Federal Register / Vol. 78, No. 156 / Tuesday, August 13, 2013 / Proposed Rules 49237 

(e) Reason 

This AD was prompted by a report of the 

propeller pitch control (PPC) lever becoming 

disconnected from the engine due to a 

missing bolt. We are issuing this AD to 

prevent PPC shaft disconnection, which 

could lead to a loss of propeller pitch control, 

possibly resulting in uncommanded change 

to the engine power settings and consequent 

reduced controllability of the airplane. 

(f) Compliance 

You are responsible for having the actions 

required by this AD performed within the 

compliance times specified, unless the 

actions have already been done. 

(g) Modification 

Within 24 months after the effective date 

of this AD, modify the propeller pitch control 

(PCC) lever attachment system of the aircraft 

engine, in accordance with the 

Accomplishment Instructions of EADS– 

CASA Service Bulletin SB–212–76–0009, 

Revision 1, dated August 03, 2012. 

Note 1 to paragraph (g) of this AD: EADS– 

CASA Service Bulletin SB–212–76–0009, 

Revision 1, dated August 03, 2012, refers to 

Honeywell Service Bulletin TPE331–72– 

2190, dated December 21, 2011, as an 

additional source of guidance for modifying 

the cam assembly. 

(h) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, ANM–116, 

International Branch, Transport Airplane 

Directorate, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the International Branch, send it to ATTN: 

Shahram Daneshmandi, Aerospace Engineer, 

International Branch, ANM–116, Transport 

Airplane Directorate, FAA, 1601 Lind 

Avenue SW., Renton, Washington 98057– 

3356; telephone (425) 227–1112; fax (425) 

227–1149. Information may be emailed to: 

9-ANM-116-AMOC-REQUESTS@faa.gov. 

Before using any approved AMOC, notify 

your appropriate principal inspector, or 

lacking a principal inspector, the manager of 

the local flight standards district office/ 

certificate holding 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. 

(i) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) EASA 

Airworthiness Directive 2012–0251, dated 

November 27, 2012 and EADS–CASA Service 

Bulletin SB–212–76–0009, Revision 1, dated 

August 03, 2012, for related information. 

(2) For EADS–CASA service information 

identified in this AD, contact EADS–CASA, 

Military Transport Aircraft Division (MTAD), 

Integrated Customer Services (ICS), 

Technical Services, Avenida de Arago ́n 404, 

28022 Madrid, Spain; telephone +34 91 585 

55 84; fax +34 91 585 55 05; email 

MTA.TechnicalService@casa.eads.net; 

Internet http://www.eads.net. For Honeywell 

service information identified in this AD, 

contact Honeywell International Inc., 111 S. 

34th Street, Phoenix, AZ 85034–2802; Web 

site: http://portal.honeywell.com; or call 

Honeywell toll free at phone: 800–601–3099 

(U.S./Canada) or 602–365–3099 

(International Direct). You may review copies 

of the referenced service information at the 

FAA, Transport Airplane Directorate, 1601 

Lind Avenue SW., Renton, WA. For 

information on the availability of this 

material at the FAA, call 425–227–1221. 

Issued in Renton, Washington, on August 

1, 2013. 

Jeffrey E. Duven, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2013–19535 Filed 8–12–13; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0673; Directorate 

Identifier 2013–NM–057–AD] 

RIN 2120–AA64 

Airworthiness Directives; the Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 707 

airplanes; and Model 720 and 720B 

series airplanes. This proposed AD was 

prompted by reports indicating that a 

standard access door was located where 

an impact-resistant access door was 

required, and stencils were missing 

from some impact-resistant access 

doors. This proposed AD would require 

an inspection of the left- and right-hand 

wing fuel tank access doors to 

determine that impact-resistant access 

doors are installed in the correct 

locations, and to replace any door with 

an impact-resistant access door if 

necessary. This proposed AD also 

would require an inspection for stencils 

and index markers on impact-resistant 

access doors, and application of new 

stencils or index markers if necessary. 

This proposed AD would also require 

revising the maintenance program to 

incorporate changes to the airworthiness 

limitations section. We are proposing 

this AD to prevent foreign object 

penetration of the fuel tank, which 

could cause a fuel leak near an ignition 

source (e.g., hot brakes or engine 

exhaust nozzle), consequently leading to 

a fuel-fed fire. 

