This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

43176 

Vol. 77, No. 142 

Tuesday, July 24, 2012 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0722; Directorate 

Identifier 2011–NM–188–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 reports of alternating 

current (AC) generator failures inservice due to incomplete fusion in the 

weld joint of the rotor band assembly. 

This proposed AD would require 

inspecting the AC generator to 

determine the part number, and 

replacing the AC generator if necessary. 

We are proposing this AD to prevent 

rotor windings from coming in contact 

with the generator housing, which could 

result in debris contaminating and 

potentially blocking the engine oil 

scavenge system, leading to loss of oil 

pressure and an in-flight shutdown of 

the engine. 

DATES: We must receive comments on 

this proposed AD by September 7, 2012. 

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, 

Washington. 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 

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: 

Mazdak Hobbi, Aerospace Engineer, 

Propulsion and Services Branch, ANE– 

173, FAA, New York Aircraft 

Certification Office, 1600 Stewart 

Avenue, Suite 410, Westbury, NY 

11590; telephone (516) 228–7330; 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–2012–0722; Directorate Identifier 

2011–NM–188–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–2011–22, 

dated July 13, 2011 (referred to after this 

as ‘‘the MCAI’’), to correct an unsafe 

condition for the specified products. 

The MCAI states: 

There have been several reports of AC 

Generator failures in-service. The root cause 

has been attributed to an incomplete fusion 

in the weld joint of the AC Generator rotor 

band assembly. If not rectified, the rotor band 

may fail allowing the rotor windings to come 

in contact with the generator housing. The 

resulting debris could contaminate and 

potentially block the engine oil scavenge 

system, leading to loss of oil pressure and an 

in-flight shutdown of the engine. 

Bombardier has issued Service Bulletin 

(SB) 84–24–45 to inspect, [replace with 

modified or new AC generator] and reidentify the affected AC generators to a new 

part number (P/N) 1152218–6 unit in order 

to rectify the problem and ensure integrity of 

the affected units. 

The required action is replacing the 

AC generator with a modified or new 

AC generator. You may obtain further 

information by examining the MCAI in 

the AD docket. 

Relevant Service Information 

Bombardier has issued Service 

Bulletin 84–24–45, dated January 13, 

2011. 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. 


Emcdonald on DSK67QTVN1PROD with PROPOSALS
Federal Register / Vol. 77, No. 142 / Tuesday, July 24, 2012 / Proposed Rules 43177 

Differences Between This AD and the 

MCAI or Service Information 

TCCA AD CF–2011–22, dated July 13, 

2011, prohibits installation of certain 

part numbers following the 

accomplishment of the replacement 

required by paragraph (g) of this AD. 

This AD prohibits installation of those 

part numbers as of the effective date of 

this AD. 

Costs of Compliance 

Based on the service information, we 

estimate that this proposed AD would 

affect about 83 products of U.S. registry. 

We also estimate that it would take 

about 2 work-hours per product to 

comply with the basic requirements of 

this proposed AD. The average labor 

rate is $85 per work-hour. Required 

parts would cost about $0 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 the proposed AD on U.S. 

operators to be $14,110, or $170 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 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD and placed it in the 

AD docket. 

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 AD: 

Bombardier, Inc.: Docket No. FAA–2012– 

0722; Directorate Identifier 2011–NM– 

188–AD. 

(a) Comments Due Date 

We must receive comments by September 

7, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc. Model 

DHC–8–400, –401, and –402 airplanes; 

certificated in any category; serial numbers 

4001 through 4338 inclusive, with 

Honeywell alternating current (AC) generator 

part number (P/N) 1152218–3, 1152218–4 or 

1152218–5 installed. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 24: AC generator. 

(e) Reason 

This AD was prompted by reports of 

alternating current (AC) generator failures inservice due to incomplete fusion in the weld 

joint of the rotor band assembly. We are 

issuing this AD to prevent rotor windings 

from coming in contact with the generator 

housing, which could result in debris 

contaminating and potentially blocking the 

engine oil scavenge system, leading to loss of 

oil pressure and an in-flight shutdown of the 

engine. 

(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) Inspection and Replacement 

Within 6,000 flight hours or 36 months 

after the effective date of this AD, whichever 

occurs first: Inspect the left and right AC 

generators to determine if the AC generator 

has a part number identified in step 3.B.(2) 

of the Accomplishment Instructions of 

Bombardier Service Bulletin 84–24–45, dated 

January 13, 2011, or has P/N 1152218–3. If 

an AC generator has a part number identified 

in Bombardier Service Bulletin 84–24–45, 

dated January 13, 2011, or has P/N 1152218– 

3, before further flight, replace the AC 

generator with a modified or new AC 

generator having P/N 1152218–6, in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

84–24–45, dated January 13, 2011. 

(h) Parts Installation Prohibition 

After-the effective date of this AD, no 

person may install an AC generator with a P/ 

N 1152218–5, 1152218–4, or 1152218–3 on 

any airplane. 

