27414 Federal Register / Vol. 75, No. 94 / Monday, May 17, 2010 / Rules and Regulations 

Issued in Burlington, Massachusetts, on 

April 28, 2010. 

Peter A. White, 

Assistant Manager, Engine and Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. 2010–10720 Filed 5–14–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0129; Directorate 

Identifier 2009–NM–245–AD; Amendment 

39–16287; AD 2010–10–08] 

RIN 2120–AA64 

Airworthiness Directives; Airbus A318, 

A319, A320, A321 Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for the 

products listed above. This AD results 

from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI describes the unsafe 

condition as: 

Several occurrences of loss of the AC 

[alternating current] BUS 1 have been 

reported which led in some instances to the 

loss of the AC ESS [essential] BUS and DC 

[direct current] ESS BUS and connected 

systems. The affected systems include 

multiple flight deck Display Units (Primary 

Flight Display, Navigation Display and Upper 

Electronic Centralised Aircraft Monitoring 

display). 

* * * * * 

The loss of multiple display units, if not 

corrected expediently during a high 

workload period, potentially affects the 

capability of the flight crew and could 

contribute to a loss of situational awareness 

and consequent control of the aeroplane, 

which would constitute an unsafe condition. 

* * * * * 

We are issuing this AD to require 

actions to correct the unsafe condition 

on these products. 

DATES: This AD becomes effective June 

21, 2010. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of June 21, 2010. 

ADDRESSES: You may examine the AD 

docket on the Internet at http:// 

www.regulations.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. 

FOR FURTHER INFORMATION CONTACT: Tim 

Dulin, Aerospace Engineer, 

International Branch, ANM–116, 

Transport Airplane Directorate, FAA, 

1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 227–2141; fax (425) 227–1149. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an AD that would 

apply to the specified products. That 

NPRM was published in the Federal 

Register on February 23, 2010 (75 FR 

8003). That NPRM proposed to correct 

an unsafe condition for the specified 

products. The MCAI states: 

Several occurrences of loss of the AC 

[alternating current] BUS 1 have been 

reported which led in some instances to the 

loss of the AC ESS [essential] BUS and DC 

[direct current] ESS BUS and connected 

systems. The affected systems include 

multiple flight deck Display Units (Primary 

Flight Display, Navigation Display and Upper 

Electronic Centralised Aircraft Monitoring 

display). 

The reasons for these events have been 

investigated but have not been fully 

established for all cases. 

Due to the range of system losses some 

crews reported difficulty in establishing the 

failure cause during the events and, 

consequently, the appropriate actions to be 

taken may not be completed in a timely 

manner. 

The loss of multiple display units, if not 

corrected expediently during a high 

workload period, potentially affects the 

capability of the flight crew and could 

contribute to a loss of situational awareness 

and consequent control of the aeroplane, 

which would constitute an unsafe condition. 

This AD therefore mandates the 

modification of the electrical network 

configuration management logic consisting in 

adding an automatic switching of the AC and 

DC ESS BUS power supply such that upon 

the loss of the AC BUS 1, the AC BUS 2 will 

automatically take over the power supply. On 

pre-MOD aeroplanes, this power supply 

switching can only be accomplished 

manually from the cockpit and is covered by 

an Electronic Centralized Aircraft Monitoring 

(ECAM) procedure. 

The modification of the electrical power 

distribution system includes, depending 

on the configuration, adding a new 

circuit breaker and new relay to the AC/ 

DC ESS BUS circuit, and adding a diode 

between a certain relay and terminal 

block. You may obtain further 

information by examining the MCAI in 

the AD docket. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

considered the comment received. 

Support and Request to Reduce 

Compliance Time 

The Airline Pilots Association, 

International (ALPA) supports this AD, 

and asks that the 48-month compliance 

time proposed in the NPRM be reduced 

to 24 months. ALPA states that, given 

the potentially serious consequences of 

the flightcrew experiencing a very high 

workload during a critical phase of 

flight, the compliance time should be 

reduced based on the number of events 

and the safety risk associated with BUS 

failures. 

We do not agree that the compliance 

time should be reduced. In developing 

the compliance time for this AD action, 

we considered not only the safety 

implications of the identified unsafe 

condition, but the average utilization 

rate of the affected fleet, the practical 

aspects of modifying the fleet during the 

compliance time, and the availability of 

required parts. In addition, we have 

coordinated with the European Aviation 

Safety Agency (EASA), which is the 

Technical Agent for the Member States 

of the European Community. We have 

determined that the 48-month 

compliance time to do the modification 

addresses the identified unsafe 

condition and ensures an adequate level 

of safety for the affected fleet. We have 

made no change to the AD in this 

regard. 

Conclusion 

We reviewed the available data, 

including the comment received, and 

determined that air safety and the 

public interest require adopting the AD 

as proposed. 

Differences Between This AD and the 

MCAI or Service Information 

We have reviewed the MCAI and 

related service information and, in 

general, agree with their substance. But 

we might have found it necessary to use 

different words from those in the MCAI 

to ensure the AD is clear for U.S. 

operators and is enforceable. In making 

these changes, we do not intend to differ 

substantively from the information 

provided in the MCAI and related 

service information. 

