making these 

special conditions effective upon 

issuance; however, the FAA invites 

interested persons to participate in this 

rulemaking by submitting written 

comments, data, or views. The most 

Federal Register / Vol. 70, No. 191 / Tuesday, October 4, 2005 / Rules and Regulations 57731 

helpful comments reference a specific 

portion of the special conditions, 

explain the reason for any 

recommended change, and include 

supporting data. We ask that you send 

us two copies of written comments. 

We will file in the docket all 

comments we receive, as well as a 

report summarizing each substantive 

public contact with FAA personnel 

concerning these special conditions. 

The docket is available for public 

inspection before and after the comment 

closing date. If you wish to review the 

docket in person, go to the address in 

the ADDRESSES section of this preamble 

between 7:30 a.m. and 4:00 p.m., 

Monday through Friday, except Federal 

holidays. 

We will consider all comments we 

receive on or before the closing date for 

comments. We will consider comments 

filed late if it is possible to do so 

without incurring expense or delay. We 

may change these special conditions 

based on the comments we receive. 

If you want the FAA to acknowledge 

receipt of your comments on these 

special conditions, include with your 

comments a pre-addressed, stamped 

postcard on which the docket number 

appears. We will stamp the date on the 

postcard and mail it back to you. 

Background 

On May 26, 2005, Premier Air Center, 

18 Terminal Drive, East Alton, Illinois, 

62024, applied for a supplemental type 

certificate (STC) to modify DassaultAviation Mystere-Falcon 50 airplanes. 

This model is currently approved under 

Type Certificate No. A46EU. The 

Dassault-Aviation Mystere-Falcon 50 

airplanes are transport category 

airplanes powered by three Allied 

Signal TFE–731–3–1C turbine engines 

with maximum takeoff weights of up to 

40,780 pounds. These airplanes operate 

with a 2-pilot crew and can seat up to 

19 passengers. The modification 

incorporates the installation of 

Universal Avionics EFI–890 Electronic 

Flight Displays and Rockwell Collins 

AHS–3000A Attitude Heading 

Reference Systems (AHRS). These 

systems perform critical functions 

whose failure would prevent the 

continued safe flight and landing of the 

airplane. The display and attitude 

systems that will be installed in this 

airplane have the potential to be 

vulnerable to high-intensity radiated 

fields (HIRF) external to the airplane. 

Type Certification Basis 

Under the provisions of 14 CFR 

21.101, Premier Air Center must show 

that the Dassault-Aviation MystereFalcon 50 airplanes, as changed, 

continue to meet the applicable 

provisions of the regulations 

incorporated by reference in Type 

Certificate No. A46EU, or the applicable 

regulations in effect on the date of 

application for the change. The 

regulations incorporated by reference in 

the type certificate are commonly 

referred to as the ‘‘original type 

certification basis.’’ The certification 

basis for Dassault-Aviation MystereFalcon 50 airplanes includes applicable 

sections of 14 CFR part 25 as amended 

by Amendment 25–1 through 

Amendment 25–34, Special Conditions 

No. 25–86–EU–24, and SFAR 27 as 

amended by Amendment 27–1. In 

addition, the certification basis includes 

certain special conditions, exemptions, 

equivalent levels of safety, or later 

amended sections of the applicable part 

25 that are not relevant to these special 

conditions. 

If the Administrator finds that the 

applicable airworthiness regulations 

(i.e., part 25, as amended) do not 

contain adequate or appropriate safety 

standards for Dassault-Aviation 

Mystere-Falcon 50 airplanes because of 

a novel or unusual design feature, 

special conditions are prescribed under 

the provisions of § 21.16. 

In addition to the applicable 

airworthiness regulations and special 

conditions, the Dassault-Aviation 

Mystere-Falcon 50 airplanes must 

comply with the fuel vent and exhaust 

emission requirements of 14 CFR part 

34 and the noise certification 

requirements of 14 CFR part 36. 

Special conditions, as defined in 14 

CFR 11.19, are issued in accordance 

with § 11.38 and become part of the type 

certification basis in accordance with 

§ 21.101. 

Special conditions are initially 

applicable to the model for which they 

are issued. Should Premier Air Center 

apply at a later date for a STC to modify 

any other model included on Type 

Certificate No. A46EU to incorporate the 

same or similar novel or unusual design 

feature, these special conditions would 

also apply to the other model under the 

provisions of § 21.101. 

