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

29697

Vol. 61, No. 114

Wednesday, June 12, 1996

NATIONAL CREDIT UNION

ADMINISTRATION

12 CFR Part 703

Investment and Deposit Activities

AGENCY: National Credit Union

Administration (NCUA).

ACTION: Proposed rule; Extension of

comment period.

SUMMARY: On November 29, 1995 (60 FR

61219), the National Credit Union

Administration (NUCA) published for

public comment a proposed rule

regarding investment and deposit

activities for credit unions. The

comment period for this proposed rule

was to have expired on March 28, 1996.

The original comment period was

extended to June 26, 1996 (61 FR 8499).

A national trade association has

requested an additional extension in

which to respond in order to review the

proposed rule concurrently with the

proposed rule governing corporate

credit unions which was issued by the

NCUA Board on May 22, 1996 with a

90-day comment period. To encourage

additional comments, the NCUA Board

has decided to extend the comment

period on the proposed rule. The

extended comment period now expires

September 30, 1996.

DATES: The comment period has been

extended and now expires September

30, 1996. Comments must be received

on or before September 30, 1996.

ADDRESSES: Comments should be

directed to Becky Baker, Secretary of the

Board. Mail or hand-deliver comments

to: National Credit Union

Administration Board, 1775 Duke

Street, Alexandria, Virginia 22314–

3428. Fax comments to (703) 518–6480.

Please send comments by one method

only.

FOR FURTHER INFORMATION CONTACT:

David M. Marquis, Director, Office of

Examination and Insurance, (703) 518–

6360, or Daniel Gordon, Senior

Investment Officer, (703) 518–6620, or

at the above address.

By the National Credit Union

Administration Board on June 3, 1996.

Becky Baker,

Secretary of the Board.

[FR Doc. 96–14919 Filed 6–11–96; 8:45 am]

BILLING CODE 7535–01–M

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96–ANE–09]

RIN 2120–AA64

Airworthiness Directives; Rolls-Royce

plc RB211–535E4 and –535E4–B Series

Turbofan Engines

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Notice of proposed rulemaking

(NPRM).

SUMMARY: This document proposes the

adoption of a new airworthiness

directive (AD) that is applicable to

Rolls-Royce plc RB211–535E4 and

–535E4–B series turbofan engines. This

proposal would require installation of

an improved fuel flow governor that

incorporates revised minimum

compressor discharge P4 stop settings.

This proposal is prompted by reports of

engine rundowns during low idle

descent during icing conditions. The

actions specified by the proposed AD

are intended to prevent compressor stall

and subsequent engine rundown on one

or both engines.

DATES: Comments must be received by

August 12, 1996.

ADDRESSES: Submit comments in

triplicate to the Federal Aviation

Administration (FAA), New England

Region, Office of the Assistant Chief

Counsel, Attention: Rules Docket No.

96–ANE–09, 12 New England Executive

Park, Burlington, MA 01803–5299.

Comments may also be submitted to the

Rules Docket by using the following

Internet address: ‘‘epdadcomments@mail.hq.faa.gov’’.

Comments may be inspected at this

location between 8:00 a.m. and 4:30

p.m., Monday through Friday, except

Federal holidays.

The service information referenced in

the proposed rule may be obtained from

Rolls-Royce plc, P.O. Box 31, Moor

Lane, Derby, DE248BJ, United Kingdom;

telephone 1332–249428, fax 1332–

249423. This information may be

examined at the FAA, New England

Region, Office of the Assistant Chief

Counsel, 12 New England Executive

Park, Burlington, MA.

FOR FURTHER INFORMATION CONTACT:

Daniel Kerman, Aerospace Engineer,

Engine Certification Office, FAA, Engine

and Propeller Directorate, 12 New

England Executive Park, Burlington, MA

01803–5299; telephone (617) 238–7130,

fax (617) 238–7199.

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

should identify 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 96–ANE–09.’’ 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, New England Region, Office of the

Assistant Chief Counsel, Attention:

Rules Docket No. 96–ANE–09, 12 New

England Executive Park, Burlington, MA

01803–5299.
29698 Federal Register / Vol. 61, No. 114 / Wednesday, June 12, 1996 / Proposed Rules

Discussion

The Civil Aviation Authority (CAA),

which is the airworthiness authority for

the United Kingdom, recently notified

the Federal Aviation Administration

(FAA) that an unsafe condition may

exist on Rolls-Royce plc (R–R) RB211–

535 series turbofan engines. The CAA

advises that they have reports of seven

engine rundown events on the R–R

RB211–535E4 and –535E4–B engines

installed on Boeing 757–200 series

aircraft since January 1992. All of the

events occurred within a narrow band of

altitude between 25,000 and 29,000 feet.

