63468 Federal Register / Vol. 60, No. 237 / Monday, December 11, 1995 / Proposed Rules

of the proposed AD on U.S. operators is

estimated to be $1,230,385, or $18,929

per airplane.

The cost impact figure discussed

above is based on assumptions that no

operator has yet accomplished any of

the 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 USC 106(g), 40101, 40113,

44701.

§ 39.13 [Amended]

2. Section 39.13 is amended by

adding the following new airworthiness

directive:

Boeing: Docket 94–NM–226–AD.

Applicability: Model 747 series airplanes,

equipped with Parker inboard elevator power

control packages (PCP) having part numbers

(P/N) 93600–5005 through –5051 inclusive,

or P/N’s 327400–1001, –1003, –1005, and

–1007; certificated in any category.

Note 1: This AD applies to each airplane

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

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 (c) 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 uncommanded elevator

deflection, which could result in structural

damage and reduced controllability of the

airplane, accomplish the following:

(a) For Model 747–400 series airplanes, as

listed in Boeing Alert Service Bulletin 747–

27A2348, Revision 1, dated January 26, 1995:

Within 1 year after the effective date of this

AD, modify the hydraulic tubing of the right

inboard elevator PCP, in accordance with

Boeing Alert Service Bulletin 747–27A2348,

Revision 1, dated January 26, 1995.

(b) For all airplanes: Within 3 years after

the effective date of this AD, modify the left

and right servo assemblies of the inboard

elevator PCP, in accordance with Parker

Service Bulletin 327400–27–171, Revision 1,

dated April 14, 1995, or Parker Service

Bulletin 93600–27–173, dated May 17, 1995,

as applicable.

(c) 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.

(d) 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

December 5, 1995.

Darrell M. Pederson,

Acting Manager, Transport Airplane

Directorate, Aircraft Certification Service.

[FR Doc. 95–30074 Filed 12–8–95; 8:45 am]

BILLING CODE 4910–13–U

14 CFR Part 39

[Docket No. 95–NM–99–AD]

Airworthiness Directives; Fokker

Model F28 Mark 0100 Series Airplanes

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

certain Fokker Model F28 Mark 0100

series airplanes. This proposal would

require inspections to verify the correct

operation of the main landing gear

(MLG) downlock actuators, and

replacement of any discrepant unit with

a serviceable unit. The proposed AD

also would require eventual

replacement of the MLG downlock

actuators with improved units. This

proposal is prompted by reports of

improper operation of the MLG

downlock actuator due to jamming. The

actions specified by the proposed AD

are intended to prevent such jamming of

the downlock actuator, which could

result in failure of the MLG downlock

system, and a potential gear-up landing.

DATES: Comments must be received by

January 22, 1996.

ADDRESSES: Submit comments in

triplicate to the Federal Aviation

Administration (FAA), Transport

Airplane Directorate, ANM–103,

Attention: Rules Docket No. 95–NM–

99–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

Fokker Aircraft USA, Inc., 1199 North

Fairfax Street, Alexandria, Virginia

22314, and Dowty Aerospace, Customer

Support Center, P.O. Box 49, Sterling,

VA 20166. This information may be

examined at the FAA, Transport

Airplane Directorate, 1601 Lind

Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT: Tim

Dulin, Aerospace Engineer,

Standardization Branch, ANM–113,

FAA, Transport Airplane Directorate,

1601 Lind Avenue, SW., Renton,

Washington 98055–4056; telephone

(206) 227–2141; fax (206) 227–1320.

SUPPLEMENTARY INFORMATION:

Comments Invited

Interested persons are invited to

participate in the making of the

proposed rule by submitting such
Federal Register / Vol. 60, No. 237 / Monday, December 11, 1995 / Proposed Rules 63469

written data, views, or arguments as

they may desire. Communications shall

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 95–NM–99–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–99–AD, 1601 Lind Avenue,

SW., Renton, Washington 98055–4056.

Discussion

The Rijksluchtvaartdienst (RLD),

which is the airworthiness authority for

the Netherlands, recently notified the

FAA that an unsafe condition may exist

on certain Fokker Model F28 Mark 0100

series airplanes. The RLD advises that

several operators of these airplanes have

reported that landing gear ‘‘unsafe’’

warning indications have appeared on

the multi-function display unit (MFDU)

after the flight crew selected the landing

gear to the down position. In most cases,

recycling the landing gear resulted in a

positive downlock indication.

