10486 Federal Register / Vol. 60, No. 38 / Monday, February 27, 1995 / Rules and Regulations

BILLING CODE 4910–13–C

Issued in Renton, Washington, on February

3, 1995.

Darrell M. Pederson,

Assistant Manager, Transport Airplane

Directorate, Aircraft Certification Service,

NAM–101.

[FR Doc. 95–4774 Filed 2–24–95; 8:45 am]

BILLING CODE 4910–13–M

14 CFR Part 25

[Docket No. NM–108; Special Conditions

No. 25–ANM–96]

Special Conditions: Modified

Gulfstream American Corporation

Model G–IV Airplane; High Intensity

Radiated Fields (HIRF)

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Final special conditions; request

for comments.

SUMMARY: These special conditions are

issued for the Gulfstream American

Corporation (GAC) Model G–IV airplane

modified by Duncan Aviation, Inc., of

Lincoln, Nebraska. This airplane will be

equipped with a Flight Visions

Corporation, FV–2000 Head-Up Display

System (HUD) that will perform critical

functions. The applicable regulations do

not contain adequate or appropriate

safety standards for the protection of the

HUD from the effects of high-intensity

radiated fields (HIRF). These special

conditions provide the additional safety

standards that the Administrator

considers necessary to ensure that the

critical functions performed by this

system are maintained when the

airplane is exposed to HIRF.

DATES: The effective date of these

special conditions is February 13, 1995.

Comments must be received on or

before April 13, 1995.

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–108, 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–108.’’ 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:

Mark Quam, FAA, Standardization

Branch, Transport Airplane Directorate,

Aircraft Certification Service, 1601 Lind

Avenue SW., Renton, Washington,

98055–4056; telephone (206) 227–2145.

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 the comments received. All
Federal Register / Vol. 60, No. 38 / Monday, February 27, 1995 / Rules and Regulations 10487

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–108.’’

The postcard will be date stamped and

returned to the commenter.

Background

On August 16, 1994, Duncan

Aviation, Inc., of Lincoln, Nebraska,

applied for a supplemental type

certificate to modify the Gulfstream

American Corporation (GAC) Model G–

IV airplane. The GAC Model G–IV

airplane is a business jet with two aftmounted turbofan engines. The airplane

can carry two pilots and 19 passengers,

depending on the exit and interior

configuration, and is capable of

operating to an altitude of 45,000 feet.

The proposed modification incorporates

the installation of a digital avionics

system that will present critical

functions on the Head-up Display

System (HUD), 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),

Duncan Aviation, Inc., must show that

the altered GAC Model G–IV airplane

continues to meet the applicable

provisions of the regulations

incorporated by reference in Type

Certificate No. A12EU, 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 regulations incorporated by

reference in Type Certificate No. A12EU

include the following for the GAC

Model G–IV airplanes: § 21.29 of 14 CFR

part 21 and 14 CFR part 25, dated

February 1, 1965, as amended by

Amendments 25–1 through 25–26. In

addition, under § 21.101(b)(1), the

following sections of the FAR apply to

the HUD installation: § 25.1322, as

amended by Amendment 25–38; and

§§ 25.1309, 25.1321(a)(b) (d), and (e),

25.1331, 25.1333, and 25.1335, as

amended by Amendment 25–41. These

special conditions will form an

additional part of the supplemental type

certification basis.

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 GAC Model G–IV

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 § 21.101(b)(2).

Special conditions are initially

applicable to the model for which they

are issued. Should the applicant apply

for a supplemental type certificate to

modify any other model included on the

same type certificate to incorporate 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).

Discussion

There is no specific regulation that

addresses protection requirements for

electrical and electronic systems from

high-intensity radiated fields (HIRF).

Increased power levels from groundbased 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 needed

for the modified GAC Model G–IV

airplanes that would require that the

HUD be designed and installed to

preclude component damage and

interruption of function due to the

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, such as the

HUD, to HIRF must be established.

It is not possible to precisely define

the HIRF to which the airplanes 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–70 MHz .......... 30 30

70 MHz–100 MHz ........ 30 30

100 MHz–200 MHz ...... 150 33

200 MHz–400 MHz ...... 70 70

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 are applicable to the GAC

Model G–IV airplane, modified by

Duncan Aviation. Should Duncan

Aviation apply at a later date for a

supplemental type certificate to modify

any other model included on Type

Certificate No. A12EU to incorporate 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

unusual or novel design features on

GAC Model G–IV airplanes modified by

Duncan Aviation. It is not a rule of

general applicability and affects only

the applicant who applied to the FAA

for approval of this feature on this

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. It is

unlikely that prior public comment
10488 Federal Register / Vol. 60, No. 38 / Monday, February 27, 1995 / Rules and Regulations

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. app. 1344, 1348(c),

1352, 1354(a), 1355, 1421 through 1431,

1502, 1651(b)(2), 42 U.S.C. 1857f–10, 4321 et

seq.; E.O. 11514; and 49 U.S.C. 106(g).