DATES: We must receive comments on 

this proposed AD by September 27, 

2013. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P. O. Box 3707, 

MC 2H–65, Seattle, WA 98124–2207; 

telephone 206–544–5000, extension 1; 

fax 206–766–5680; Internet https:// 

www.myboeingfleet.com. You may 

review copies of the referenced service 

information at the FAA, Transport 

Airplane Directorate, 1601 Lind Avenue 

SW., Renton, WA. For information on 

the availability of this material at the 

FAA, call 425–227–1221. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Management Facility between 9 

a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(phone: 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Suzanne Lucier, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, WA 

98057–3356; phone: 425–917–6438; fax: 


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49238 Federal Register / Vol. 78, No. 156 / Tuesday, August 13, 2013 / Proposed Rules 

425–917–6590; email: 

suzanne.lucier@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposal. Send your comments to 

an address listed under the ADDRESSES

section. Include ‘‘Docket No. FAA– 

2013–0673; Directorate Identifier 2013– 

NM–057–AD’’ at the beginning of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

We received reports indicating that a 

standard access door was located where 

an impact-resistant access door was 

required, and stencils were missing 

from some impact-resistant access 

doors. This condition, if not corrected, 

could result in foreign object 

penetration of the fuel tank, which 

could cause a fuel leak near an ignition 

source (e.g., hot brakes or engine 

exhaust nozzle), consequently leading to 

a fuel-fed fire. 

Relevant Service Information 

We reviewed Boeing Service Bulletin 

707–3532, dated January 12, 2012; and 

critical design configuration control 

limitations (CDCCL) Task 57–AWL–01, 

Impact-Resistant Fuel Tank Access 

Doors, of Subsection B, Airworthiness 

Limitations (AWLs) of Section B, of the 

Boeing 707/720 Airworthiness 

Limitations (AWLs) Document D6– 

7552–AWL, Revision September 2012. 

For information on the procedures and 

compliance times, see this service 

information at http:// 

www.regulations.gov by searching for 

Docket No. FAA–2013–0673. 

FAA’s Determination 

We are proposing this AD because we 

evaluated all the relevant information 

and determined the unsafe condition 

described previously is likely to exist or 

develop in other products of these same 

type designs. 

Proposed AD Requirements 

The FAA issued section 121.316 of 

the Federal Aviation Regulations (14 

CFR 121.316) requiring that each 

turbine powered transport category 

airplane meet the requirements of 

section 25.963(e) of the Federal Aviation 

Regulations (14 CFR 25.963(e)). Section 

25.963(e) outlines the certification 

requirements for fuel tank access covers 

on turbine powered transport category 

airplanes. 

This proposed AD would require 

inspecting fuel tank access doors to 

determine that impact-resistant access 

doors are installed in the correct 

locations and replacing any door with 

an impact-resistant access door if 

necessary; inspecting application of 

stencils and index markers of impactresistant access doors and application of 

new stencils or index markers if 

necessary; and revising the maintenance 

program. 

This proposed AD requires revisions 

to certain operator maintenance 

documents to include a new CDCCL. 

Compliance with CDCCLs is required by 

section 91.403(c) of the Federal Aviation 

Regulations (14 CFR 91.403(c)). For 

airplanes that have been previously 

modified, altered, or repaired in the 

areas addressed by this proposed AD, 

the operator might not be able to 

accomplish the actions described in the 

revisions. In this situation, to comply 

with 14 CFR 91.403(c), the operator 

must request approval for an alternative 

method of compliance according to the 

procedures specified in paragraph (j) of 

this proposed AD. The request should 

include a description of changes to the 

required actions that will ensure the 

continued damage tolerance of the 

affected structure. 

This proposed AD would require 

accomplishing the actions specified in 

the service information identified 

previously. After accomplishing the 

revision required by paragraph (h) of 

this AD, no alternative actions (e.g., 

inspections), intervals, and/or CDCCLs 

may be used unless the actions, 

intervals, and/or CDCCLs are approved 

as an alternative method of compliance 

(AMOC) in accordance with the 

procedures specified in paragraph (j) of 

this AD. 

Costs of Compliance 

We estimate that this proposed AD 

affects 13 airplanes of U.S. registry. We 

estimate the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspection ........................................................ Up to 12 work-hours × $85 per hour = 

$1,020.