Novel or Unusual Design Features 

As noted earlier, the DassaultAviation Mystere-Falcon 50 airplanes 

modified by Premier Air Center will 

incorporate Universal Avionics EFI–809 

Electronic Flight Displays and Rockwell 

Collins AHS–3000A AHRS that will 

perform critical functions. These 

systems may be vulnerable to highintensity radiated fields (HIRF) external 

to the airplane. The current 

airworthiness standards of part 25 do 

not contain adequate or appropriate 

safety standards for the protection of 

this equipment from the adverse effects 

of HIRF. Accordingly, this system is 

considered to be a novel or unusual 

design feature. 

Discussion 

There is no specific regulation that 

addresses protection requirements for 

electrical and electronic systems from 

HIRF. Increased power levels from 

ground-based radio transmitters and the 

growing use of sensitive avionics/ 

electronics and electrical systems to 

command and control airplanes have 

made it necessary to provide adequate 

protection. 

To ensure that a level of safety is 

achieved equivalent to that intended by 

the regulations incorporated by 

reference, special conditions are needed 

for the Dassault-Aviation MystereFalcon 50 airplanes modified by 

Premier Air Center. These special 

conditions require that new avionics/ 

electronics and electrical systems that 

perform critical functions be designed 

and installed to preclude component 

damage and interruption of function 

due to both the direct and indirect 

effects of HIRF. 

High-Intensity Radiated Fields (HIRF) 

With the trend toward increased 

power levels from ground-based 

transmitters, and the advent of space 

and satellite communications coupled 

with electronic command and control of 

the airplane, the immunity of critical 

avionics/electronics and electrical 

systems to HIRF must be established. 

It is not possible to precisely define 

the HIRF to which the airplane will be 

exposed in service. There is also 

uncertainty concerning the effectiveness 

of airframe shielding for HIRF. 

Furthermore, coupling of 

electromagnetic energy to cockpitinstalled equipment through the cockpit 

window apertures is undefined. Based 

on surveys and analysis of existing HIRF 

emitters, an adequate level of protection 

exists when compliance with the HIRF 

protection special condition is shown 

with either paragraph 1 or 2 below: 

1. A minimum threat of 100 volts rms 

(root-mean-square) per meter electric 

field strength from 10 KHz to 18 GHz. 

a. The threat must be applied to the 

system elements and their associated 

wiring harnesses without the benefit of 

airframe shielding. 

b. Demonstration of this level of 

protection is established through system 

tests and analysis. 

2. A threat external to the airframe of 

the field strengths identified in the table 

below for the frequency ranges 

indicated. Both peak and average field 

57732 Federal Register / Vol. 70, No. 191 / Tuesday, October 4, 2005 / Rules and Regulations 

strength components from the table are 

to be demonstrated. 

Frequency 

Field strength 

(volts per meter) 

Peak Average 

10 kHz–100 kHz ........... 50 50 

100 kHz–500 kHz ......... 50 50 

500 kHz–2 MHz ............ 50 50 

2 MHz–30 MHz ............. 100 100 

30 MHz–70 MHz ........... 50 50 

70 MHz–100 MHz ......... 50 50 

100 MHz–200 MHz ....... 100 100 

200 MHz–400 MHz ....... 100 100 

400 MHz–700 MHz ....... 700 50 

700 MHz–1 GHz ........... 700 100 

1 GHz–2 GHz ............... 2000 200 

2 GHz–4 GHz ............... 3000 200 

4 GHz–6 GHz ............... 3000 200 

6 GHz–8 GHz ............... 1000 200 

8 GHz–12 GHz ............. 3000 300 

12 GHz–18 GHz ........... 2000 200 

18 GHz–40 GHz ........... 600 200 

The field strengths are expressed in terms 

of peak of the root-mean-square (rms) over 

the complete modulation period. 

The threat levels identified above are 

the result of an FAA review of existing 

studies on the subject of HIRF, in light 

of the ongoing work of the 

Electromagnetic Effects Harmonization 

Working Group of the Aviation 

Rulemaking Advisory Committee. 