We might also have required different 

actions in this AD from those in the 

MCAI in order to follow our FAA 

policies. Any such differences are 

highlighted in a NOTE within the AD. 


srobinson on DSKHWCL6B1PROD with RULES
Federal Register / Vol. 75, No. 94 / Monday, May 17, 2010 / Rules and Regulations 27415 

Costs of Compliance 

We estimate that this AD will affect 

633 products of U.S. registry. We also 

estimate that it will take about 46 workhours per product to comply with the 

basic requirements of this AD. The 

average labor rate is $85 per work-hour. 

Required parts will cost about $2,200 

per product. Where the service 

information lists required parts costs 

that are covered under warranty, we 

have assumed that there will be no 

charge for these parts. As we do not 

control warranty coverage for affected 

parties, some parties may incur costs 

higher than estimated here. Based on 

these figures, we estimate the cost of 

this AD to the U.S. operators to be 

$3,867,630, or $6,110 per product. 

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 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 this AD: 

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. 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. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Operations office between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. The AD docket 

contains the NPRM, the regulatory 

evaluation, any comments received, and 

other information. The street address for 

the Docket Operations office (telephone 

(800) 647–5527) is in the ADDRESSES

section. Comments will be available in 

the AD docket shortly after receipt. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

Adoption of the Amendment 

■ Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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. The FAA amends § 39.13 by adding 

the following new AD: 

2010–10–08 Airbus: Amendment 39–16287. 

Docket No. FAA–2010–0129; Directorate 

Identifier 2009–NM–245–AD. 

Effective Date 

(a) This airworthiness directive (AD) 

becomes effective June 21, 2010. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Airbus Model A318– 

111, –112, –121, and –122 airplanes; Model 

A319–111, –112, –113, –114, –115, –131, 

–132, and –133 airplanes; Model A320–111, 

–211, –212, –214, –231, –232, and –233 

airplanes; and Model A321–111, –112, –131, 

–211, –212, –213, –231, and –232 airplanes; 

certificated in any category; all manufacturer 

serial numbers; except airplanes that have 

received Airbus modification 37317 in 

production. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 24: Electrical power. 

Reason 

(e) The mandatory continuing 

airworthiness information (MCAI) states: 

Several occurrences of loss of the AC 

[alternating current] BUS 1 have been 

reported which led in some instances to the 

loss of the AC ESS [essential] BUS and DC 

[direct current] ESS BUS and connected 

systems. The affected systems include 

multiple flight deck Display Units (Primary 

Flight Display, Navigation Display and Upper 

Electronic Centralised Aircraft Monitoring 

display). 

The reasons for these events have been 

investigated but have not been fully 

established for all cases. 

Due to the range of system losses some 

crews reported difficulty in establishing the 

failure cause during the events and, 

consequently, the appropriate actions to be 

taken may not be completed in a timely 

manner. 

The loss of multiple display units, if not 

corrected expediently during a high 

workload period, potentially affects the 

capability of the flight crew and could 

contribute to a loss of situational awareness 

and consequent control of the aeroplane, 

which would constitute an unsafe condition. 

This AD therefore mandates the 

modification of the electrical network 

configuration management logic consisting in 

adding an automatic switching of the AC and 

DC ESS BUS power supply such that upon 

the loss of the AC BUS 1, the AC BUS 2 will 

automatically take over the power supply. On 

pre-MOD aeroplanes, this power supply 

switching can only be accomplished 

manually from the cockpit and is covered by 

an Electronic Centralized Aircraft Monitoring 

(ECAM) procedure. 

The modification of the electrical power 

distribution system includes, depending on 

the configuration, adding a new circuit 

breaker and new relay to the AC/DC ESS BUS 

circuit, and adding a diode between a certain 

relay and terminal block. 

Compliance 

(f) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Actions 

(g) Within 48 months after the effective 

date of this AD, modify the electrical power 

distribution system, in accordance with the 

Accomplishment Instructions of Airbus 

Service Bulletin A320–24–1120, Revision 03, 

dated July 10, 2009. 

(h) Actions accomplished before the 

effective date of this AD, in accordance with 

any service bulletin identified in Table 1 of 

this AD, are considered acceptable for 

compliance with the corresponding actions 

specified in this AD. 


srobinson on DSKHWCL6B1PROD with RULES
27416 Federal Register / Vol. 75, No. 94 / Monday, May 17, 2010 / Rules and Regulations 

TABLE 1—CREDIT SERVICE INFORMATION

Airbus Service Bulletin— Revision— Dated— 

A320–24–1120 ..................................................................................................................................... Original .................... May 31, 2007. 

A320–24–1120 ..................................................................................................................................... 01 ............................ December 19, 2007. 

A320–24–1120 ..................................................................................................................................... 02 ............................ July 8, 2008. 

FAA AD Differences 

Note 1: This AD differs from the MCAI 

and/or service information as follows: 

No differences. 