Investigation revealed that the main

landing gear (MLG) downlock actuator

(jack and springpot unit) did not operate

properly. Further investigation revealed

that the tip of a spring carrier broke due

to a malformed piston rod and a spring

that was not square, which caused the

spring carrier to move at an angle. A

jammed actuator could result in failure

of the MLG downlock system. This

condition, if not corrected, could result

in a gear-up landing.

Fokker has issued Service Bulletin

SBF100–32–072, dated March 30, 1993,

which describes procedures for

repetitive inspections to verify the

correct operation of any MLG downlock

actuator having part number (P/N)

201218001, 201218002, 201218003, or

201218004, and replacement of

discrepant units with serviceable units.

The Fokker service bulletin references

Dowty Aerospace Hydraulics Service

Bulletin F100–32–505, Revision 1, dated

April 16, 1993. The Dowty Aerospace

Hydraulics service bulletin contains

additional procedures for

accomplishment of the inspection. For

airplanes on which the MLG downlock

actuator operates correctly, the Dowty

Aerospace Hydraulics service bulletin

also specifies procedures for recording

the accomplishment of each inspection

on the unit nameplate.

Fokker also has issued Service

Bulletin SBF100–32–074, dated July 21,

1993, which describes procedures for

replacement of any MLG downlock

actuator having P/N 201218001,

201218002, 201218003, or 201218004

with an improved unit having P/N

201218005, 201218006, 201218007, or

201218008, respectively. The improved

units have improved jack and springpot

units with modified spring carriers and

spring actuators, as well as a new end

fitting subassembly and nut. The Fokker

service bulletin references Dowty

Aerospace Hydraulics Service Bulletin

F100–32–506, dated June 9, 1993, as an

additional source of service information.

The RLD classified these service

bulletins as mandatory and issued

Netherlands airworthiness directive

BLA 93–052/2 (A), dated September 10,

1993, in order to assure the continued

airworthiness of these airplanes in the

Netherlands.

This airplane model is manufactured

in the Netherlands 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 RLD has

kept the FAA informed of the situation

described above. The FAA has

examined the findings of the RLD,

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 airplanes of the same

type design registered in the United

States, the proposed AD would require

repetitive inspections to verify the

correct operation of the MLG downlock

actuators; and replacement of any

discrepant unit with a serviceable unit.

For airplanes on which no discrepant

unit is found, the proposed AD also

would require recording the

accomplishment of each inspection on

the unit nameplate. In addition, the

proposed AD would require eventual

replacement of the MLG downlock

actuators with improved units. The

actions would be required to be

accomplished in accordance with the

service bulletins described previously.

The FAA estimates that 119 airplanes

of U.S. registry would be affected by this

proposed AD, that it would take

approximately 21 work hours per

airplane to accomplish the proposed

actions, at an average labor rate of $60

per work hour. Required parts would be

supplied by the vendor at no cost to

operators. Based on these figures, the

cost impact of the proposed AD on U.S.

operators is estimated to be $149,940, or

$1,260 per airplane.

The cost impact figure discussed

above is based on assumptions that no

operator has yet accomplished any of

the 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.
63470 Federal Register / Vol. 60, No. 237 / Monday, December 11, 1995 / Proposed Rules

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 USC 106(g), 40101, 40113,

44701.

§ 39.13 [Amended]

2. Section 39.13 is amended by

adding the following new airworthiness

directive:

Fokker: Docket 95–NM–99–AD.

Applicability: Model F28 Mark 0100 series

airplanes equipped with Dowty Aerospace

Hydraulics main landing gear (MLG)

downlock actuators having part number (P/

N) 201218001, 201218002, 201218003, or

201218004, all serial numbers; certificated in

any category.

