FR Doc E7-17385

[Federal Register: September 6, 2007 (Volume 72, Number 172)]
[Rules and Regulations]
[Page 51164-51167]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr06se07-3]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-27776; Directorate Identifier 2006-NM-170-AD;
Amendment 39-15189; AD 2007-18-09]
RIN 2120-AA64

Airworthiness Directives; Airbus Model A318, A319, A320, and A321
Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: The FAA is superseding an existing airworthiness directive
(AD), which applies to all Airbus Model A318-100, A319-100, A320-200,
A321-100, and A321-200 series airplanes, and Model A320-111 airplanes.
That AD currently requires an inspection to determine whether certain
braking and steering control units (BSCUs) are installed or have ever
been installed. For airplanes on which certain BSCUs are installed or
have ever been installed, the existing AD requires an inspection of the
nose landing gear (NLG) upper support, and corrective action if
necessary; and a check of the NLG strut inflation pressure, and an
adjustment if necessary. For some of these airplanes, the existing AD
also requires a revision to the aircraft flight manual to incorporate
an operating procedure to recover normal steering in the event of a
steering failure. This new AD instead requires repetitive inspections
of the NLG upper support, and related investigative/corrective actions
in accordance with new service information; and removes the one-time
inspection that was required by the existing AD. This new AD also
provides an optional terminating action for the repetitive inspections.
This AD results from a report of an incident where an airplane landed
with the NLG turned 90 degrees from centerline, and from additional
reports of NLG upper support anti-rotation lugs rupturing in service.
We are issuing this AD to prevent landings with the NLG turned 90
degrees from centerline, which could result in reduced controllability
of the airplane.

DATES: This AD becomes effective October 11, 2007.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in the AD as of October 11,
2007.
On November 30, 2005 (70 FR 70715, November 23, 2005), the Director
of the Federal Register approved the incorporation by reference of a
certain publication listed in the AD.

ADDRESSES: You may examine the AD docket on the Internet at http://dms.dot.gov
or in person at the U.S. Department of Transportation,

Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue, SE., Washington, DC.
Contact Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac Cedex,
France, for service information identified in this AD.

FOR FURTHER INFORMATION CONTACT: Tim Dulin, Aerospace Engineer,
International Branch, ANM-116, FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425)
227-2141; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION:

Examining the Docket

You may examine the airworthiness directive (AD) docket on the
Internet at http://dms.dot.gov or in person at the Docket Operations

office between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The Docket Operations office (telephone (800) 647-5527) is
located on the ground floor of the West Building at the DOT street
address stated in the ADDRESSES section.

Discussion

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to include an AD that supersedes AD 2005-24-06, amendment
39-14386 (70 FR 70715, November 23, 2005). The existing AD applies to
all Airbus Model A318-100, A319-100, A320-200, A321-100, and A321-200
series airplanes, and Model A320-111

[[Page 51165]]

airplanes. That NPRM was published in the Federal Register on April 5,
2007 (72 FR 16749). That NPRM proposed to continue to require an
inspection to determine whether certain braking and steering control
units (BSCUs) are installed or have ever been installed. For airplanes
on which certain BSCUs are installed or have ever been installed, that
NPRM proposed to continue to require a revision to the aircraft flight
manual (AFM) to incorporate an operating procedure to recover normal
steering in the event of a steering failure. That NPRM also proposed to
require repetitive inspections of the nose landing gear (NLG) upper
support, and related investigative/corrective actions, and an optional
terminating action for the repetitive inspections.

Comments

We provided the public the opportunity to participate in the
development of this AD. We have considered the comments that have been
received on the NPRM.

Support for the AD

The National Transportation Safety Board supports the adoption of
the AD.

