31504 Federal Register / Vol. 83, No. 130 / Friday, July 6, 2018 / Proposed Rules 

(k) 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 Airbus All 

Operators Telex (AOT) A53L012–16, dated 

May 30, 2016, or Revision 1, dated March 9, 

2017. 

(l) Other FAA AD Provisions 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Section, Transport Standards Branch, 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 International 

Section, send it to the attention of the person 

identified in paragraph (m)(2) of this AD. 

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. 

(2) Contacting the Manufacturer: As of the 

effective date of this AD, for any requirement 

in this AD to obtain corrective actions from 

a manufacturer, the action must be 

accomplished using a method approved by 

the Manager, International Section, Transport 

Standards Branch, FAA; or the EASA; or 

EASA DOA. If approved by the DOA, the 

approval must include the DOA-authorized 

signature. 

(m) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) EASA AD 

2018–0005, dated January 10, 2018, for 

related information. This MCAI may be 

found in the AD docket on the internet at 

http://www.regulations.gov by searching for 

and locating Docket No. FAA–2018–0583. 

(2) For more information about this AD, 

contact Vladimir Ulyanov, Aerospace 

Engineer, International Section, Transport 

Standards Branch, FAA, 2200 South 216th 

St., Des Moines, WA 98198; telephone and 

fax 206–231–3229. 

(3) For service information identified in 

this AD, contact Airbus SAS, Airworthiness 

Office—EAL, 2 Rond-Point Emile Dewoitine, 

31700 Blagnac Cedex, France; telephone +33 

5 61 93 36 96; fax +33 5 61 93 45 80; email 

airworthiness.A330-A340@airbus.com; 

internet http://www.airbus.com. You may 

view this service information at the FAA, 

Transport Standards Branch, 2200 South 

216th St., Des Moines, WA. For information 

on the availability of this material at the 

FAA, call 206–231–3195. 

Issued in Des Moines, Washington, on June 

22, 2018. 

Michael Kaszycki, 

Acting Director, System Oversight Division, 

Aircraft Certification Service. 

[FR Doc. 2018–14407 Filed 7–5–18; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2018–0551; Product 

Identifier 2018–NM–023–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. 

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 CL–600–2C10 

(Regional Jet Series 700, 701, & 702) 

airplanes; Model CL–600–2D15 

(Regional Jet Series 705) airplanes; 

Model CL–600–2D24 (Regional Jet 

Series 900) airplanes; and Model CL– 

600–2E25 (Regional Jet Series 1000) 

airplanes. This proposed AD was 

prompted by reports of damage to the 

protective coating and corrosion on the 

piston/axle of the main landing gear 

(MLG), caused by friction between the 

inboard axle sleeve and the axle thrust 

face. This proposed AD would require 

revising the maintenance or inspection 

program, as applicable, to incorporate a 

detailed inspection of the MLG piston/ 

axle for damage to the protective coating 

and for corrosion. We are proposing this 

AD to address the unsafe condition on 

these products. 

DATES: We must receive comments on 

this proposed AD by August 20, 2018. 

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 NPRM, contact Bombardier, Inc., 

400 Coˆte-Vertu Road West, Dorval, 

Que ́bec H4S 1Y9, Canada; Widebody 

Customer Response Center North 

America toll-free telephone 1–866–538– 

1247 or direct-dial telephone 1–514– 

855–2999; fax 514–855–7401; email 

ac.yul@aero.bombardier.com; internet 

http://www.bombardier.com. You may 

view this service information at the 

FAA, Transport Standards Branch, 2200 

South 216th St., Des Moines, WA. For 

information on the availability of this 

material at the FAA, call 206–231–3195. 

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–2018– 

0551; 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 NPRM, the regulatory 

evaluation, any comments received, and 

other information. The street address for 

the Docket Operations office (telephone 

800–647–5527) is in the ADDRESSES

section. Comments will be available in 

the AD docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Darren Gassetto, Aerospace Engineer, 

Airframe and Mechanical Systems 

Section, FAA, New York ACO Branch, 

1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516– 

228–7323; fax 516–794–5531; email 9- 

avs-nyaco-cos@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– 

2018–0551; Product Identifier 2018– 

NM–023–AD’’ at the beginning of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this NPRM. We will consider 

all comments received by the closing 

date and may amend this NPRM 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 NPRM. 