Applicability 

As discussed above, these special 

conditions are applicable to DassaultAviation Mystere-Falcon 50 airplanes 

modified by Premier Air Center. Should 

Premier Air Center apply at a later date 

for a STC to modify any other model 

included on Type Certificate No. A46EU 

to incorporate the same or similar novel 

or unusual design feature, these special 

conditions would apply to that model as 

well under the provisions of § 21.101. 

Conclusion 

This action affects only certain novel 

or unusual design features on DassaultAviation Mystere-Falcon 50 airplanes 

modified by Premier Air Center. It is not 

a rule of general applicability and 

affects only the applicant who applied 

to the FAA for approval of these features 

on the airplane. 

The substance of these special 

conditions has been subjected to the 

notice and comment procedure in 

several prior instances and has been 

derived without substantive change 

from those previously issued. Because a 

delay would significantly affect the 

certification of the airplane, which is 

imminent, the FAA has determined that 

prior public notice and comment are 

unnecessary and impracticable, and 

good cause exists for adopting these 

special conditions upon issuance. The 

FAA is requesting comments to allow 

interested persons to submit views that 

may not have been submitted in 

response to the prior opportunities for 

comment described above. 

List of Subjects in 14 CFR Part 25 

Aircraft, Aviation safety, Reporting 

and recordkeeping requirements. 

The authority citation for these 

special conditions is as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701, 

44702, 44704. 

The Special Conditions 

Accordingly, pursuant to the 

authority delegated to me by the 

Administrator, the following special 

conditions are issued as part of the 

supplemental type certification basis for 

the Dassault-Aviation Mystere-Falcon 

50 airplanes modified by Premier Air 

Center. 

1. Protection from Unwanted Effects 

of HIRF. Each electrical and electronic 

system that performs critical functions 

must be designed and installed to 

ensure that the operation and 

operational capability of these systems 

to perform critical functions are not 

adversely affected when the airplane is 

exposed to high-intensity radiated 

fields. 

2. For the purpose of these special 

conditions, the following definition 

applies: Critical Functions: Functions 

whose failure would contribute to or 

cause a failure condition that would 

prevent the continued safe flight and 

landing of the airplane. 

Issued in Renton, Washington. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 05–19860 Filed 10–3–05; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2005–22539; Directorate 

Identifier 2004–NM–08–AD; Amendment 39–

14300; AD 2005–20–07] 

RIN 2120–AA64 

Airworthiness Directives; Airbus Model 

A330–300 Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA adopts a new 

airworthiness directive (AD) for certain 

Airbus Model A330–300 series 

airplanes. This AD requires reinforcing 

the structure of the center fuselage by 

installing external stiffeners (butt straps) 

at frame (FR) 53.3 on the fuselage skin 

between left-hand and right-hand 

stringer 13, and related investigative 

actions. This AD results from a report 

that, during fatigue tests of the fuselage, 

cracks initiated and grew at the 

circumferential joint of FR53.3. We are 

issuing this AD to prevent fatigue 

cracking of the fuselage, which could 

result in reduced structural integrity of 

the fuselage. 

DATES: Effective October 19, 2005. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of October 19, 2005. 

We must receive comments on this 

AD by December 5, 2005. 

ADDRESSES: Use one of the following 

addresses to submit comments on this 

AD. 

• DOT Docket web site: Go to 

http://dms.dot.gov and follow the 

instructions for sending your comments 

electronically. 

• Government-wide rulemaking web 

site: Go to http://www.regulations.gov 

and follow the instructions for sending 

your comments electronically. 

• Mail: Docket Management Facility; 

U.S. Department of Transportation, 400 

Seventh Street SW., Nassif Building, 

room PL–401, Washington, DC 20590. 

• Fax: (202) 493–2251. 

• 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. 

Contact Airbus, 1 Rond Point Maurice 

Bellonte, 31707 Blagnac Cedex, France, 

for service information identified in this 

AD. 

FOR FURTHER INFORMATION CONTACT: Tim 

Backman, Aerospace Engineer, ANM–

116, International Branch, FAA, 

Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington 

98055–4056; telephone (425) 227–2797; 

fax (425) 227–1149. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

Although this is a final rule that was 

not preceded by notice and an 

opportunity for public comment, we 

invite you to submit any relevant 

written data, views, or arguments 

regarding this AD. Include ‘‘Docket No. 

FAA–2005–22539; Directorate Identifier 

2004–NM–08–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy