This section of the FEDERAL REGISTER

contains regulatory documents having general

applicability and legal effect, most of which

are keyed to and codified in the Code of

Federal Regulations, which is published under

50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by

the Superintendent of Documents. Prices of

new books are listed in the first FEDERAL

REGISTER issue of each week.

Rules and Regulations Federal Register

26775

Vol. 61, No. 104

Wednesday, May 29, 1996

DEPARTMENT OF TRANSPORTATION

Federation Aviation Administration

14 CFR Part 25

[Docket No. NM–126; Special Conditions

No. 25–ANM–16]

Special Conditions: Dassault Aviation,

Mystere Falcon 50 Airplane; HighIntensity Radiated Fields

AGENCY: Federal Aviation

Administration (FAA), DOT.

ACTION: Final special conditions; request

for comments.

SUMMARY: These special conditions are

issued for the Dassault Aviation,

Mystere Falcon 50 airplane modified by

Garrett Aviation Services of Springfield,

Illinois. This airplane will be equipped

with a Collins EFIS–86C(14) Electronic

Flight Instrument System that provides

critical data to the flightcrew. The

applicable regulations do not contain

adequate or appropriate safety standards

for the position of these systems from

the effects of high-intensity radiated

fields. 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 May 21, 1996.

Comments must be received on or

before July 15, 1996.

ADDRESSES: Comments on these final

special conditions, request for

comments, may be mailed in duplicate

to: Federal Aviation Administration,

Office of the Assistant Chief Counsel,

Attn: Rules Docket (ANM–7), Docket

No. NM–126, 1601 Lind Avenue SW.,

Renton, Washington, 98055–4056; or

delivered in duplicate to the Office of

the Assistant Chief Counsel at the above

address. Comments must be marked:

Docket No. NM–126. Comments may be

inspected in the Rules Docket

weekdays, except Federal holidays,

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

FOR FURTHER INFORMATION CONTACT:

Connie Beane, FAA, Standardization

Branch, ANM–113, Transport Airplane

Directorate, Aircraft Certification

Service, 1601 Lind Avenue SW.,

Renton, Washington, 98055–4056;

telephone (206) 227–2796; facsimile

(206) 227–1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA has determined that good

cause exists for making these special

conditions effective upon issuance;

however, interested persons are invited

to submit such written data, views, or

arguments as they may desire.

Communications should identify the

regulatory docket and special conditions

number and be submitted in duplicate

to the address specified above. All

communications received on or before

the closing date for comments will be

considered by the Administrator. These

special conditions may be changed in

light of comments received. All

comments submitted will be available in

the Rules Docket for examination by

interested persons, both before and after

the closing date for comments. A report

summarizing each substantive public

contact with FAA personnel concerning

this rulemaking will be filed in the

docket. Persons wishing the FAA to

acknowledge receipt of their comments

submitted in response to this request

must submit with those comments a

self-addressed, stamped postcard on

which the following statement is made:

‘‘Comments to Docket No. NM–126.’’

The postcard will be date stamped and

returned to the commenter.

Background

On March 7, 1996, Garrett Aviation

Services of Springfield, Illinois, applied

for a supplemental type certificate to

modify Dassault Aviation, Mystere

Falcon 50 airplanes. The Dassault

Aviation, Mystere Falcon 50 is a

business jet with three aft mounted

turbine engines. The airplane can carry

three crew and 19 passengers depending

on the configuration, and is capable of

operating to an altitude of 49,000 feet.

The proposed modification incorporates

the installation of a Collins EFIS–

86C(14) Electronic Flight Instrument

System (EFIS)), which is potentially

vulnerable to high-intensity radiated

fields (HIRF) external to the airplane.

Supplemental Type Certification Basis

Under the provisions of § 21.101 of

the Federal Aviation Regulations (FAR),

Garrett Aviation Services must show

that the altered Dassault Aviation,

Mystere Falcon 50 airplane continues to

meet the applicable provisions of

§ 21.29; and part 25, effective February

1, 1965, as amended by Amendments

25–1 through 25–34 and § 25.255 of

Amendments 25–42; § 25.979(d) and (e)

of Amendments 25–38; § 25.1013(b)(1)

of Amendments 25–36; § 25.1351(d) of

Amendments 25–41; § 25.1353(c)(6) of

Amendments 25–42; part 36 of the FAR

effective December 1, 1969, as amended

through Amendment 36–9; Special

Federal Aviation Regulations (SFAR) 27

effective February 1, 1974, as amended

through Amendment SFAR 27–1; and

Special Conditions 25–86–EU–24. In

addition, the certification basis may

include other special conditions 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 the Dassault Aviation,

Mystere Falcon 50 airplane because of a

novel or unusual design feature, special

conditions are prescribed under the

provisions of § 21.16 to establish a level

of safety equivalent to that established

in the regulations.

