This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

2730

Vol. 61, No. 19

Monday, January 29, 1996

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 95–NM–162–AD]

Airworthiness Directives; Boeing

Model 747–200, -300, and -400 Series

Airplanes Equipped with General

Electric Model CF6–80C2 PMC and

CF6–80C2 FADEC Engines, and Pratt &

Whitney Model PW4000 Engines

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Notice of proposed rulemaking

(NPRM).

SUMMARY: This document proposes the

supersedure of an existing airworthiness

directive (AD), applicable to certain

Boeing Model 747–200, –300, and –400

series airplanes, that currently requires

inspection of each fuel feed line of the

outboard engine in the engine strut to

determine if interference with an

adjacent pneumatic duct clamp has

caused damage, and repair or

replacement of the fuel feed tube, if

necessary. That AD also currently

requires inspection and replacement of

the adjacent pneumatic duct clamp with

a non-rotating type clamp, if necessary.

This action would require modification

of the upper gap area of the strut of the

number 1 and 4 engines. This proposal

is prompted by a report of fuel leakage

in the strut of the number 4 engine due

to a high profile clamp that chafed the

fuel line. The actions specified by the

proposed AD are intended to prevent

chafing of the fuel line in the strut of the

number 1 and 4 engines, which could

result in rupture of the fuel line and

subsequent in-flight engine fire.

DATES: Comments must be received by

March 25, 1996.

ADDRESSES: Submit comments in

triplicate to the Federal Aviation

Administration (FAA), Transport

Airplane Directorate, ANM–103,

Attention: Rules Docket No. 95–NM–

162–AD, 1601 Lind Avenue, SW.,

Renton, Washington 98055–4056.

Comments may be inspected at this

location between 9:00 a.m. and 3:00

p.m., Monday through Friday, except

Federal holidays.

The service information referenced in

the proposed rule may be obtained from

Boeing Commercial Airplane Group,

P.O. Box 3707, Seattle, Washington

98124–2207. This information may be

examined at the FAA, Transport

Airplane Directorate, 1601 Lind

Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT:

Kenneth W. Frey, Aerospace Engineer,

Systems and Equipment Branch, ANM–

130S, FAA, Seattle Aircraft Certification

Office, 1601 Lind Avenue, SW., Renton,

Washington; telephone (206) 227–2673;

fax (206) 227–1181.

SUPPLEMENTARY INFORMATION:

Comments Invited

Interested persons are invited to

participate in the making of the

proposed rule by submitting such

written data, views, or arguments as

they may desire. Communications shall

ientify the Rules Docket number and be

submitted in triplicate to the address

specified above. All communications

received on or before the closing date

for comments, specified above, will be

considered before taking action on the

proposed rule. The proposals contained

in this notice may be changed in light

of the comments received.

Comments are specifically invited on

the overall regulatory, economic,

environmental, and energy aspects of

the proposed rule. All comments

submitted will be available, both before

and after the closing date for comments,

in the Rules Docket for examination by

interested persons. A report

summarizing each FAA-public contact

concerned with the substance of this

proposal will be filed in the Rules

Docket.

Commenters wishing the FAA to

acknowledge receipt of their comments

submitted in response to this notice

must submit a self-addressed, stamped

postcard on which the following

statement is made: ‘‘Comments to

Docket Number 95–NM–162–AD.’’ The

postcard will be date stamped and

returned to the commenter.

Availability of NPRMs

Any person may obtain a copy of this

NPRM by submitting a request to the

FAA, Transport Airplane Directorate,

ANM–103, Attention: Rules Docket No.

95–NM–162–AD, 1601 Lind Avenue,

SW., Renton, Washington 98055–4056.

