Federal Register / Vol. 79, No. 82 / Tuesday, April 29, 2014 / Rules and Regulations 23903 

(6) You may view this 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/cfr/ibrlocations.html. 

Issued in Renton, Washington, on April 7, 

2014. 

John P. Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2014–09623 Filed 4–28–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0690; Directorate 

Identifier 2013–NM–088–AD; Amendment 

39–17835; AD 2014–08–11] 

RIN 2120–AA64 

Airworthiness Directives; the Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are superseding 

Airworthiness Directive (AD) 2009–24– 

07 for certain the Boeing Company 

Model 737–600, –700, –700C, and –800 

series airplanes. AD 2009–24–07 

required repetitive lubrications of the 

right and left main landing gear (MLG) 

forward trunnion pins. AD 2009–24–07 

also required an inspection for 

discrepancies of the transition radius of 

the MLG forward trunnion pins, and 

corrective actions if necessary. For 

certain airplanes, AD 2009–24–07 

required repetitive detailed inspections 

for discrepancies (including finish 

damage, corrosion, pitting, and base 

metal scratches) of the transition radius 

of the left and right MLG trunnion pins, 

and corrective action if necessary. 

Replacing or overhauling the trunnion 

pins terminates the actions required by 

AD 2009–24–07. This new AD adds 

airplanes to the applicability of AD 

2009–24–07. This AD was prompted by 

reports of corrosion protection damage 

to the forward trunnion pin on 

additional airplanes. We are issuing this 

AD to prevent stress corrosion cracking 

of the forward trunnion pins, which 

could result in fracture of the pins and 

consequent collapse of the MLG. 

DATES: This AD is effective June 3, 2014. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of June 3, 2014. 

ADDRESSES: For service information 

identified in this 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 view 

this 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 by searching for 

and locating Docket No. FAA–2013– 

0690; 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 AD, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

Docket Office (phone: 800–647–5527) is 

Docket Management Facility, U.S. 

Department of Transportation, Docket 

Operations, M–30, West Building 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE., Washington, 

DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Nancy Marsh, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, WA 

98057–3356; phone: 425–917–6440; fax: 

425–917–6590; email: nancy.marsh@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2009–24–07, 

Amendment 39–16095 (74 FR 62231, 

November 27, 2009). AD 2009–24–07 

applied to certain The Boeing Company 

Model 737–600, –700, –700C, and –800 

series airplanes. The NPRM published 

in the Federal Register on August 13, 

2013 (78 FR 49229). The NPRM was 

prompted by reports of corrosion 

protection damage to the forward 

trunnion pin on additional airplanes. 

The NPRM proposed to continue to 

require repetitive lubrications of the 

right and left main landing gear (MLG) 

forward trunnion pins. The NPRM also 

proposed to continue to require an 

inspection for discrepancies of the 

transition radius of the MLG forward 

trunnion pins, and corrective actions if 

necessary. For certain airplanes, the 

NPRM proposed to continue to require 

repetitive detailed inspections for 

discrepancies (including finish damage, 

corrosion, pitting, and base metal 

scratches) of the transition radius of the 

left and right MLG trunnion pins, and 

corrective action if necessary. Replacing 

or overhauling the trunnion pins would 

terminate the actions required by AD 

2009–24–07. The NPRM proposed to 

add airplanes to the applicability of AD 

2009–24–07. We are issuing this AD to 

prevent stress corrosion cracking of the 

forward trunnion pins, which could 

result in fracture of the pins and 

consequent collapse of the MLG. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. The 

following presents the comments 

received on the proposal (78 FR 49229, 

August 13, 2013) and the FAA’s 

response to each comment. 

Concurrence With the NPRM (78 FR 

49229, August 13, 2013) 

Boeing stated that it concurs with the 

content of the NPRM (78 FR 49229, 

August 13, 2013). 

Supplemental Type Certificate (STC) 

Winglet Comment 

Aviation Partners Boeing stated that 

the installation of winglets per STC 

ST00830SE (http://rgl.faa.gov/

Regulatory_and_Guidance_Library/

rgstc.nsf/0/408E012E008616A786257

8880060456C?Open

Document&Highlight=st00830se) does 

not affect the accomplishment of the 

manufacturer’s service instructions. 