In four of the seven events, the second

engine installed on the aircraft surged

and recovered. In six of the seven

events, the engine rundowns occurred

approximately 3 to 5 seconds following

selection of inlet cowl anti-ice during

the descent phase of flight. Selection of

cowl inlet anti-ice results in an engine

acceleration from low idle to high idle

thrust, which can cause liberation of

accreted ice within the engine core. In

one event, the rundown occurred

following an auto-throttle initiated

acceleration.

Rolls-Royce plc has performed

extensive analysis and testing and has

concluded that the engine rundown is

due to the following: (1) Ice accretion at

the inlet to the Intermediate Pressure

Compressor (IPC) induces a rotating

compressor stall during descent, which

leads to a High Pressure Compressor

(HPC) surge on acceleration; and (2) Ice

accretion at the inlet to the IPC during

descent is released into the core engine,

which in turn causes an HPC surge. This

condition, if not corrected, could result

in compressor stall and subsequent

engine rundown on one or both engines.

The manufacturer has determined that

the proposed solution for preventing

engine rundown is to raise the

minimum compressor discharge P4 stop

setting in the fuel flow governor (FFG),

which will increase the low idle

schedule above the engine idle

conditions experienced during all of the

prior engine rundown events. This

schedule increase will result in a

substantial increase in IPC stall margin,

a moderate increase in HPC stall margin,

as well as provide the additional benefit

of increased ice accretion tolerance due

to increased compressor airflow.

Rolls-Royce plc has issued Mandatory

(SB) No. RB.211–73–B869, Revision 1,

dated May 24, 1996, that specifies

installation of an improved FFG, which

incorporates an increased minimum

compressor discharge pressure P4 stop

setting, which will result in increased

engine idle speeds.

The FAA Transport Airplane

Directorate issued AD 96–04– 11,

Amendment 39–9523, (61 FR 6935,

February 23, 1996) applicable to Boeing

757–200 series airplanes equipped with

R–R Model RB211–535E4 and –535E4–

B engines, that requires revision of the

limitations section of the FAA-approved

Airplane Flight Manual (AFM) to

require the flight crew to activate engine

inlet cowl thermal anti-ice systems on

both engines prior to descent.

Installation of the improved FFG on

both engines for each aircraft would

constitute terminating action to the

AFM revision requirements of AD 96–

04–11.

This engine model is manufactured in

the United Kingdom and is type

certificated for operation in the United

States under the provisions of Section

21.29 of the Federal Aviation

Regulations (14 CFR 21.29) and the

applicable bilateral airworthiness

agreement. Pursuant to this bilateral

airworthiness agreement, the CAA has

kept the FAA informed of the situation

described above. The FAA has

examined the findings of the CAA,

reviewed all available information, and

determined that AD action is necessary

for products of this type design that are

certificated for operation in the United

States.

Since an unsafe condition has been

identified that is likely to exist or

develop on other engines of the same

type design registered in the United

States, the proposed AD would require

installation of improved FFGs that

incorporate revised minimum

compressor discharge P4 stop settings.

This revised setting will raise the steady

state low idle schedule above the idle

conditions experienced during any of

the prior engine rundown events. This

schedule increase will result in a

substantial increase in IPC stall margin,

a moderate increase in HPC stall margin,

as well as provide the additional benefit

of increased ice accretion tolerance due

to increased compressor airflow. This

proposed action must be accomplished

at the next shop visit, or within 9

calendar months after the effective date

of this AD, whichever occurs first. The

FAA has determined the calendar enddate based on the time interval required

for fleet modification. The actions

would be required to be accomplished

in accordance with SB described

previously.

There are approximately 770 engines

of the affected design in the worldwide

fleet. The FAA estimates that 381

engines installed on aircraft of U.S.

registry would be affected by this

proposed AD, that it would take

approximately 3 work hours per engine

to accomplish the proposed actions, and

that the average labor rate is $60 per

work hour. The affected FFGs would be

modified to incorporate the changes

required by this proposed AD on a freeof-charge basis per engine. Based on

these figures, the total cost impact of the

proposed AD on U.S. operators is

estimated to be $68,580.

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

adding the following new airworthiness

directive:

Rolls-Royce plc: Docket No. 96–ANE–09.

Applicability: Rolls-Royce plc. (R–R)

Models RB211– 535E4 and –535E4–B

turbofan engines installed on Boeing 757–

200 series aircraft.
Federal Register / Vol. 61, No. 114 / Wednesday, June 12, 1996 / Proposed Rules 29699

Note: This airworthiness directive (AD)

applies to each engine identified in the

preceding applicability provision, regardless

of whether it has been modified, altered, or

repaired in the area subject to the

requirements of this AD. For engines 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 (d)

to request approval from the Federal Aviation

Administration (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 engine from the

applicability of this AD.