Other FAA AD Provisions 

(i) The following provisions also apply to 

this AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Branch, ANM–116, Transport Airplane 

Directorate, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

Send information to Attn: Tim Dulin, 

Aerospace Engineer, International Branch, 

ANM–116, Transport Airplane Directorate, 

FAA, 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone (425) 

227–2141; fax (425) 227–1149. Before using 

any approved AMOC on any airplane to 

which the AMOC applies, notify your 

principal maintenance inspector (PMI) or 

principal avionics inspector (PAI), as 

appropriate, or lacking a principal inspector, 

your local Flight Standards District Office. 

The AMOC approval letter must specifically 

reference this AD. 

(2) Airworthy Product: For any requirement 

in this AD to obtain corrective actions from 

a manufacturer or other source, use these 

actions if they are FAA-approved. Corrective 

actions are considered FAA-approved if they 

are approved by the State of Design Authority 

(or their delegated agent). You are required 

to assure the product is airworthy before it 

is returned to service. 

(3) Reporting Requirements: For any 

reporting requirement in this AD, under the 

provisions of the Paperwork Reduction Act 

(44 U.S.C. 3501 et seq.), the Office of 

Management and Budget (OMB) has 

approved the information collection 

requirements and has assigned OMB Control 

Number 2120–0056. 

Related Information 

(j) Refer to MCAI European Aviation Safety 

Agency (EASA) Airworthiness Directive 

2009–0235, dated October 29, 2009; and 

Airbus Service Bulletin A320–24–1120, 

Revision 03, dated July 10, 2009; for related 

information. 

Material Incorporated by Reference 

(k) You must use Airbus Service Bulletin 

A320–24–1120, Revision 03, dated July 10, 

2009, to do the actions required by this AD, 

unless the AD specifies otherwise. 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

this service information under 5 U.S.C. 

552(a) and 1 CFR part 51. 

(2) For service information identified in 

this AD, contact Airbus, Airworthiness 

Office—EAS, 1 Rond Point Maurice Bellonte, 

31707 Blagnac Cedex, France; telephone +33 

5 61 93 36 96; fax +33 5 61 93 44 51; e-mail: 

account.airworth-eas@airbus.com; Internet 

http://www.airbus.com. 

(3) You may review copies of the service 

information at the FAA, Transport Airplane 

Directorate, 1601 Lind Avenue, SW., Renton, 

Washington. For information on the 

availability of this material at the FAA, call 

425–227–1221. 

(4) You may also review copies of the 

service information that is incorporated by 

reference 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/ 

code_of_federal_regulations/ 

ibr_locations.html. 

Issued in Renton, Washington, on April 27, 

2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–10722 Filed 5–14–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0792; Directorate 

Identifier 2009–NM–057–AD; Amendment 

39–16300; AD 2010–10–21] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Model CL–600–2C10 (Regional Jet 

Series 700, 701, & 702) Airplanes, 

Model CL–600–2D15 (Regional Jet 

Series 705) Airplanes, and Model CL– 

600–2D24 (Regional Jet Series 900) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for the 

products listed above. This AD results 

from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI describes the unsafe 

condition as: 

Bombardier Aerospace has completed a 

system safety review of the CL–600–2C10/ 

CL600–2D15/CL–600–2D24 aircraft fuel 

system against the new fuel tank safety 

standards, introduced in Chapter 525 of the 

Airworthiness Manual through Notice of 

Proposed Amendment (NPA) 2002–043. The 

identified non-compliances were assessed 

using Transport Canada Policy Letter No. 

525–001 to determine if mandatory corrective 

action was required. 

The assessment showed that certain 

hydraulic system failure scenarios could lead 

to a rapid overheat in the hydraulic lines 

without giving flight crew sufficient time to 

react before the No. 1 and No. 2 hydraulic 

system tubing inside the fuel tank reaches the 

fuel auto ignition temperature. This could 

result in a fuel tank explosion. 

* * * * * 

We are issuing this AD to require 

actions to correct the unsafe condition 

on these products. 

DATES: This AD becomes effective June 

21, 2010. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of June 21, 2010. 

ADDRESSES: You may examine the AD 

docket on the Internet at http:// 

www.regulations.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. 

FOR FURTHER INFORMATION CONTACT: 

Christopher Alfano, Aerospace 

Engineer, Airframe and Propulsion 

Branch, ANE–171, FAA, New York 

Aircraft Certification Office, 1600 

Stewart Avenue, Suite 410, Westbury, 

New York 11590; telephone (516) 228– 

7340; fax (516) 794–5531. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an AD that would 

apply to the specified products. That 

NPRM was published in the Federal 

Register on September 28, 2009 (74 FR 

49346). That NPRM proposed to correct 

an unsafe condition for the specified 

products. The MCAI states: 

Bombardier Aerospace has completed a 

system safety review of the CL–600–2C10/ 

CL600–2D15/CL–600–2D24 aircraft fuel 

system against the new fuel tank safety 


srobinson on DSKHWCL6B1PROD with RULES