We have redesignated paragraph (c) of 

the NPRM (78 FR 49229, August 13, 

2013) as paragraph (c)(1) of this AD, and 

added paragraph (c)(2) to this AD to 

state that installation of STC ST00830SE 

(http://rgl.faa.gov/Regulatory_and_

Guidance_Library/rgstc.nsf/0/

408E012E008616A7862578880060456C?

OpenDocument&Highlight=st00830se) 

does not affect the ability to accomplish 

the actions required by this AD. 

Therefore, for airplanes on which STC 

ST00830SE is installed, a ‘‘change in 

product’’ alternative method of 

compliance (AMOC) approval request is 

not necessary to comply with the 

requirements of 14 CFR 39.17. For all 

other AMOC requests, the operator must 

request approval of an AMOC in 

accordance with the procedures 

specified in paragraph (l) of this AD. 

Request for Clarification of Location of 

Trunnion Pins 

Delta asked for clarification of the 

term ‘‘trunnion pins’’ as specified in the 


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23904 Federal Register / Vol. 79, No. 82 / Tuesday, April 29, 2014 / Rules and Regulations 

NPRM (78 FR 49229, August 13, 2013). 

Delta stated that throughout the 

preamble of the NPRM, the subject pins 

are referred to as ‘‘forward trunnion 

pins;’’ however, in paragraphs (h) and 

(i) of the NPRM, the location is omitted 

and the term ‘‘trunnion pins’’ is used. 

Delta noted that since forward and aft 

trunnion pins are installed, failing to 

identify the affected pin as a ‘‘forward 

trunnion pin’’ adds a potential for 

errors. 

We agree that the term ‘‘trunnion 

pins’’ should be clarified to include the 

pin location. We have changed 

paragraphs (h) and (i) of this final rule 

to specify ‘‘forward trunnion pins.’’ 

Request To Use Alternate Grease for 

Lubrication of the Forward Trunnion 

Pins 

Delta asked that paragraph (g) of the 

NPRM (78 FR 49229, August 13, 2013) 

be changed to allow the use of Royco11MS grease as an alternate to the BMS 

3-33 grease specified in Boeing Special 

Attention Service Bulletin 737–32– 

1402, Revision 1, dated February 7, 

2013. Delta stated that Royco-11MS is 

the standard grease used on Delta 

aircraft landing gear applications, and it 

would like to continue using this grease 

when lubricating the forward trunnion 

pins. 

We do not agree to allow the use of 

an alternative type of grease. Approval 

of an operator’s unique maintenance 

actions is dependent on its ability to 

provide acceptable data supporting the 

request. We would not provide such an 

approval to all operators via a change to 

the NPRM (78 FR 49229, August 13, 

2013). However, we would consider this 

request for approval of unique 

maintenance practices in accordance 

with the procedures identified in 

paragraph (l) of this AD. We have made 

no change to this final rule in this 

regard. 

Request To Further Clarify Certain 

Language 

Ryanair (RYR) asked that clarification 

be provided to reflect new information 

it received from Boeing. RYR stated that 

the intent of paragraphs (g) and (h) of 

the NPRM (78 FR 49229, August 13, 

2013) appears to be to require that the 

30-day repetitive lubrication task 

continue until all repetitive inspections 

are completed, as stated in Notes (a) and 

(b) of paragraph 1.E., ‘‘Compliance,’’ of 

Boeing Special Attention Service 

Bulletin 737–32–1402, Revision 1, dated 

February 7, 2013. RYR received 

correspondence from Boeing stating that 

the 30-day lubrication task is terminated 

after accomplishing the first in-situ 

detailed inspection. RYR recommends 

the information from Boeing be 

included in the NPRM. 

RYR has correctly interpreted the 

requirements in paragraphs (g) and (h) 

of this AD. However, we find that 

further clarification is necessary. If 

certain discrepancies are found during 

the detailed inspection of the forward 

trunnion pins, replacing the affected 

trunnion pins terminates the repetitive 

requirements in this AD. If no 

discrepancies are found during the 

detailed inspection of the forward 

trunnion pins, an additional lubrication 

of the left and right MLG forward 

trunnion is required, which terminates 

the repetitive requirements in this AD. 

If certain other discrepancies are found 

during the detailed inspection of the 

forward trunnion pins, the lubrications 

and detailed inspections must be 

repeated until overhaul or replacement 

of the affected trunnion pins. 