Note 1: This AD applies to each airplane

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

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 (d) 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 jamming of the MLG downlock

actuator and a potential gear-up landing,

accomplish the following:

(a) Within 2 months after the effective date

of this AD, and thereafter at intervals not to

exceed 1,250 landings: Perform an inspection

to verify correct operation of the MLG

downlock actuator having P/N 201218001,

201218002, 201218003, or 201218004, all

serial numbers, in accordance with Fokker

Service Bulletin SBF100–32–072, dated

March 30, 1993, and Dowty Aerospace

Hydraulics Service Bulletin F100–32–505,

Revision 1, dated April 16, 1993.

(1) If the MLG downlock actuator operates

as specified in the inspection procedure

contained in the Accomplishment

Instructions of Dowty Aerospace Hydraulics

Service Bulletin F100–32–505, Revision 1,

dated April 16, 1993, prior to further flight,

record the accomplishment of the inspection

on the unit nameplate in accordance with the

Dowty Aerospace Hydraulics service

bulletin. Following accomplishment of each

subsequent inspection required by this AD,

record the accomplishment of the inspection

in accordance with the requirement of this

paragraph.

(2) If any MLG downlock actuator does not

operate as specified in the inspection

procedure contained in the Accomplishment

Instructions of Dowty Aerospace Hydraulics

Service Bulletin F100–32–505, Revision 1,

dated April 16, 1993, prior to further flight,

replace the downlock actuator with a

serviceable unit, in accordance with Chapter

32–32–05 of the Aircraft Maintenance

Manual. Thereafter, perform repetitive

inspections of the replacement unit in

accordance with paragraph (a) of this AD

until the replacement required by paragraph

(b) of this AD is accomplished.

(b) Within 9 months after the effective date

of this AD, replace any MLG downlock

actuator having P/N 201218001, 201218002,

201218003, or 201218004, any serial number,

with an improved unit having P/N

201218005, 201218006, 201218007, or

201218008, respectively; in accordance with

Fokker Service Bulletin SBF100–32–074,

dated July 21, 1993, and Dowty Aerospace

Hydraulics Service Bulletin F100–32–506,

dated June 9, 1993. Accomplishment of this

replacement constitutes terminating action

for the repetitive inspections required by

paragraph (a) of this AD.

(c) As of the effective date of this AD, no

person shall install on any airplane a MLG

downlock actuator having P/N 201218001,

201218002, 201218003, or 201218004, any

serial number.

(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,

Standardization Branch, ANM–113, 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, Standardization

Branch, ANM–113.

Note 2: Information concerning the

existence of approved alternative methods of

compliance with this AD, if any, may be

obtained from the Standardization Branch,

ANM–113.

(e) 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

December 5, 1995.

Darrell M. Pederson,

Acting Manager, Transport Airplane

Directorate, Aircraft Certification Service.

[FR Doc. 95–30075 Filed 12–8–95; 8:45 am]

BILLING CODE 4910–13–U

14 CFR Part 39

[Docket No. 95–NM–86–AD]

Airworthiness Directives; Fokker

Model F28 Mark 0100 Series Airplanes

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

certain Fokker Model F28 Mark 0100

series airplanes. This proposal would

require inspection(s) to verify that the

position indicator of the fuel balance

transfer valve (FBTV) is in the closed

position, and closing the FBTV, if

necessary; and deactivation of the fuel

balance transfer system (FBTS). This

proposal is prompted by a report that,

under certain failure conditions, the

actuator of the FBTV could remain in

the open position without a flight deck

indication. The actions specified by the

proposed AD are intended to ensure that

the FBTV is not in the open position

during flight, which could lead to the

reduction of fuel supply to the engines

during cross-feed operation and

consequent engine fuel starvation.

DATES: Comments must be received by

January 22, 1996.

ADDRESSES: Submit comments in

triplicate to the Federal Aviation

Administration (FAA), Transport

Airplane Directorate, ANM–103,

Attention: Rules Docket No. 95–NM–

86–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

Fokker Aircraft USA, Inc., 1199 North

Fairfax Street, Alexandria, Virginia

22314. This information may be

examined at the FAA, Transport

Airplane Directorate, 1601 Lind

Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT: Tim

Dulin, Aerospace Engineer,

Standardization Branch, ANM–113,

FAA, Transport Airplane Directorate,

1601 Lind Avenue, SW., Renton,

Washington 98055–4056; telephone

(206) 227–2141; fax (206) 227–1149.

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