Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-196-AD]

RIN 2120-AA64

Airworthiness Directives; Airbus Model A330 and A340 Series

Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness

directive (AD) that is applicable to all Airbus Model A330 and A340

series airplanes. This proposal would require repetitive detailed

visual and ultrasonic inspections of the main landing gear (MLG) to

detect fatigue cracks; and repair, if necessary. This proposal also

would require replacement of certain nose landing gear (NLG) handwheel

controllers with new controllers; replacement of certain placards with

new placards; installation of steering angle recording software;

corrective action for exceeding certain steering angles; and an AFM

revision to limit the nose wheel steering angle for pushback and towing

and to limit the nose wheel steering for powered turns. This proposal

is prompted by issuance of mandatory continuing airworthiness

information by a foreign civil airworthiness authority. The actions

specified by the proposed AD are intended to prevent MLG failure due to

fatigue cracking, which could result in reduced structural capability

of the airplane and collapse of the MLG.

DATES: Comments must be received by February 11, 2000.

ADDRESSES: Submit comments in triplicate to the Federal Aviation

Administration (FAA), Transport Airplane Directorate, ANM-114,

Attention: Rules Docket No. 99-NM-196-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 Airbus Industrie, 1 Rond Point Maurice Bellonte, 31707

Blagnac Cedex, France. This information may be examined at the FAA,

Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,

Washington.

FOR FURTHER INFORMATION CONTACT: Norman B. Martenson, Manager,

International Branch, ANM-116, FAA, Transport Airplane Directorate,

1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425)

227-2110; fax (425) 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

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 99-NM-196-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-114, Attention: Rules

Docket No. 99-NM-196-AD, 1601 Lind Avenue, SW., Renton, Washington

98055-4056.

Discussion

The Direction Generale de l'Aviation Civile (DGAC), which is the

airworthiness authority for France,

[[Page 1834]]

notified the FAA that an unsafe condition may exist on all Airbus Model

A330 and A340 series airplanes. The DGAC advises that a right main

landing gear (MLG) of a Model A340 failed during landing. Investigation

revealed a fatigue crack had initiated in the upper part of the MLG

main fitting cylindrical barrel. This fatigue crack is a result of

repetitive loading during high steering and/or towing angles when

turning. This condition, if not corrected, could result in MLG failure

due to fatigue cracking, which could result in reduced structural

capability of the airplane and collapse of the MLG.

Explanation of Relevant Service Information

Airbus has issued Service Bulletin A330-32A3088, Revision 02, dated

June 10, 1999 (for Model A330 series airplanes), and Service Bulletin

A340-32A4124, Revision 01, dated November 20, 1998, which describe

procedures for repetitive detailed visual and ultrasonic inspection of

the MLG to detect fatigue cracks; and corrective actions, if necessary.

The corrective actions involve a detailed magnetic particle inspection

of the MLG to detect fatigue cracks, and repair, if necessary.

Airbus also has issued Service Bulletin A330-32-3089, dated

November 2, 1998 (for Model A330 series airplanes), and Service

Bulletin Service Bulletin A340-32-4126, dated November 2, 1998 (for

Model A340 series airplanes), which describe procedures for replacement

of placards on the left-and right-hand sides of the aft mechanically-

operated nose landing gear doors with new placards.

Airbus also has issued Flight Operations TELEX (FOT) 999.0099/98,

Revision 5, dated May 21, 1999, which describes procedures for revising

the procedures of the Flight Crew Operating Manual to limit the nose

wheel steering angle for pushback and towing and to limit the nose

wheel steering for powered turns.

Airbus also has issued Service Bulletin A330-32-3091, Revision 01,

dated December 2, 1998 (for Model A330 series airplanes), and Service

Bulletin A340-32-4128, Revision 01, dated December 2, 1998 (for Model

A340 series airplanes), which describe procedures for replacement of

nose wheel steering controllers with new controllers.

In addition, Airbus has issued Service Bulletin A330-32-3092,

Revision 02, dated June 10, 1999 (for Model A330 series airplanes), and

Service Bulletin A340-32-4131, Revision 01, dated June 10, 1999 (for

Model A340 series airplanes), which describe procedures for

modification of the functional software of the brake steering and

control unit (BSCU). This modification can be utilized as an

alternative for the replacement of the nose wheel steering controllers

recommended by Airbus Service Bulletin A330-32-3091, Revision 01, dated

December 2, 1998 (for Model A330 series airplanes), and Service

Bulletin A340-32-4128, Revision 01, dated December 2, 1998 (for Model

A340 series airplanes).