$0 $1,020 $13,260 

Maintenance program revision ....................... 1 work-hour × $85 per hour = $85 ................. 0 85 1,105 

We estimate the following costs to do 

any necessary replacements that would 

be required based on the results of the 

proposed inspection. We have no way of 

determining the number of aircraft that 

might need these replacements: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replacement per door ............................................................................... $3 work-hours × $85 per hour = 

$255.

$8,000 $8,255 

Stencil and index marker (16 to 18 doors per airplane) ........................... 1 work-hour per door × $85 per 

hour = $85 per door.

0 1,530 


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Federal Register / Vol. 78, No. 156 / Tuesday, August 13, 2013 / Proposed Rules 49239 

According to the manufacturer, some 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

individuals. We do not control warranty 

coverage for affected individuals. As a 

result, we have included all costs in our 

cost estimate. 

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 proposed 

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 proposed AD 

would not have federalism implications 

under Executive Order 13132. This 

proposed AD would 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 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), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) 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. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 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 airworthiness 

directive (AD): 

The Boeing Company: Docket No. FAA– 

2013–0673; Directorate Identifier 2013– 

NM–057–AD. 

(a) Comments Due Date 

We must receive comments by September 

27, 2013. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 707–100 long body, -200, -100B long 

body, and -100B short body series airplanes; 

and Model 707–300, -300B, -300C, and -400 

series airplanes; and Model 720 and 720B 

series airplanes; certificated in any category; 

as identified in Boeing Service Bulletin 707– 

3532, dated January 12, 2012. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 28, Fuel. 

(e) Unsafe Condition 

This AD was prompted by reports 

indicating that a standard access door was 

located where an impact-resistant access 

door was required, and stencils were missing 

from some impact-resistant access doors. We 

are issuing this AD to prevent foreign object 

penetration of the fuel tank, which could 

cause a fuel leak near an ignition source (e.g., 

hot brakes or engine exhaust nozzle), 

consequently leading to a fuel-fed fire. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Inspections 

Within 72 months after the effective date 

of this AD, do the actions specified in 

paragraphs (g)(1) and (g)(2) of this AD, in 

accordance with the Accomplishment 

Instructions of Boeing Service Bulletin 707– 

3532, dated January 12, 2012. 

(1) Do either a general visual inspection or 

ultrasonic non-destructive test of the left- and 

right-hand wing fuel tank access doors to 

determine whether impact-resistant access 

doors are installed in the correct locations. If 

any standard access door is found, before 

further flight, replace with an impactresistant access door, in accordance with the 

Accomplishment Instructions of Boeing 

Service Bulletin 707–3532, dated January 12, 

2012. 

(2) Do a general visual inspection of the 

left- and right-hand wing fuel tank impactresistant access doors to verify stencils and 

index markers are applied. If a stencil or 

index marker is missing, before further flight, 

apply stencil or index marker, as applicable, 

in accordance with the Accomplishment 

Instructions of Boeing Service Bulletin 707– 

3532, dated January 12, 2012. 

(h) Maintenance Program Revision 

Within 60 days after the effective date of 

this AD, revise the maintenance program to 

incorporate Critical Design Configuration 

Control Limitations (CDCCL) Task 57–AWL– 

01, Impact-Resistant Fuel Tank Access Doors, 

of Subsection B, Airworthiness Limitations 

(AWLs) of the Boeing 707/720 Airworthiness 

Limitations (AWLs) Document D6–7552– 

AWL, Revision September 2012. 

(i) No Alternative Actions, Intervals, and/or 

CDCCLs 

After accomplishing the revision required 

by paragraph (h) of this AD, no alternative 

actions (e.g., inspections), intervals, and/or 

CDCCLs may be used unless the actions, 

intervals, and/or CDCCLs are approved as an 

alternative method of compliance (AMOC) in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle Aircraft 

Certification Office (ACO), FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the ACO, send it to the 

attention of the person identified in the 

Related Information section of this AD. 

Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair 

required by this AD if it is approved by the 

Boeing Commercial Airplanes Organization 

Designation Authorization (ODA) that has 

been authorized by the Manager, Seattle ACO 

to make those findings. For a repair method 

to be approved, the repair must meet the 

certification basis of the airplane, and the 

approval must specifically refer to this AD. 

(k) Related Information 

(1) For more information about this AD, 

contact Suzanne Lucier, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue SW., Renton, WA 98057–3356; 

phone: 425–917–6438; fax: 425–917–6590; 

email: suzanne.lucier@faa.gov. 