Request To Revise ``Optional Terminating Action'' Reference

Airbus requests that we rephrase the heading of paragraph (l),
``Optional Terminating Action,'' of the NPRM. Airbus states that the
terminating action for the issue addressed by the NPRM is not yet
available. According to Airbus, the terminating action will include
implementation of a new BSCU standard, which is currently being
defined. Therefore, Airbus suggests that instead of the title
``Optional Terminating Action,'' we use a different title, such as
``Action that Renders Void the Requirements of this AD,'' or equivalent
wording. Airbus states that it is correct to say that the actions
proposed in paragraph (l) of the NPRM would render void the
requirements of this AD, and that no further action would be required
by this AD. However, the terminating action for the issue will require
installation of a new future BSCU standard. Airbus anticipates that it
will require the installation of the future BSCU standard as a
terminating action.
We disagree with the request to rephrase the title of paragraph (l)
of this AD. We consider the phrase ``Action that Renders Void the
Requirements of this AD,'' to be equivalent to the existing title
``Optional Terminating Action.'' Furthermore, this AD is fully
consistent with European Aviation Safety Agency (EASA) airworthiness
directive 2006-0174, dated June 21, 2006, which is the parallel EASA
airworthiness directive to this AD. If EASA supersedes airworthiness
directive 2006-0174 for any reason, we will consider additional
rulemaking. We have not changed the AD in this regard.

Explanation of Editorial Change to Paragraph (l)

Paragraph (l) of the NPRM referred to ``standard L4.1 and L4.5.''
That paragraph should refer to ``standard L4.1 or L4.5.'' We have
revised paragraph (l) of the final rule accordingly. This change will
not affect accomplishment of the optional terminating action.

Clarification of Alternative Method of Compliance (AMOC) Paragraph

We have revised this action to clarify the appropriate procedure
for notifying the principal inspector before using any approved AMOC on
any airplane to which the AMOC applies.

Conclusion

We have carefully reviewed the available data, including the
comments received, and determined that air safety and the public
interest require adopting the AD with the changes described previously.
We have determined that these changes will neither increase the
economic burden on any operator nor increase the scope of the AD.

Costs of Compliance

This AD affects about 720 airplanes of U.S. registry. The following
table provides the estimated costs for U.S. operators to comply with
this AD. The average labor rate is $80 per work hour.

Estimated Costs
----------------------------------------------------------------------------------------------------------------
Action Work hours Parts Cost per airplane Fleet cost
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Records review (required by AD 1.................... None $80................. $57,600.
2005-24-06).
AFM revision (required by AD 2005- 1.................... None $80................. $57,600.
24-06).
Special detailed inspection in 1.................... None $80, per inspection $57,600, per
accordance with new service cycle. inspection cycle.
information (new action).
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Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, Section 106, describes the
authority of the FAA Administrator. Subtitle VII, Aviation Programs,
describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701, ``General
requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.

Regulatory Findings

We have determined that this AD will not have federalism
implications under Executive Order 13132. This AD will not have a
substantial direct effect 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.
For the reasons discussed above, I certify that this AD:
(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) 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.
We prepared a regulatory evaluation of the estimated costs to
comply with this AD and placed it in the AD docket. See the ADDRESSES
section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

[[Page 51166]]

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The Federal Aviation Administration (FAA) amends Sec. 39.13 by
removing amendment 39-14386 (70 FR 70715, November 23, 2005) and by
adding the following new airworthiness directive (AD):

2007-18-09 AIRBUS: Amendment 39-15189. Docket No. FAA-2007-27776;
Directorate Identifier 2006-NM-170-AD.

Effective Date

(a) This AD becomes effective October 11, 2007.

Affected ADs

(b) This AD supersedes AD 2005-24-06.

Applicability

Unsafe Condition

(d) This AD results from a report of an incident where an
airplane landed with the nose landing gear (NLG) turned 90 degrees
from centerline, and from additional reports of NLG upper support
anti-rotation lugs rupturing in service. We are issuing this AD to
prevent landings with the NLG turned 90 degrees from centerline,
which could result in reduced controllability of the airplane.

Compliance

(e) You are responsible for having the actions required by this
AD performed within the compliance times specified, unless the
actions have already been done.

Restatement of Certain Requirements of AD 2005-24-06

Records Review

(f) Within 5 days after November 30, 2005 (the effective date of
AD 2005-24-06), perform a records review to determine whether the
airplane is equipped with or has ever been equipped with an enhanced
manufacturing and maintainability (EMM) braking and steering control
unit (BSCU) part number (P/N) E21327001 (standard L4.1, installed by
Airbus Modification 26965, or Airbus Service Bulletin A320-32-1912)
or P/N E21327003 (standard L4.5, installed by Airbus Modification
33376, or Airbus Service Bulletin A320-32-1261). Airbus Service
Bulletin A320-32-1310, dated February 8, 2006, is one approved
method for doing the records review.
(g) For airplanes on which a records review required by
paragraph (f) of this AD conclusively determines that the airplane
is not and never has been equipped with a BSCU P/N E21327001 or P/N
E21327003, no further action is required by this AD.