Airbus also has issued Service Bulletin A330-31-3033, dated

September 13, 1999 (for Model A330 series airplanes), and Service

Bulletin A340-31-4047, dated September 13, 1999 (for Model A340 series

airplanes), which describe procedures for installation of a software

program that automatically records all nose wheel steering angle

exceedance above 63 degrees into the Aircraft Condition Monitoring

System (ACMS). This installation includes modification of the new setup

database software by adding the existing operator customized version;

and uploading the setup database software to the data management unit

(DMU).

Accomplishment of the actions specified in the service information

is intended to adequately address the identified unsafe condition. The

DGAC classified this service information as mandatory and issued French

airworthiness directives 1998-475-103(B)R1, 1998-473-083(B)R1, and

1999-160-096(B); all dated April 21, 1999; in order to assure the

continued airworthiness of these airplanes in France.

FAA's Conclusions

These airplane models are manufactured in France and are type

certificated for operation in the United States under the provisions of

Sec. 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the

applicable bilateral airworthiness agreement. Pursuant to this

bilateral airworthiness agreement, the DGAC has kept the FAA informed

of the situation described above. The FAA has examined the findings of

the DGAC, 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.

Explanation of Requirements of Proposed Rule

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 accomplishment of

the actions specified in the service information described previously,

except as discussed below. The proposed AD also would require that

operators report results of inspection findings to Airbus.

Differences Between Proposed Rule, Service Bulletins, and French

Airworthiness Directives

Operators should note that, although the service bulletins and the

French airworthiness directives specify that the manufacturer may be

contacted for disposition of certain repair conditions, this proposal

would require the repair of those conditions to be accomplished in

accordance with a method approved by the FAA or the DGAC (or its

delegated agent).

Operators should also note that the parallel French airworthiness

directives require a revision of the Flight Crew Operating Manual

(FCOM) to limit the nose wheel steering angle for pushback and towing

and to limit the nose wheel steering for powered turns. However, for

U.S. operators, the FCOM is not approved and required by the FAA,

whereas the Airplane Flight Manual is approved and required by the FAA.

Therefore, the proposed AD would require a revision to the AFM instead

of a revision to the FCOM.

Cost Impact

None of the airplanes affected by this action are on the U.S.

Register. All airplanes included in the applicability of this rule

currently are operated by non-U.S. operators under foreign registry;

therefore, they are not directly affected by this AD action. However,

the FAA considers that this rule is necessary to ensure that the unsafe

condition is addressed in the event that any of these subject airplanes

are imported and placed on the U.S. Register in the future.

Should an affected airplane be imported and placed on the U.S.

Register in the future, it would require approximately 1 work hour to

accomplish the proposed inspection of the required main landing gear;

approximately 7 work hours to accomplish the proposed replacement of

the controller; approximately 1 work hour to accomplish the proposed

placard replacements; approximately 1 work hour to accomplish the

proposed installation of the software program; and approximately 1 work

hour to accomplish the proposed AFM revision; at an average labor rate

of $60 per work hour. The manufacturer has previously committed to

bearing the cost of the necessary parts to accomplish the proposed

actions. Based on these figures, the cost impact of this AD

[[Page 1835]]

would be $60 per airplane, per inspection cycle, and $600 per airplane

for the remaining actions.

Should an operator elect to accomplish the modification of the

functional software of the brake steering and control unit (BSCU)

instead of replacing the nose wheel steering handwheel controllers with

new controllers, the modification would take approximately 1 work hour

to accomplish. Based on this figure, the cost impact of the optional

modification would be $60 per airplane.

The cost impact figures discussed above are 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.

Regulatory Impact

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.

Sec. 39.13 [Amended]

2. Section 39.13 is amended by adding the following new

airworthiness directive:

Airbus Industrie: Docket 99-NM-196-AD.

Applicability: All Model A330 and A340 series airplanes,

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 request approval for an

alternative method of compliance in accordance with paragraph (k) of

this AD. The request should include an assessment of the effect of

the modification, alteration, or repair on the unsafe condition

addressed by this AD; and, if the unsafe condition has not been

eliminated, the request should include specific proposed actions to

address it.

Compliance: Required as indicated, unless accomplished

previously.

To prevent main landing gear (MLG) failure due to fatigue

cracking, which could result in reduced structural capability of the

airplane and collapse of the MLG, accomplish the following:

Inspection of the MLG

(a) Prior to the accumulation of 800 total landings on the MLG,

or within 120 landings after the effective date of this AD,

whichever occurs later, perform detailed visual and ultrasonic

inspections of the MLG to detect fatigue cracks, as specified in

either paragraph (a)(1) or (a)(2) of this AD, as applicable.

