49394 Federal Register / Vol. 77, No. 159 / Thursday, August 16, 2012 / Proposed Rules 

Issued in Kansas City, Missouri, on August 

9, 2012. 

Earl Lawrence, 

Manager, Small Airplane Directorate, Aircraft 

Certification Service. 

[FR Doc. 2012–20107 Filed 8–15–12; 8:45 am] 

BILLING CODE 4910–13–C 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0806; Directorate 

Identifier 2012–NM–022–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, 

–401, and –402 airplanes. This proposed 

AD was prompted by reports of an inservice incident where the propeller deicing system became unavailable due to 

burnt/chafed wires within the 

alternating current contractor box 

(ACCB). This proposed AD would 

require inspection for chafing, damage, 

and loose wiring within an ACCB and 

repair if necessary; and would require 

rework and re-identification of the 

wiring installation within each ACCB. 

We are proposing this AD to detect and 

correct damaged, chafed, or loose wiring 

within an ACCB, which could affect the 

operation of the windshield heater, ice 

detector, angle of attack (AOA) vane 

heater, pilot probe heater, engine intake 

heater, or propeller de-icing system, and 

subsequently adversely affect the 

airplane’s flight characteristics in icing 

conditions. 

DATES: We must receive comments on 

this proposed AD by October 1, 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: 

Assata Dessaline, Aerospace Engineer, 

Avionics and Flight Test Branch, ANE– 

172, FAA, New York Aircraft 

Certification Office (ACO), 1600 Stewart 

Avenue, Suite 410, Westbury, New York 

11590; telephone (516) 228–7301; 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–2012–0806; Directorate Identifier 

2012–NM–022–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–2012–03, 

dated January 11, 2012 (referred to after 

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

condition for the specified products. 

The MCAI states: 

There has been one (1) reported in-service 

incident where the propeller de-icing system 

became unavailable due to burnt/chafed 

wires within the Alternating Current 

Contactor Box (ACCB). There has also been 

a number of additional minor events of wires 

found chafed within ACCBs. 

An investigation revealed that inadequate 

clearance between the wires and metallic 

structure within the ACCB could cause 

chafed wires. 

Damaged, chafed or loose wiring within an 

ACCB could affect the operation of the 

windshield heater, ice detector, angle of 

attack (AOA) vane heater, pitot probe heater, 

engine intake heater or propeller de-icing 

system. Loss of one of these systems could 

adversely affect the aeroplane’s flight 

characteristics in icing conditions. 

This [TCCA] Airworthiness Directive (AD) 

mandates the [visual] inspection [for 

damaged, chafed, and loose wiring within an 

ACCB and replace if necessary] and 

rectification [rework] of the wiring 

installation within each ACCB. 

You may obtain further information 

by examining the MCAI in the AD 

docket. 

Relevant Service Information 

Bombardier, Inc. has issued the 

following service bulletins: 

• Bombardier Service Bulletin 84–24– 

47, Revision A, dated September 14, 

2011. 

• Bombardier Service Bulletin 84–24– 

48, Revision A, dated September 14, 

2011. 

• Bombardier Service Bulletin 84–24– 

49, Revision A, dated September 14, 

2011. 

• Bombardier Service Bulletin 84–24– 

50, Revision A, dated September 14, 

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 


wreier-aviles on DSK7SPTVN1PROD with PROPOSALS
Federal Register / Vol. 77, No. 159 / Thursday, August 16, 2012 / Proposed Rules 49395 

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 

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 7 work-hours per product to 

comply with the basic requirements of 

this proposed AD. The average labor 

rate is $85 per work-hour. Based on 

these figures, we estimate the cost of the 

proposed AD on U.S. operators to be 

$49,385, or $595 per product. 

In addition, we estimate that any 

necessary follow-on actions would take 

about 2 work-hours and require parts 

costing $0, for a cost of $170 per 

product. We have no way of 

determining the number of products 

that may need these actions. 

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– 

0806; Directorate Identifier 2012–NM– 

022–AD. 

(a) Comments Due Date 

We must receive comments by October 1, 

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 and subsequent. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 24: Electrical Power. 

(e) Reason 

This AD was prompted by reports of an inservice incident where the propeller de-icing 

system became unavailable due to burnt/ 

chafed wires within the alternating current 

contractor box (ACCB) due to inadequate 

clearance. We are issuing this AD to detect 

and correct damaged, chafed, or loose wiring 

within an ACCB, which could affect the 

operation of the windshield heater, ice 

detector, angle of attack (AOA) vane heater, 

pilot probe heater, engine intake heater, or 

propeller de-icing system, and subsequently 

adversely affect the airplane’s flight 

characteristics in icing conditions. 

(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 

For serial numbers 4001 through 4354 and 

4356 through 4366: Within 6,000 flight hours 

or 36 months after the effective date of this 

AD, whichever occurs first: Do a general 

visual inspection for chafing, damage, and 

insulation damage, and rework the wiring 

within the ACCB, in accordance with the 

Accomplishment Instructions in the 

applicable Bombardier service bulletins 

specified in paragraphs (g)(1) through (g)(4) 

of this AD. If any chafing, damage, or 

insulation damage is found, before further 

flight, replace the damaged wiring, in 

accordance with the Accomplishment 

Instructions of the applicable Bombardier 

service bulletins specified in paragraphs 

(g)(1) through (g)(4) of this AD. 