Special conditions, as appropriate, are

issued in accordance with § 11.49 of the

FAR after public notice, as required by

§§ 11.28 and 11.29, and become part of

the type certification basis in

accordance with § 21.17(a)(2).

Special conditions are initially

applicable to the model for which they

are issued. Should the type certificate

for that model be amended later to

include any other model that

incorporates the same novel or unusual

design feature, the special conditions

would also apply to the other model

under the provisions of § 21.101(a)(1).

Novel or Unusual Design Features

The Dassault Aviation, Mystere

Falcon 50 airplane incorporates a

Collins EFIS–86c(14) system that

provides critical date to the flightcrew.

This system may be vulnerable to HIRF

external to the airplane.
26776 Federal Register / Vol. 61, No. 104 / Wednesday, May 29, 1996 / Rules and Regulations

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 electrical and

electronic 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 issued

for the Dassault Aviation, Mystere

Falcon 50, which would require that

new technology electrical and electronic

systems, such as the EFIS, etc., 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, plus the advent of space

and satellite communications, coupled

with electronic command and control of

the airplane, the immunity of critical

digital avionics systems to HIFR 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 paragraphs 1 or 2 below:

1. A minimum threat of 100 volts per

meter peak 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

following field strengths for the frequency

ranges indicated.

Frequency Peak

(V/M)

Average

(V/M)

10 KHz–100 KHz .......... 50 50

100 KHz–500 KHz ........ 60 60

500 KHz–2000 KHz ...... 70 70

2 MHz–30 MHz ............. 200 200

30 MHz–100 MHz ......... 30 30

100 MHz–200 MHz ....... 150 33

200 MHz–400 MHz ....... 70 70

Frequency Peak

(V/M)

Average

(V/M)

400 MHz–700 MHz ....... 4,020 935

700 MHz–1000 MHz ..... 1,700 170

1 GHz–2 GHz ............... 5,000 990

2 GHz–4 GHz ............... 6,680 840

4 GHz–6 GHz ............... 6,850 310

6 GHz–8 GHz ............... 3,600 670

8 GHz–12 GHz ............. 3,500 1,270

12 GHz–18 GHz ........... 3,500 360

18 GHz–40 GHz ........... 2,100 750

As discussed above, these special

conditions would be applicable initially

to the Garrett Aviation Services

modified Dassault Aviation, Mystere

Falcon 50. Should Garrett Aviation

Services apply at a later date for a

change to the supplemental type

certificate to include another model

incorporating the same novel or unusual

design feature, the special conditions

would apply to that model as well

under the provisions of § 21.101(a)(1).

Conclusion

This action affects only certain design

features on the Dassault Aviation,

Mystere Falcon 50 airplane. It is not a

rule of general applicability and affects

only the manufacturer who applied to

the FAA for approval of these features

on the airplane.

The substance of these special

conditions for this airplane has been

subjected to the notice and comment

procedure in several prior instances and

has been derived without substantive

change from those previously issued. It

is unlikely that prior public comment

would result in a significant change

from the substance contained herein.

For this reason, and 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.

Therefore, these special conditions are

being made effective 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, the following special

conditions are issued as part of the

supplemental type certification basis for

the Garrett Aviation Services modified

Dassault Aviation, Mystere Falcon 50

series airplanes.

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, on May 21,

1996.

Norman B. Martenson,

Acting Manager, Transport Airplane

Directorate, Aircraft Certification Service,

ANM–100.

[FR Doc. 96–13426 Filed 5–28–96; 8:45 am]

BILLING CODE 4910–13–M

14 CFR Part 39

[Docket No. 96–NM–94–AD; Amendment

39–9635; AD 96–11–10]

RIN 2120–AA64

Airworthiness Directives; Israel

Aircraft Industries (IAI), Ltd., Model

1125 Westwind Astra Series Airplanes

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Final rule; request for

comments.

SUMMARY: This amendment adopts a

new airworthiness directive (AD) that is

applicable to certain IAI, Ltd., Model

1125 Westwind Astra series airplanes.

This action requires a visual inspection

for clearance between the hydraulic

lines/vacuum lines and the electrical

wire bundles, and repair or replacement

of damaged lines or wire bundles with

serviceable parts. This AD also requires

installation of neoprene hose around the

affected hydraulic lines and vacuum

lines. This amendment is prompted by

a report indicating that chafing was

found on a hydraulic line. The actions

specified in this AD are intended to

prevent such chafing, which could