(1) For Model A330 series airplanes: Accomplish the detailed

visual and ultrasonic inspections, in accordance with Airbus Service

Bulletin A330-32A3088, Revision 02, dated June 10, 1999.

Note 2: For the purposes of this AD, a detailed visual

inspection is defined as: ``An intensive visual examination of a

specific structural area, system, installation, or assembly to

detect damage, failure, or irregularity. Available lighting is

normally supplemented with a direct source of good lighting at

intensity deemed appropriate by the inspector. Inspection aids such

as mirror, magnifying lenses, etc., may be used. Surface cleaning

and elaborate access procedures may be required.''

Note 3: Detailed visual and ultrasonic inspections accomplished

prior to the effective date of this AD in accordance with Airbus

Service Bulletin A330-32A3088, dated October 16, 1998; or Revision

01, dated November 20, 1998; are acceptable methods of compliance

for the inspection requirements of paragraph (a)(1) of this AD.

(2) For Model A340 series airplanes: Accomplish the detailed

visual and ultrasonic inspections in accordance with Airbus Service

Bulletin A340-32A4124, Revision 01, dated November 20, 1998.

Note 4: Detailed visual and ultrasonic inspections accomplished

prior to the effective date of this AD in accordance with Airbus

Service Bulletin A340-32A4124, dated October 16, 1998, are

acceptable methods of compliance for the inspection requirements of

paragraph (a)(2) of this AD.

Repetitive Inspections

(b) If no crack is detected during the inspection required by

paragraph (a)(1) or (a)(2) of this AD: Repeat the detailed visual

and ultrasonic inspections thereafter at intervals not to exceed 120

landings.

Corrective Actions

(c) If any cracking is detected during any inspection required

by paragraph (a) or (b) of this AD: Prior to further flight, perform

a detailed magnetic particle inspection of the MLG to detect fatigue

cracks, in accordance with Airbus Service Bulletin A330-32A3088,

Revision 02, dated June 10, 1999, or Airbus Service Bulletin A340-

32A4124, Revision 01, dated November 20, 1998, as applicable; and

repair in accordance with a method approved by the Manager,

International Branch, ANM-116, FAA, Transport Airplane Directorate,

or the Direction Generale de l'Aviation Civile (DGAC) (or its

delegated agent). For a repair method to be approved by the Manager,

International Branch, ANM-116, as required by this paragraph, the

Manager's approval letter must specifically reference this AD.

Reporting

(d) Within 10 days after accomplishing any inspection required

by paragraph (a), (b) or (c) of this AD, report the inspection

results (both positive and negative) to Airbus Industrie at fax

33(0) 5 61 93 32 73. Information collection requirements contained

in this regulation have been approved by the Office of Management

and Budget (OMB) under the provisions of the Paperwork Reduction Act

of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control

Number 2120-0056.

Replacement of Nose Wheel Steering Handwheel Controllers or Software

Modification

(e) Within 20 days after the effective date of this AD, replace

the nose wheel steering handwheel controllers with new controllers,

or modify the functional software of the brake steering and control

unit (BSCU), as specified in either paragraph (e)(1) or (e)(2) of

this AD, as applicable.

(1) For Model A330 series airplanes: Replace the controllers in

accordance with Airbus Service Bulletin A330-32-3091, Revision 01,

dated December 2, 1998, or modify the functional software of the

BSCU in accordance with Airbus Service Bulletin A330-32-3092,

Revision 02, dated June 10, 1999.

Note 5: Replacement of nose wheel steering handwheel controllers

with new controllers accomplished prior to the effective date of

this AD in accordance with Airbus Service

[[Page 1836]]

Bulletin A330-32-3091, dated November 19, 1998, is an acceptable

method of compliance for the replacement requirements of paragraph

(e)(1) of this AD.

Note 6: Modification of the functional software of the BSCU

accomplished prior to the effective date of this AD in accordance

with Airbus Service Bulletin A330-32-3092, dated December 18, 1998;

or Revision 01, dated February 24, 1999; is an acceptable method of

compliance for the software modification requirements of paragraph

(e)(1) of this AD.

(2) For Model A340 series airplanes: Replace the controllers in

accordance with Airbus Service Bulletin A340-32-4128, Revision 01,

dated December 2, 1998, or modify the functional software of the

BSCU in accordance with Airbus Service Bulletin A340-32-4131,

Revision 01, dated June 10, 1999.

Note 7: Replacement of nose wheel steering handwheel controllers

with new controllers accomplished prior to the effective date of

this AD in accordance with Airbus Service Bulletin A340-32-4128,

dated November 19, 1998, is an acceptable method of compliance for

the replacement requirements of paragraph (e)(2) of this AD.