Additionally, Boeing did not provide 

any new information or data to the FAA, 

nor are we aware of any intention to 

revise its service information. However, 

under the provisions of paragraph (l) of 

this AD, we may consider requests for 

approval of an alternative method of 

compliance (AMOC) if sufficient data 

are submitted to substantiate that 

terminating the repetitive lubrications 

after doing the first detailed inspection 

would provide an acceptable level of 

safety. In light of these factors, we have 

made no change to this final rule. 

Conclusion 

We reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting this AD 

with the changes described previously. 

We also determined that these changes 

will not increase the economic burden 

on any operator or increase the scope of 

this AD. 

Costs of Compliance 

We estimate that this AD affects 431 

airplanes of U.S. registry. 

ESTIMATED COSTS

Action Work hours Average labor 

rate per hour Parts Cost per product 

Number of 

U.S.-registered 

airplanes 

Fleet cost 

Repetitive lubrications .. 1 $85 $0 $85 per lubrication ...... 431 $36,635 per lubrication. 

Repetitive inspections .. 8 85 0 $680 per inspection 

cycle.

431 $293,080 per inspection cycle. 

We have received no definitive data 

that would enable us to provide cost 

estimates for the on-condition actions 

specified in this AD. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

Section 106, describes the authority of 

the FAA Administrator. Subtitle VII, 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

We are issuing this rulemaking under 

the authority described in Subtitle VII, 

Part A, Subpart III, Section 44701, 

‘‘General requirements.’’ Under that 

section, Congress charges the FAA with 

promoting safe flight of civil aircraft in 

air commerce by prescribing regulations 

for practices, methods, and procedures 

the Administrator finds necessary for 

safety in air commerce. This regulation 

is within the scope of that authority 

because it addresses an unsafe condition 

that is likely to exist or develop on 

products identified in this rulemaking 

action. 

Regulatory Findings 

We have determined that this AD will 

not have federalism implications under 

Executive Order 13132. This AD will 

not have a substantial direct effect on 

the States, on the relationship between 

the national government and the States, 

or on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) Will not have a significant 

economic impact, positive or negative, 


sroberts on DSK5SPTVN1PROD with RULES
Federal Register / Vol. 79, No. 82 / Tuesday, April 29, 2014 / Rules and Regulations 23905 

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. 

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 

removing Airworthiness Directive (AD) 

2009–24–07, Amendment 39–16095 (74 

FR 62231, November 27, 2009), and 

adding the following new AD: 

2014–08–11 Boeing: Amendment 39–17835; 

Docket No. FAA–2013–0690; Directorate 

Identifier 2013–NM–088–AD. 

(a) Effective Date 

This AD is effective June 3, 2014. 

(b) Affected ADs 

This AD supersedes AD 2009–24–07, 

Amendment 39–16095 (74 FR 62231, 

November 27, 2009). 

(c) Applicability 

(1) This AD applies to The Boeing 

Company Model 737–600, –700, –700C, –800 

and –900 series airplanes, certificated in any 

category; as identified in Boeing Special 

Attention Service Bulletin 737–32–1402, 

Revision 1, dated February 7, 2013. 

(2) Installation of Supplemental Type 

Certificate (STC) ST00830SE (http://

rgl.faa.gov/Regulatory_and_Guidance_

Library/rgstc.nsf/0/408E012E008616A78625

78880060456C?OpenDocument&Highlight

=st00830se) does not affect the ability to 

accomplish the actions required by this AD. 

Therefore, for airplanes on which STC 

ST00830SE is installed, a ‘‘change in 

product’’ alternative method of compliance 

(AMOC) approval request is not necessary to 

comply with the requirements of 14 CFR 

39.17. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 32, Landing gear. 

(e) Unsafe Condition 

This AD was prompted by a report that the 

protective finishes on the forward trunnion 

pins for the left and right MLG might have 

been damaged during final assembly. We are 

issuing this AD to prevent stress corrosion 

cracking of the forward trunnion pins, which 

could result in fracture of the pins and 

consequent collapse of the MLG. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Repetitive Lubrications 

At the applicable compliance time 

specified in paragraph 1.E., ‘‘Compliance,’’ of 

Boeing Special Attention Service Bulletin 

737–32–1402, Revision 1, dated February 7, 

2013, except as required by paragraph (j) of 

this AD: Lubricate the left and right MLG 

forward trunnion pins, in accordance with 

the Accomplishment Instructions of Boeing 

Special Attention Service Bulletin 737–32– 

1402, Revision 1, dated February 7, 2013. 