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 GAC Model G–IV airplane, as

modified by Duncan Aviation:

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

external to the airplane.

2. The following definition applies

with respect to this special condition:

Critical Function. 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 February

13, 1995.

Darrell M. Pederson,

Assistant Manager, Transport Airplane

Directorate, Aircraft Certification Service,

ANM–101.

[FR Doc. 95–4773 Filed 2–24–95; 8:45 am]

BILLING CODE 4910–13–M

14 CFR Part 71

[Airspace Docket No. 94–AGL–31]

Modification of Class D Airspace;

Cleveland, OH

AGENCY: Federal Aviation

Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: This action modifies Class D

airspace at Cleveland, Burke Lakefront,

OH by adjusting the lower vertical

limits of the Class D area up to but not

including the base altitude of the

overlying Class B airspace area.

Associated with airspace

reclassification, guidelines have been

established for depicting Class D

airspace areas that underlie Class B

airspace areas. The intent of this action

is to eliminate confusion to pilots by

appropriately identifying controlled

airspace areas at Cleveland, Burke

Lakefront, OH.

EFFECTIVE DATE: 0901 UTC, May 25,

1995.

FOR FURTHER INFORMATION CONTACT:

Nancy Cibic, Air Traffic Division,

System Management Branch, AGL–530,

Federal Aviation Administration, 2300

East Devon Avenue, Des Plaines, Illinois

60018, telephone (708) 294–7573.

SUPPLEMENTARY INFORMATION:

History

On December 23, 1994, the FAA

proposed to amend part 71 of the

Federal Aviation Regulations (14 CFR

part 71) to modify the Class D airspace

area at Cleveland, Burke Lakefront, OH

(59 FR 246).

Airspace Reclassification, effective

September 16, 1993, discontinued the

use of the term ‘‘control zone’’ and

replaced it with the designation ‘‘Class

D’’ airspace. Subsequent to and

associated with airspace reclassification,

new guidelines have been established

for depicting Class D airspace areas that

underlie Class B airspace areas. The

base altitude of the higher class

airspace, in this case Class B airspace,

supersedes the vertical limits of the

Class D airspace area. Therefore, this

action adjusts the lower vertical limits

of the Class D area up to but not

including the base of the overlying Class

B airspace area. The intent of this action

is to eliminate confusion to pilots by

appropriately identifying the controlled

airspace areas at Cleveland, Burke

Lakefront Airport, OH. Interested parties

were invited to participate in this

rulemaking proceeding by submitting

written comments on the proposal to the

FAA. No comments objecting to the

proposal were received.

The coordinates for this airspace

docket are based on North American

Datum 83. Class D airspace designations

are published in Paragraph 5000 of FAA

Order 7400.9B dated July 18, 1994, and

effective September 16, 1994, which is

incorporated by reference in 14 CFR

71.1. The Class D airspace designation

listed in this document will be

published subsequently in the Order.

The Rule

This amendment to part 71 of the

Federal Aviation Regulations modifies

Class D airspace at Cleveland, Burke

Lakefront Airport, OH to coincide with

the guidelines for depicting Class D

airspace areas.

The FAA has determined that this

regulation only involves an established

body of technical regulations for which

frequent and routine amendments are

necessary to keep them operationally

current. It, therefore—(1) is not a

‘‘significant regulatory action’’ under

Executive Order 12866; (2) is not a

‘‘significant rule’’ under DOT

Regulatory Policies and Procedures (44

FR 11034; February 26, 1979); and (3)

does not warrant preparation of a

regulatory evaluation as the anticipated

impact is so minimal. Since this is a

routine matter that will only affect air

traffic procedures and air navigation, it

is certified that this rule will not have

a significant economic impact on a

substantial number of small entities

under the criteria of the Regulatory

Flexibility Act.

List of Subjects in 14 CFR Part 71

Airspace, Incorporation by reference,

Navigation (air).

Adoption of the Amendment

In consideration of the foregoing, the

Federal Aviation Administration

amends 14 CFR part 71 as follows:

PART 71—[AMENDED]

1. The authority citation for 14 CFR

part 71 continues to read as follows:

Authority: 49 U.S.C. app. 1348(a), 1354(a),

1510; E.O. 10854, 24 FR 9565, 3 CFR, 1959–

1963 Comp., p. 389; 49 U.S.C. 106(g); 14 CFR

11.69.

§ 71.1 [Amended]

2. The incorporation by reference in

14 CFR 71.1 of the Federal Aviation

Administration Order 7400.9B, Airspace

Designations and Reporting Points,

dated July 18, 1994, and effective

September 16, 1994, is amended as

follows:

Paragraph 5000 General

* * * * *