Note 8: Modification of the functional software of the BSCU

accomplished prior to the effective date of this AD in accordance

with Airbus Service Bulletin A340-32-4131, dated February 24, 1999,

is an acceptable method of compliance for the software modification

requirements of paragraph (e)(2) of this AD.

Replacement of Placards on Mechanically-Operated Nose Landing Gear

Doors

(f) Within 20 days after the effective date of this AD, replace

the placards on the left-and right-hand sides of the aft

mechanically-operated nose landing gear doors with new placards, as

specified in either paragraph (f)(1) or (f)(2) of this AD, as

applicable.

(1) For Model A330 series airplanes: Replace placards in

accordance with Airbus Service Bulletin A330-32-3089, dated November

2, 1998.

(2) For Model A340 series airplanes: Replace placards in

accordance with Airbus Service Bulletin A340-32-4126, dated November

2, 1998.

Installation of a Software Program

(g) Within 20 days after the effective date of this AD,

accomplish either paragraph (g)(1) or (g)(2) of this AD, as

applicable.

(1) For Model A330-200 series airplanes: Install a software

program that automatically records all nose wheel steering angle

exceedance above 63 degrees into the Aircraft Condition Monitoring

System (ACMS) [i.e., modify the new setup database software by

adding the existing operator customized version; and upload the

setup database software to the data management unit (DMU)] in

accordance with Airbus Service Bulletin A330-31-3033, dated

September 13, 1999.

(2) For Model A330-300 and Model A340 series airplanes: Install

a software program that automatically records all nose wheel

steering angle exceedance above 67 degrees into the ACMS (i.e.

modify the new setup database software by adding the existing

operator customized version; and upload the setup database software

to the DMU) in accordance with Airbus Service Bulletin A330-31-3033,

dated September 13, 1999 (for Model A330-300 series airplanes), or

Airbus Service Bulletin A340-31-4047, dated September 13, 1999 (for

Model A340 series airplanes); as applicable.

Incorporation of Ground and Crew Operating Procedures

(h) Within 20 days after the effective date of this AD, revise

the Limitations Section of the FAA-approved Airplane Flight Manual

(AFM) by inserting the procedures to incorporate ground operating

procedures to limit the nose wheel steering angle for pushback and

towing and to limit nose wheel steering for powered turns, in

accordance with Flight Operations TELEX (FOT) 999.0099/98, Revision

5, dated May 21, 1999.

Corrective Actions for Exceedance of Nose Wheel Steering Angle

(i) For Model A330-200 series airplanes: If after 20 days from

the effective date of this AD, a 63-degree hand wheel steering is

exceeded, a 63 degrees is recorded on the ACMS, or a 60-degree

steering is exceeded during towing or pushback, within 4 landings

after each occurrence, accomplish the actions required by paragraph

(a) of this AD.

(j) For Model A330-300 and Model A340 series airplanes: If after

20 days from the effective date of this AD, a 65-degree hand wheel

steering is exceeded, a 67 degrees is recorded on the ACMS, or a 60-

degree steering is exceeded during towing or pushback; within 4

landings after each occurrence, accomplish paragraph (j)(1) and

(j)(2) of this AD, as applicable.

(1) Accomplish the actions required by paragraph (a) of this AD.

(2) For airplanes on which Airbus Modification 46804 has been

accomplished: Reinstall a positive stop and re-rig the tiller as

specified in either paragraph (j)(2)(i) or (j)(2)(ii) of this AD, as

applicable.

(i) For Model A330-300 series airplanes: Reinstall a stop and

re-rig in accordance with Airbus Service Bulletin A330-32-3091,

Revision 01, dated December 2, 1998.

(ii) For Model A340 series airplanes: Reinstall a stop and re-

rig in accordance with Airbus Service Bulletin A340-32-4128,

Revision 01, dated December 2, 1998.

Alternative Methods of Compliance

(k) 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, International Branch, ANM-116.

Operators shall submit their requests through an appropriate FAA

Principal Maintenance Inspector, who may add comments and then send

it to the Manager, International Branch, ANM-116.

Note 9: Information concerning the existence of approved

alternative methods of compliance with this AD, if any, may be

obtained from the International Branch, ANM-116.

Special Flight Permits

(l) Special flight permits may be issued in accordance with

Secs. 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.

Note 10: The subject of this AD is addressed in French

airworthiness directives 1998-475-103(B)R1; 1998-473-083(B)R1; and

1999-160-096(B); all dated April 21, 1999.

Issued in Renton, Washington, on January 5, 2000.

Donald L. Riggin,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 00-600 Filed 1-11-00; 8:45 am]

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