Discussion

On April 5, 1991, the FAA issued AD

91–05–19, amendment 39–6918 (56 FR

8705, March 1, 1991), applicable to

certain Boeing Model 747–200, –300,

–400 series airplanes equipped with

General Electric Model CF6–80C2 PMC

and CF6–80C2 FADEC engines, and

Pratt & Whitney Model PW4000

engines. That AD currently requires

inspection of each fuel feed line of the

outboard engine in the engine strut to

determine if interference with an

adjacent pneumatic duct clamp has

caused damage to the fuel feed tube; and

repair or replacement of the fuel feed

tube, if necessary. That AD also

currently requires inspection and

replacement of the adjacent pneumatic

duct clamp with a non-rotating type

clamp if a non-rotating clamp is not

already installed. That action was

prompted by report of a fuel leak in the

number 4 engine strut due to a

punctured fuel feed line that had chafed

as a result of contact with a clamp. The

requirements of that AD are intended to

prevent an engine fire.

Since the issuance of that AD, the

FAA has received a report of fuel

leakage in the strut of the number 4

engine. Investigation revealed that the

fuel leakage was caused by a punctured

fuel feed tube; the fuel tube was

punctured as a result of chafing with the

high profile duct clamp. Further

investigation revealed that the high

profile duct clamp, which was

lockwired to the anchor clamp, was

installed in accordance with the

requirements of AD 91–05–19. Due to

failure of the lockwire, the high profile

clamp rotated and chafed the fuel line

in the strut of the number 4 engine. This

condition, if not corrected, could result

in rupture of the fuel line and a

subsequent in-flight engine fire.

The FAA has reviewed and approved

Service Bulletin 747–36A2097, Revision

3, dated September 28, 1995, which

describes procedures for modification of

the upper gap area of the strut of the

number 1 and 4 engines. The

modification involves an inspection to

detect chafing or puncture marks of the

fuel line, and replacement or repair of

the chafed or punctured fuel line. The
Federal Register / Vol. 61, No. 19 / Monday, January 29, 1996 / Proposed Rules 2731

modification also involves replacement

of the high profile clamp on the flap

drive pneumatic duct with a low profile

clamp, and removal of the anchor

clamp, if installed. Accomplishment of

this modification will eliminate chafing

of the fuel line in the strut of the

number 1 and 4 engines.

Since an unsafe condition has been

identified that is likely to exist or

develop on other products of this same

type design, the proposed AD would

supersede AD 91–05–19 to require

modification of the upper gap area of

the strut of the number 1 and 4 engines.

The actions would be required to be

accomplished in accordance with the

service bulletin described previously.

There are approximately 363 Boeing

Model 747–200, –300, –400 series

airplanes equipped with General

Electric Model CF6–80C2 PMC and

CF6–80C2 FADEC engines, and Pratt &

Whitney Model PW4000 engines of the

affected design in the worldwide fleet.

The FAA estimates that 39 airplanes of

U.S. registry would be affected by this

proposed AD.

The actions that are proposed in this

AD action would take approximately 6

work hours per airplane to accomplish,

at an average labor rate of $60 per work

hour. Required parts would be supplied

by the manufacturer at no cost to the

operators. Based on these figures, the

cost impact on U.S. operators of the

proposed requirements of this AD is

estimated to be $14,040, or $360 per

airplane.

The cost impact figures discussed

above are based on assumptions that no

operator has yet accomplished any of

the current or proposed requirements of

this AD action, and that no operator

would accomplish those actions in the

future if this AD were not adopted.

The regulations proposed herein

would not have substantial direct effects

on the States, on the relationship

between the national government and

the States, or on the distribution of

power and responsibilities among the

various levels of government. Therefore,

in accordance with Executive Order

12612, it is determined that this

proposal would not have sufficient

federalism implications to warrant the

preparation of a Federalism Assessment.

For the reasons discussed above, I

certify that this proposed regulation (1)

is not a ‘‘significant regulatory action’’

under Executive Order 12866; (2) is not

a ‘‘significant rule’’ under the DOT

Regulatory Policies and Procedures (44

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

promulgated, will not have a significant

economic impact, positive or negative,

on a substantial number of small entities

under the criteria of the Regulatory

Flexibility Act. A copy of the draft

regulatory evaluation prepared for this

action is contained in the Rules Docket.

A copy of it may be obtained by

contacting the Rules Docket at the

location provided under the caption

ADDRESSES.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation

safety, Safety.