Repeat the lubrication thereafter at the 

applicable time specified in paragraph 1.E., 

‘‘Compliance,’’ until all applicable 

requirements of paragraph (h) of this AD 

have been accomplished. 

(h) Inspection 

At the applicable compliance time 

specified in paragraph 1.E., ‘‘Compliance,’’ of 

Boeing Special Attention Service Bulletin 

737–32–1402, Revision 1, dated February 7, 

2013, except as required by paragraph (j) of 

this AD: Except as provided by paragraph (i) 

of this AD, do a detailed inspection for 

discrepancies (including finish damage, 

corrosion, pitting, and base metal scratches) 

of the transition radius of the left and right 

MLG forward trunnion pins, and do all 

applicable repetitive inspections and related 

investigative and corrective actions, in 

accordance with the Accomplishment 

Instructions of Boeing Special Attention 

Service Bulletin 737–32–1402, Revision 1, 

dated February 7, 2013. Accomplishing the 

detailed inspections (initial and repetitive) 

and all applicable corrective actions 

specified in this paragraph terminates the 

repetitive lubrication requirements of 

paragraph (g) of this AD. 

(i) Optional Terminating Action 

Overhauling or replacing a forward 

trunnion pin, in accordance with the 

Accomplishment Instructions of Boeing 

Special Attention Service Bulletin 737–32– 

1402, Revision 1, dated February 7, 2013, 

ends the repetitive lubrication requirements 

of paragraph (g) of this AD, and the actions 

required by paragraph (h) of this AD, for that 

forward trunnion pin only. 

(j) Exception to Service Information 

Specifications 

Where Boeing Special Attention Service 

Bulletin 737–32–1402, Revision 1, dated 

February 7, 2013, specifies a compliance time 

‘‘from the date of Revision 1 of this service 

bulletin,’’ this AD requires compliance 

within the specified compliance time after 

the effective date of this AD. 

(k) Credit for Previous Actions 

This paragraph provides credit for the 

actions required by this AD, if those actions 

were performed before the effective date of 

this AD using Boeing Special Attention 

Service Bulletin 737–32–1402, dated August 

6, 2008, which was incorporated by reference 

in AD 2009–24–07, Amendment 39–16095 

(74 FR 62231, November 27, 2009). 

(l) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle 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 

paragraph (m)(1) of this AD. Information may 

be emailed to: 9-ANM-Seattle-ACO-AMOCRequests@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 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. 

(4) AMOCs approved previously for AD 

2009–24–07, Amendment 39–16095 (74 FR 

62231, November 27, 2009), are approved as 

AMOCs for the corresponding provisions of 

paragraphs (g) and (h) of this AD. 

(m) Related Information 

(1) For more information about this AD, 

contact Nancy Marsh, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue SW., Renton, WA 98057–3356; 

phone: 425–917–6440; fax: 425–917–6590; 

email: nancy.marsh@faa.gov. 

(2) Service information identified in this 

AD that is not incorporated by reference in 

this AD may be obtained at the addresses 

specified in paragraphs (n)(3) and (n)(4) of 

this AD. 

(n) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Boeing Special Attention Service 

Bulletin 737–32–1402, Revision 1, dated 

February 7, 2013. 

(ii) Reserved. 

(3) For service information identified in 

this 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. 

(4) You may view this 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. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 


sroberts on DSK5SPTVN1PROD with RULES
23906 Federal Register / Vol. 79, No. 82 / Tuesday, April 29, 2014 / Rules and Regulations 

Administration (NARA). For information on 

the availability of this material at NARA, call 

202–741–6030, or go to: http://

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued in Renton, Washington, on April 14, 

2014. 

Jeffrey E. Duven, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2014–09309 Filed 4–28–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0837; Directorate 

Identifier 2013–NM–112–AD; Amendment 

39–17832; AD 2014–08–08] 

RIN 2120–AA64 

Airworthiness Directives; the Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 737–200, 

–200C, –300, –400, and –500 series 

airplanes. This AD was prompted by 

reports of cracking found in the skin at 

the lower aft corner of the forward entry 

doorway on airplanes that do not have 

an airstair door cutout. This AD requires 

repetitive inspections for cracking in the 

lower corners of the forward entry 

doorway on airplanes that do not have 

an airstair door cutout, and repair if 

necessary. We are issuing this AD to 

detect and correct cracking in the lower 

corners of the forward entry doorway, 

which could lead to crack progression 

and consequent rapid decompression of 

the airplane. 