Airplane Flight Manual (AFM) Revision

(h) For airplanes that are not specified in paragraph (g) of
this AD and on which Airbus Modification 31152 has not been
incorporated in production (i.e., applicable only to aircraft with
steering powered by the green hydraulic system): Within 10 days
after November 30, 2005, revise the Limitation Section of the Airbus
A318/319/320/321 Aircraft Flight Manual (AFM) to include the
following information. This may be done by inserting a copy of this
AD into the AFM:

``The ECAM message, in case of a nose wheel steering failure,
will be worded as follows:

?>--``WHEEL N/W STRG FAULT'' for aircraft with the FWC E3 and
subsequent standards
--``WHEEL N.W. STEER FAULT'' for aircraft with the FWC E2 Standard.

[squarf] If the L/G SHOCK ABSORBER FAULT ECAM caution is
triggered at any time in flight, and the WHEEL N/W STRG FAULT ECAM
caution is triggered after the landing gear extension:
When all landing gear doors are indicated closed on
ECAM WHEEL page, reset the BSCU:

--A/SKID&N/W STRG--OFF THEN ON

If the WHEEL N/W STRG FAULT ECAM caution is no longer
displayed, this indicates a successful nose wheel re-centering and
steering recovery.

--Rearm the AUTO BRAKE, if necessary.

If the WHEEL N/W STRG FAULT ECAM caution remains
displayed, this indicates that the nose wheel steering remains lost,
and that the nose wheels are not centered.

--During landing, delay nose wheel touchdown for as long as
possible.
--Refer to the ECAM STATUS.

[squarf] If the WHEEL N/W STRG FAULT ECAM caution appears,
without the L/G SHOCK ABSORBER FAULT ECAM caution:

--No specific crew action is requested by the WHEEL N/W STRG FAULT
ECAM caution procedure.
--Refer to the ECAM STATUS.''

Note 1: When a statement identical to that in paragraph (h) of
this AD has been included in the general revisions of the AFM, the
general revisions may be inserted into the AFM, and the copy of this
AD may be removed from the AFM.

New Requirements of This AD

Inspection Thresholds

(i) For airplanes that are not specified in paragraph (g) of
this AD, at the earlier of the times specified in paragraphs (i)(1)
and (i)(2) of this AD: Do a special detailed inspection (boroscopic)
for broken or cracked NLG upper support lugs and missing cylinder
lugs, and do all applicable related investigative/corrective actions
before further flight. Do all actions in accordance with Airbus
Technical Note 957.1901/05, dated October 18, 2005; or the
Accomplishment Instructions of Airbus Service Bulletin A320-32-1310,
dated February 8, 2006. After the effective date of this AD, only
Airbus Service Bulletin A320-32-1310, dated February 8, 2006, may be
used. Where the service bulletin specifies that restoring the NLG is
necessary in accordance with Airbus recommendations, this AD
requires restoring the NLG in accordance with a method approved by
the Manager, International Branch, ANM-116, Transport Airplane
Directorate, FAA; or the European Aviation Safety Agency (EASA) (or
its delegated agent). Repeat the inspection thereafter at the
applicable interval specified in paragraph (j) or (k) of this AD.
(1) Within 100 flight cycles following an electronic centralized
aircraft monitoring (ECAM) caution ``L/G SHOCK ABSORBER FAULT''
associated with at least one of the following centralized fault
display system (CFDS) messages specified in paragraph (i)(1)(i),
(i)(1)(ii), or (i)(1)(iii) of this AD.
(i) ``N L/G EXT PROX SNSR 24GA TGT POS.''
(ii) ``N L/G EXT PROX SNSR 25GA TGT POS.''
(iii) ``N L/G SHOCK ABSORBER FAULT 2526GM.''
(2) At the later of the times specified in paragraphs (i)(2)(i)
and (i)(2)(ii) of this AD.
(i) Within 20 months, 6,000 flight hours, or 4,500 flight cycles
since the date of issuance of the original French standard
airworthiness certificate, or the original French export certificate
of airworthiness, whichever occurs first.
(ii) Within 6 months, 1,800 flight hours, or 1,350 flight cycles
after the effective date of this AD, whichever occurs first.