The Proposed Amendment

Accordingly, pursuant to the

authority delegated to me by the

Administrator, the Federal Aviation

Administration proposes to amend part

39 of the Federal Aviation Regulations

(14 CFR part 39) as follows:

PART 39—AIRWORTHINESS

DIRECTIVES

1. The authority citation for part 39

continues to read as follows:

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

§ 39.13 [Amended]

2. Section 39.13 is amended by

removing amendment 39–6918 (56 FR

8705, March 1, 1991), and by adding a

new airworthiness directive (AD), to

read as follows:

Boeing: Docket 95–NM–162–AD. Supersedes

AD 91–05–19, Amendment 39–6918.

Applicability: Model 747–200, –300, and

–400 series airplanes having line positions

679 through 1041 inclusive; equipped with

General Electric Model CF6–80C2 PMC and

CF6–80C2 FADEC, and Pratt & Whitney

Model PW4000 engines; certificated in any

category.

Note 1: This AD applies to each airplane

identified in the preceding applicability

provision, regardless of whether it has been

otherwise modified, altered, or repaired in

the area subject to the requirements of this

AD. For airplanes that have been modified,

altered, or repaired so that the performance

of the requirements of this AD is affected, the

owner/operator must use the authority

provided in paragraph (b) of this AD to

request approval from the FAA. This

approval may address either no action, if the

current configuration eliminates the unsafe

condition; or different actions necessary to

address the unsafe condition described in

this AD. Such a request should include an

assessment of the effect of the changed

configuration on the unsafe condition

addressed by this AD. In no case does the

presence of any modification, alteration, or

repair remove any airplane from the

applicability of this AD.

Compliance: Required as indicated, unless

accomplished previously.

To prevent chafing of the fuel line in the

strut of the number 1 and 4 engines, which

could result in rupture of the fuel line and

subsequent in-flight engine fire, accomplish

the following:

(a) Within 6 months after the effective date

of this AD, modify the upper gap area of the

strut of the number 1 and 4 engines, in

accordance with Boeing Service Bulletin

747–36A2097, Revision 3, dated September

28, 1995.

(b) An alternative method of compliance or

adjustment of the compliance time that

provides an acceptable level of safety may be

used if approved by the Manager, Seattle

Aircraft Certification Office (ACO), FAA,

Transport Airplane Directorate. Operators

shall submit their requests through an

appropriate FAA Principal Maintenance

Inspector, who may add comments and then

send it to the Manager, Seattle ACO.

Note 2: Information concerning the

existence of approved alternative methods of

compliance with this AD, if any, may be

obtained from the Seattle ACO.

(c) Special flight permits may be issued in

accordance with sections 21.197 and 21.199

of the Federal Aviation Regulations (14 CFR

21.197 and 21.199) to operate the airplane to

a location where the requirements of this AD

can be accomplished.

Issued in Renton, Washington, on January

22, 1996.

Darrell M. Pederson,

Acting Manager, Transport Airplane

Directorate, Aircraft Certification Service.

[FR Doc. 96–1570 Filed 1–26–96; 8:45 am]

BILLING CODE 4910–13–U

14 CFR Part 71

[Airspace Docket No. 95–ANM–29]

Proposed amendment to Class D and

Class E airspace, Hailey, ID

AGENCY: Federal Aviation

Administration (FAA), DOT.

ACTION: Notice of Proposed Rulemaking

(NPRM).

SUMMARY: This proposed rule would

amend the Hailey, Idaho, Class D and

Class E airspace. If amended, the

airspace would accommodate a new

Global Positioning System (GPS)

Standard Instrument Approach

Procedure (SIAP) to Friedman Memorial

Airport, Hailey, Idaho. The area would

be depicted on aeronautical charts for

pilot reference.

DATES: Comments must be received on

or before March 1, 1996.

ADDRESSES: Send comments on the

proposal in triplicate to: Manager,

System Management Branch, ANM–530,

Federal Aviation Administration,

Docket No. 95–ANM–29, 1601 Lind

Avenue SW., Renton, Washington

98055–4056.

The official docket may be examined

at the same address.

An informal docket may also be

examined during normal business hours

at the address listed above.

FOR FURTHER INFORMATION CONTACT:

James Frala, ANM–535/A, Federal