DATES: This AD is effective June 3, 2014 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of June 3, 2014. 

ADDRESSES: For service information 

identified in this 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 view 

this 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 by searching for 

and locating Docket No. FAA–2013– 

0837; 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 AD, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

Docket Office (phone: 800–647–5527) is 

Docket Management Facility, U.S. 

Department of Transportation, Docket 

Operations, M–30, West Building 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE., Washington, 

DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Alan Pohl, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, WA 

98057–3356; phone: 425–917–6450; fax: 

425–917–6590; email: alan.pohl@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain The Boeing Company 

Model 737–200, –200C, –300, –400, and 

–500 series airplanes. The NPRM 

published in the Federal Register on 

October 2, 2013 (78 FR 60807). The 

NPRM was prompted by reports of 

cracking found in the skin at the lower 

aft corner of the forward entry doorway 

on airplanes that do not have an airstair 

door cutout. The NPRM proposed to 

require repetitive inspections for 

cracking in the lower corners of the 

forward entry doorway on airplanes that 

do not have an airstair door cutout, and 

repair if necessary. We are issuing this 

AD to detect and correct cracking in the 

lower corners of the forward entry 

doorway, which could lead to crack 

progression and consequent rapid 

decompression of the airplane. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. The 

following presents the comments 

received on the proposal (78 FR 60807, 

October 2, 2013) and the FAA’s 

response to each comment. 

Support for the Proposed Requirements 

Boeing stated that it concurs with the 

proposed requirements. 

Statement Regarding Effect of Winglets 

on Accomplishment of AD 

Requirements 

Aviation Partners Boeing stated that 

the installation of winglets per APB 

Supplemental Type Certificate (STC) 

ST01219SE (http://rgl.faa.gov/

Regulatory_and_Guidance_Library/

rgstc.nsf/0/

be866b732f6cf31086257b9700692796/

$FILE/ST01219SE.pdf) does not affect 

the accomplishment of the 

manufacturer’s service instructions. 

We agree. We have redesignated 

paragraph (c) of the NPRM (78 FR 

60807, October 2, 2013) as paragraph 

(c)(1) and added paragraph (c)(2) to this 

final rule to state that installation of 

APB STC ST01219SE (http://rgl.faa.gov/ 

Regulatory_and_Guidance_Library/

rgstc.nsf/0/

be866b732f6cf31086257b9700692796/

$FILE/ST01219SE.pdf) does not affect 

the ability to accomplish the actions 

required by this AD. Therefore, for 

airplanes on which APB STC 

ST01219SE is installed, a ‘‘change in 

product’’ alternative method of 

compliance (AMOC) approval request is 

not necessary to comply with the 

requirements of section 39.17 of the 

Federal Aviation Regulations (14 CFR 

39.17). 

Request To Allow Credit for Previously 

Accomplished Repairs 

Alaska Airlines (ASA) requested that 

we revise the NPRM (78 FR 60807, 

October 2, 2013) to allow credit for 

previously accomplished repairs. ASA 

stated that it has already installed 

repairs in the specified area using FAAand Boeing-approved data on some of 

its airplanes. ASA did not provide 

details for any specific repair. 

We do not agree to allow credit for 

unspecified repairs. ASA did not 

provide criteria for evaluating existing 

repairs or for demonstrating how such 

repairs would comply with the 

requirements of this AD. However, once 

we issue this AD, any person may 

request approval of an existing repair as 

an AMOC under the provisions of 

paragraph (j) of this AD. We have not 

changed this final rule in this regard. 

Request To Allow Certain Terminating 

Repairs for Certain Airplanes 

Southwest Airlines (SWA) requested 

that certain structural repairs specified 

in Part 2 of the Work Instructions of 

Boeing Alert Service Bulletin 737– 

53A1329, dated June 4, 2013, terminate 

both the initial and repetitive 

inspections required by paragraph (g) of 

the NPRM (78 FR 60807, October 2, 

2013). SWA pointed out that Boeing 


sroberts on DSK5SPTVN1PROD with RULES