(i) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York Aircraft 

Certification Office (ACO), ANE–170, 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 ACO, send it to ATTN: 

Program Manager, Continuing Operational 

Safety, FAA, New York ACO, 1600 Stewart 

Avenue, Suite 410, Westbury, New York 

11590; telephone 516–228–7300; fax 516– 

794–5531. 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. 

(j) Related Information 

(1) Refer to MCAI Canadian Airworthiness 

Directive CF–2011–22, dated July 13, 2011; 

and Bombardier Service Bulletin 84–24–45, 

dated January 13, 2011; for related 

information. 

(2) For service information identified in 

this AD, contact Bombardier, Inc., Q-Series 


Emcdonald on DSK67QTVN1PROD with PROPOSALS
43178 Federal Register / Vol. 77, No. 142 / Tuesday, July 24, 2012 / Proposed Rules 

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, 

Washington. For information on the 

availability of this material at the FAA, call 

425–227–1221. 

Issued in Renton, Washington, on July 13, 

2012. 

Michael Kaszycki, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–17967 Filed 7–23–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–0652; Directorate 

Identifier 2010–NM–045–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental Notice of 

Proposed Rulemaking (NPRM); 

reopening of comment period. 

SUMMARY: We are revising an earlier 

proposed airworthiness directive (AD) 

for all The Boeing Company Model MD– 

90–30 airplanes. That NPRM proposed 

to require repetitive eddy current high 

frequency (ETHF) inspections for 

cracking on the aft side of the left and 

right wing rear spar lower caps at 

station Xrs = 164.000, further ETHF 

inspections if cracks are found, and 

repair if necessary. The NPRM also 

proposed repetitive post-repair 

inspections, and repair if necessary. 

That NPRM was prompted by reports of 

cracks of the wing rear spar lower cap 

at the outboard flap, inboard drive hinge 

at station Xrs=164.000. This action 

revises that NPRM by adding repetitive 

post-repair inspections, and corrective 

action if necessary. We are proposing 

this supplemental NPRM to detect and 

correct cracking of the left and right rear 

spar lower caps, which could result in 

fuel leaks and damage to the wing skin 

or other structure, and consequent loss 

of the structural integrity of the wing. 

Since these actions impose an 

additional burden over that proposed in 

the NPRM, we are reopening the 

comment period to allow the public the 

chance to comment on these proposed 

changes. 

DATES: We must receive comments on 

this supplemental NPRM by September 

7, 2012. 

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: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590, between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. 

For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Data & Services 

Management, 3855 Lakewood 

Boulevard, MC D800–0019, Long Beach, 

California 90846–0001; telephone 206– 

544–5000, extension 2; fax 206–766– 

5683; 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, Washington. 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: 

Roger Durbin, Airframe Branch, ANM– 

120L, FAA, Los Angeles Aircraft 

Certification Office (ACO), 3960 

Paramount Boulevard, Lakewood, 

California 90712–4137; phone (562) 

627–5233; fax (562) 627–5210; email: 

roger.durbin@faa.gov. 

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–2011–0652; Directorate Identifier 

2010–NM–045–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 issued an NPRM to amend 14 CFR 

part 39 to include an AD that would 

apply to all The Boeing Company Model 

MD–90–30 airplanes. That NPRM 

published in the Federal Register on 

July 8, 2011 (76 FR 40288). That NPRM 

proposed to require repetitive eddy 

current high frequency (ETHF) 

inspections for cracking on the aft side 

of the left and right wing rear spar lower 

caps at station Xrs=164.000, further 

ETHF inspections if cracks are found, 

and repair if necessary. The NPRM also 

proposed repetitive post-repair 

inspections, and repair if necessary. 

Actions Since Previous NPRM (76 FR 

40288, July 8, 2011) Was Issued 

Since we issued the previous NPRM 

(76 FR 40288, July 8, 2011), we have 

determined that it is necessary to add 

repetitive inspections for cracking on 

the wing rear spar lower caps at station 

Xrs=164.000 after the splice repair is 

done. The replacement spar cap is 

susceptible to fatigue cracking because 

its design is the same as that of the 

original spar cap. 

Comments 

We gave the public the opportunity to 

comment on the previous NPRM (76 FR 

40288, July 8, 2011). The following 

presents the comments received on the 

NPRM and the FAA’s response to each 

comment. 

Request for Inspection 

Boeing requested that we revise the 

original NPRM (76 FR 40288, July 8, 

2011) to require an ETHF inspection on 

any splice repair within 30,000 flight 

cycles after the repair. Boeing explained 

that neither Boeing Alert Service 

Bulletin MD90–57A026, Revision 1, 

dated February 23, 2011 (which was 

cited as the appropriate source of 

service information for the original 


Emcdonald on DSK67QTVN1PROD with PROPOSALS