(2) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Data & Services 


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49240 Federal Register / Vol. 78, No. 156 / Tuesday, August 13, 2013 / Proposed Rules 

Management, P. O. Box 3707, MC 2H–65, 

Seattle, WA 98124–2207; telephone 206– 

544–5000, extension 1; fax 206–766–5680; 

Internet https://www.myboeingfleet.com. You 

may review copies of the referenced service 

information at the FAA, Transport Airplane 

Directorate, 1601 Lind Avenue SW., Renton, 

WA. For information on the availability of 

this material at the FAA, call 425–227–1221. 

Issued in Renton, Washington, on August 

2, 2013. 

Ross Landes, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2013–19525 Filed 8–12–13; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0689; Directorate 

Identifier 2012–NM–225–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

Bombardier, Inc. Model DHC–8–400 

series airplanes. This proposed AD was 

prompted by a report that a batch of 

main landing gear (MLG) door actuators 

with a certain part number having 

certain serial numbers could be 

assembled with the scraper installed 

backward. This proposed AD would 

require repetitive functional checks of 

the MLG alternate extension system 

(AES) and eventual replacement of 

certain MLG door actuators with 

actuators that have either been reworked 

or do not have certain serial numbers. 

We are proposing this AD to prevent 

incorrectly installed scrapers, which 

could hinder the operation of the MLG 

AES, and result in failure of the MLG 

AES on one side, and consequent unsafe 

asymmetrical landing configuration. 

DATES: We must receive comments on 

this proposed AD by September 27, 

2013. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

• Hand Delivery: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC, between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Bombardier, 

Inc., Q-Series Technical Help Desk, 123 

Garratt Boulevard, Toronto, Ontario 

M3K 1Y5, Canada; telephone 416–375– 

4000; fax 416–375–4539; email 

thd.qseries@aero.bombardier.com; 

Internet http://www.bombardier.com. 

You may review copies of the 

referenced service information at the 

FAA, Transport Airplane Directorate, 

1601 Lind Avenue SW., Renton, WA. 

For information on the availability of 

this material at the FAA, call 425–227– 

1221. 

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 this proposed AD, the MCAI, 

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. 

FOR FURTHER INFORMATION CONTACT: 

Luke Walker, Aerospace Engineer, 

Airframe and Mechanical Systems 

Branch, ANE–171, FAA, New York 

Aircraft Certification Office (ACO), 1600 

Stewart Avenue, Suite 410, Westbury, 

New York 11590; telephone 516–228– 

7363; fax 516–794–5531. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2013–0689; Directorate Identifier 

2012–NM–225–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD based on those comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued Canadian 

Airworthiness Directive CF–2012–28R1, 

dated November 26, 2012, (referred to 

after this as the Mandatory Continuing 

Airworthiness Information, or ‘‘the 

MCAI’’), to correct an unsafe condition 

for the specified products. The MCAI 

states: 

It was discovered that a batch of [main 

landing gear] MLG door actuators, [part 

number] P/N 46830–7, may be assembled 

with the scraper installed backwards. This 

condition, if not corrected, could result in 

increased actuator friction, which could 

hinder operation of the MLG alternate 

extension system (AES). In the case of a 

failure of the primary MLG extension system, 

the failure of the MLG AES on one side will 

lead to an unsafe asymmetrical landing 

configuration. 

This [Canadian] AD mandates the 

repetitive functional check of the AES until 

replacement of the affected MLG door 

actuators. 

You may obtain further information 

by examining the MCAI in the AD 

docket. 

Relevant Service Information 

Bombardier, Inc. has issued Service 

Bulletin 84–32–108, Revision A, dated 

October 1, 2012. The actions described 

in this service information are intended 

to correct the unsafe condition 

identified in the MCAI. 

FAA’s Determination and Requirements 

of This Proposed AD 

This product has been approved by 

the aviation authority of another 

country, and is approved for operation 

in the United States. Pursuant to our 

bilateral agreement with the State of 

Design Authority, we have been notified 

of the unsafe condition described in the 

MCAI and service information 

referenced above. We are proposing this 

AD because we evaluated all pertinent 

information and determined an unsafe 

condition exists and is likely to exist or 

develop on other products of the same 

type design. 

Costs of Compliance 

We estimate that this proposed AD 

affects 2 airplanes of U.S. registry. 

We estimate the following costs to 

comply with this proposed AD: 


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