Compliance: Required as indicated, unless

accomplished previously.

To prevent compressor stall and

subsequent engine rundown on one or both

engines, accomplish the following:

(a) At the next shop visit, but no later than

9 calendar months after the effective date of

this AD, install a fuel flow governor (FFG)

that incorporates a revised minimum

compressor discharge P4 stop setting, in

accordance with R–R Mandatory Service

Bulletin (SB) No. RB.211–73–B869, Revision

1, dated May 24, 1996.

(b) Installation of improved FFG’s on both

engines for each Boeing 757 aircraft in

accordance with paragraph (a) of this AD

constitutes terminating action to the

requirements of AD 96–04–11.

(c) For the purpose of this AD, a shop visit

is defined as removal of the engine from the

aircraft for maintenance.

(d) 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, Engine

Certification Office. The request should be

forwarded through an appropriate FAA

Principal Maintenance Inspector, who may

add comments and then send it to the

Manager, Engine Certification Office.

Note: Information concerning the existence

of approved alternative methods of

compliance with this airworthiness directive,

if any, may be obtained from the Engine

Certification Office.

Issued in Burlington, Massachusetts, on

May 22, 1996.

Robert E. Guyotte,

Acting Manager, Engine and Propeller

Directorate, Aircraft Certification Service.

[FR Doc. 96–14866 Filed 6–11–96; 8:45 am]

BILLING CODE 4910–13–U

14 CFR Part 71

[Airspace Docket No. 96–ANM–012]

Proposed Establishment of Class E

Airspace; Grants Pass, Oregon.

AGENCY: Federal Aviation

Administration (FAA), DOT.

ACTION: Notice of Proposed Rulemaking

(NPRM).

SUMMARY: This proposed rule would

establish the Grants Pass, Oregon, Class

E airspace to accommodate a new

Global Positioning System (GPS)

standard instrument approach

procedure (SIAP) to the Grants Pass

Airport. The area would be depicted on

aeronautical charts for pilot reference.

DATES: Comments must be received on

or before July 19, 1996.

ADDRESSES: Send comments on the

proposal in triplicate to: Manager,

Operations Branch ANM–530, Federal

Aviation Administration, Docket No.

96–ANM–012, 1601 Lind Avenue S.W.,

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–532.4, Federal

Aviation Administration, Docket No.

96–ANM–012, 1601 Lind Avenue S.W.,

Renton, Washington 98055–4056;

telephone number: (206) 227–2535.

SUPPLEMENTARY INFORMATION:

Comments Invited

Interested parties are invited to

participate in this proposed rulemaking

by submitting such written data, views,

or arguments as they may desire.

Comments that provide the factual basis

supporting the views and suggestions

presented are particularly helpful in

developing reasoned regulatory

decisions on the proposal. Comments

are specifically invited on the overall

regulatory, aeronautical, economic,

environmental, and energy related

aspects of the proposal.

Communications should identify the

airspace docket number and be

submitted in triplicate to the address

listed above. Commenters wishing the

FAA to acknowledge receipt of their

comments on this notice must submit

with those comments a self-addressed,

stamped postcard on which the

following statement is made:

‘‘Comments to Airspace Docket No. 96–

ANM–012.’’ The postcard will be date/

time stamped and returned to the

commenter. All communications

received on or before the specified

closing date for comments will be

considered before taking action on the

proposed rule. The proposal contained

in this notice may be changed in the

light of comments received. All

comments submitted will be available

for examination at the address listed

above both before and after the closing

date for comments. A report

summarizing each substantive public

contact with FAA personnel concerned

with this rulemaking will be filed in the

docket.

Availability of NPRM’s

Any person may obtain a copy of this

NPRM by submitting a request to the

Federal Aviation Administration,

Operations Branch, ANM–530, 1601

Lind Avenue S.W., Renton, Washington

98055–4056. Communications must

identify the notice number of this

NPRM. Persons interested in being

placed on a mailing list for future

NPRM’s should also request a copy of

Advisory Circular No. 11–2A, which

describes the application procedure.

The Proposal

The FAA is considering an

amendment to part 71 of the Federal

Aviation Regulations (14 CFR part 71) to

establish Class E airspace at Grants Pass,

Oregon, to accommodate a new GPS

SIAP at Grants Pass Airport. The area

would be depicted on aeronautical

charts for pilot reference. The

coordinates for this airspace docket are

based on North American Datum 83.

Class E airspace areas extending upward

from 700 feet or more above the surface

of the earth are published in Paragraph

6005 of FAA Order 7400.9C dated

August 17, 1995, and effective

September 16, 1995, which is

incorporated by reference in 14 CFR

71.1. The Class E airspace designation

listed in this document would be

published subsequently in the Order.

The FAA has determined that this

proposed 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,

when promulgated, 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).