Repetitive Inspection Intervals

(j) For airplanes not specified in paragraph (g) of this AD that
are equipped with EMM BSCU standard L4.1 or L4.5: Repeat the
inspection specified in paragraph (i) of this AD thereafter at
intervals not to exceed the earliest of 6 months; 1,800 flight
hours; 1,350 flight cycles; or 100 flight cycles following certain
ECAM cautions and CFDS messages, as specified in paragraph (i)(1) of
this AD.
(k) For airplanes not specified in paragraph (g) of this AD that
are equipped with EMM BSCU standard L4.8 or a non-EMM BSCU: Repeat
the inspection specified in paragraph (i) of this AD thereafter at
intervals not to exceed the earliest of 20 months; 6,000 flight
hours; 4,500 flight cycles; or 100 flight cycles following certain
ECAM cautions and CFDS messages, as specified in paragraph (i)(1) of
this AD.

Note 2: For the purposes of this AD, a special detailed
inspection is: ``An intensive examination of a specific item,
installation, or assembly to detect damage, failure, or
irregularity. The examination is likely to make extensive use of
specialized inspection techniques and/or equipment. Intricate
cleaning and substantial access or disassembly procedure may be
required.''

Optional Terminating Action

(l) For airplanes that are not specified in paragraph (g) of
this AD: Installation of an NLG with new upper support anti-rotation
lugs and new cylinder lugs, or installation of an NLG that was never
driven by EMM BSCU standard L4.1 or L4.5; combined with

[[Page 51167]]

installation of an EMM BSCU standard L4.8 or a non-EMM BSCU;
constitutes terminating action for the requirements of this AD. Do
the installations in accordance with a method approved by either the
Manager, International Branch, ANM-116; or the EASA (or its
delegated agent). Chapter 32 of the Airbus A318/A319/A320/A321
Aircraft Maintenance Manual (AMM) is one approved method for doing
the installations.

No Report Required

(m) Although Airbus Service Bulletin A320-32-1310, dated
February 8, 2006, specifies sending certain inspection results to
Airbus, this AD does not include that requirement.

Credit Paragraph

(n) Inspections done before the effective date of this AD in
accordance with Chapter 12, Subject 12-14-32 of the Airbus A318/
A319/A320/A321 AMM, as revised by Airbus A318/A319/A320/A321 AMM
Temporary Revision 12-001, dated November 13, 2005, are acceptable
for compliance with the requirements of paragraph (i) of this AD.

Alternative Methods of Compliance (AMOCs)

(o)(1) The Manager, International Branch, ANM-116, has the
authority to approve AMOCs for this AD, if requested in accordance
with the procedures found in 14 CFR 39.19.
(2) To request a different method of compliance or a different
compliance time for this AD, follow the procedures in 14 CFR 39.19.
Before using any approved AMOC on any airplane to which the AMOC
applies, notify your appropriate principal inspector (PI) in the FAA
Flight Standards District Office (FSDO), or lacking a PI, your local
FSDO.

Related Information

(p) EASA airworthiness directive 2006-0174, dated June 21, 2006,
also addresses the subject of this AD.

Material Incorporated by Reference

(q) You must use Airbus Technical Note 957.1901/05, dated
October 18, 2005; or Airbus Service Bulletin A320-32-1310, dated
February 8, 2006; as applicable, to perform the actions that are
required by this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of Airbus Service Bulletin A320-32-1310,
dated February 8, 2006, in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51.
(2) On November 30, 2005 (70 FR 70715, November 23, 2005), the
Director of the Federal Register approved the incorporation by
reference of Airbus Technical Note 957.1901/05, dated October 18,
2005.
(3) Contact Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac
Cedex, France, for a copy of this service information. You may
review copies at the FAA, Transport Airplane Directorate, 1601 Lind
Avenue, SW., Renton, Washington; or at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html
.

Issued in Renton, Washington, on August 17, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-17385 Filed 9-5-07; 8:45 am]

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