(1) Bombardier Service Bulletin 84–24–47, 

Revision A, dated September 14, 2011. 

(2) Bombardier Service Bulletin 84–24–48, 

Revision A, dated September 14, 2011. 

(3) Bombardier Service Bulletin 84–24–49, 

Revision A, dated September 14, 2011. 

(4) Bombardier Service Bulletin 84–24–50, 

Revision A, dated September 14, 2011. 

(h) Parts Installation Prohibition 

As of the effective date of this AD, no 

person may install an ACCB having the 

combination of part numbers (P/N) and series 

specified in paragraphs (h)(1), (h)(2), (h)(3), 

and (h)(4) of this AD on any airplane. 

(1) P/N 1152130–6, series 1, 2, and 4. 

(2) P/N 1152148–6, series 1, 2, 4, and 5. 

(3) P/N 1152090–6, series 1, 2, and 4. 

(4) P/N 1152124–6, series 1, 2, 4, and 5. 

(i) Credit for Previous Actions 

This paragraph provides credit for the 

actions required by paragraph (g) of this AD, 

if those actions were performed before the 

effective date of this AD using the applicable 

service bulletins specified in paragraphs 

(i)(1) through (i)(4) of this AD. 

(1) Bombardier Service Bulletin 84–24–47, 

dated April 26, 2011. 

(2) Bombardier Service Bulletin 84–24–48, 

dated April 26, 2011. 

(3) Bombardier Service Bulletin 84–24–49, 

dated April 26, 2011. 

(4) Bombardier Service Bulletin 84–24–50, 

dated April 26, 2011. 

(j) 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 


wreier-aviles on DSK7SPTVN1PROD with PROPOSALS
49396 Federal Register / Vol. 77, No. 159 / Thursday, August 16, 2012 / Proposed Rules 

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. 

(k) Related Information 

(1) Refer to MCAI Canadian Airworthiness 

Directive CF–2012–03, dated January 11, 

2012, and the service information specified 

in paragraphs (k)(1)(i) through (k)(1)(iv) of 

this AD, for related information. 

(i) Bombardier Service Bulletin 84–24–47, 

Revision A, dated September 14, 2011. 

(ii) Bombardier Service Bulletin 84–24–48, 

Revision A, dated September 14, 2011. 

(iii) Bombardier Service Bulletin 84–24–49, 

Revision A, dated September 14, 2011. 

(iv) Bombardier Service Bulletin 84–24–50, 

Revision A, dated September 14, 2011. 

(2) For service information identified in 

this 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. 

Issued in Renton, Washington, on August 

3, 2012. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2012–20110 Filed 8–15–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0809; Directorate 

Identifier 2011–NM–135–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 supersede an 

existing airworthiness directive (AD) 

that applies to certain The Boeing 

Company Model 757 airplanes equipped 

with Rolls-Royce RB211–535E engines. 

The existing AD currently requires 

repetitive inspections for signs of 

damage of the aft hinge fittings and 

attachment bolts of the thrust reversers, 

and related investigative and corrective 

actions if necessary. The existing AD 

also provides for an optional 

terminating modification for the 

repetitive inspections. Since we issued 

the existing AD, we have received 

reports of incorrectly installed washers 

under the attachment bolts of the aft 

hinge fittings of the thrust reversers. For 

certain airplanes, this proposed AD 

would add a one-time inspection of the 

washers installed under the attachment 

bolts of the aft hinge fittings for correct 

installation sequence, and reinstallation 

if necessary. This proposed AD also 

adds an option for installing a 

redesigned aft hinge fitting with the trim 

already done, instead of trimming an 

existing or new hinge fitting, which is 

included in the existing optional 

terminating modification. We are 

proposing this AD to prevent failure of 

the attachment bolts and consequent 

separation of a thrust reverser from the 

airplane during flight, which could 

result in structural damage to the 

airplane. 

DATES: We must receive comments on 

this proposed AD by October 1, 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: 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, Washington 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, 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: 

Nancy Marsh, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, 

Washington 98057–3356; phone: 425– 

917–6440; fax: 425–917–6590; email: 

nancy.marsh@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–2012–0809; Directorate Identifier 

2011–NM–135–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 

On June 8, 2008, we issued AD 2008– 

13–20, Amendment 39–15583 (73 FR 

37786, July 2, 2008), for certain Model 

757 airplanes equipped with RollsRoyce RB211–535E engines. That AD 

requires repetitive inspections for signs 

of damage of the aft hinge fittings and 

attachment bolts of the thrust reversers, 

and related investigative and corrective 

actions if necessary. That AD also 

provides for an optional terminating 

modification for the repetitive 

inspections. That AD resulted from 

reports of several incidents of bolt 

failure at the aft hinge fittings of the 

thrust reversers due to, among other 

things, high operational loads. We 

issued that AD to prevent failure of the 

attachment bolts and consequent 

separation of a thrust reverser from the 

airplane during flight, which could 


wreier-aviles on DSK7SPTVN1PROD with PROPOSALS