Discussion 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued Canadian AD 

CF–2017–38, dated December 20, 2017 

(referred to after this as the Mandatory 

Continuing Airworthiness Information, 

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

condition for certain Bombardier, Inc., 

Model CL–600–2C10 (Regional Jet 

Series 700, 701, & 702) airplanes; Model 

CL–600–2D15 (Regional Jet Series 705) 

airplanes; Model CL–600–2D24 


daltland on DSKBBV9HB2PROD with PROPOSALS
Federal Register / Vol. 83, No. 130 / Friday, July 6, 2018 / Proposed Rules 31505 

(Regional Jet Series 900) airplanes; and 

Model CL–600–2E25 (Regional Jet Series 

1000) airplanes. The MCAI states: 

There have been reports of damage to the 

protective coating and/or corrosion on the 

piston/axle of the Main Landing Gear (MLG). 

The damage to the protective coating was 

caused by friction between the inboard axle 

sleeve and the axle thrust face. If not 

corrected, this condition can cause the axle 

to separate from the piston/axle [and 

consequent collapse of the landing gear 

during ground maneuvers or upon landing]. 

This [Canadian] AD mandates the 

incorporation of a new maintenance task in 

order to perform a [detailed] visual 

inspection of the piston/axle of the MLG to 

prevent the axle separation from the piston/ 

axle. 

You may examine the MCAI in the 

AD docket on the internet at http://

www.regulations.gov by searching for 

and locating Docket No. FAA–2018– 

0551. 

Related Service Information Under 1 

CFR Part 51 

Bombardier, Inc. has issued CRJ 

Series Regional Jet Temporary Revision 

(TR) MRB–0059, dated March 20, 2015, 

to Bombardier CRJ Series Regional Jet 

Maintenance Requirements Manual 

(MRM), Part 1, CSP B–053. The service 

information describes an airworthiness 

limitation task for a detailed inspection 

for damage to the protective coating and 

for corrosion on the piston/axle of the 

MLG. This service information is 

reasonably available because the 

interested parties have access to it 

through their normal course of business 

or by the means identified in the 

ADDRESSES section. 

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. 

This AD requires revisions to certain 

operator maintenance documents to 

include new actions (e.g., inspections). 

Compliance with these actions is 

required by 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 may 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 

paragraph (j)(1) of this proposed AD. 

The request should include a 

description of changes to the required 

inspections that will ensure the 

continued operational safety of the 

airplane. 

Costs of Compliance 

We estimate that this proposed AD 

affects 530 airplanes of U.S. registry. We 

estimate the following costs to comply 

with this proposed AD: 

We have determined that revising the 

maintenance or inspection program 

takes an average of 90 work-hours per 

operator, although we recognize that 

this number may vary from operator to 

operator. In the past, we have estimated 

that this action takes 1 work-hour per 

airplane. Since operators incorporate 

maintenance or inspection program 

changes for their affected fleet(s), we 

have determined that a per-operator 

estimate is more accurate than a perairplane estimate. Therefore, we 

estimate the total cost per operator to be 

$7,650 (90 work-hours × $85 per workhour). 

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. 

This proposed AD is issued in 

accordance with authority delegated by 

the Executive Director, Aircraft 

Certification Service, as authorized by 

FAA Order 8000.51C. In accordance 

with that order, issuance of ADs is 

normally a function of the Compliance 

and Airworthiness Division, but during 

this transition period, the Executive 

Director has delegated the authority to 

issue ADs applicable to transport 

category airplanes to the Director of the 

System Oversight Division. 

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): 

Bombardier, Inc: Docket No. FAA–2018– 

0551; Product Identifier 2018–NM–023– 

AD. 

(a) Comments Due Date 

We must receive comments by August 20, 

2018. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to certain Bombardier, 

Inc., Model CL–600–2C10 (Regional Jet Series 

700, 701, & 702) airplanes, serial numbers 

10002 and subsequent; Model CL–600–2D15 

(Regional Jet Series 705) airplanes and Model 

CL–600–2D24 (Regional Jet Series 900) 

airplanes, serial numbers 15001 and 

subsequent; and Model CL–600–2E25 


daltland on DSKBBV9HB2PROD with PROPOSALS
31506 Federal Register / Vol. 83, No. 130 / Friday, July 6, 2018 / Proposed Rules 

(Regional Jet Series 1000) airplanes, serial 

numbers 19001 and subsequent, certificated 

in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 32, Landing gear. 

(e) Reason 

This AD was prompted by reports of 

damage to the protective coating and 

corrosion found on the piston/axle of the 

main landing gear (MLG), caused by friction 

between the inboard axle sleeve and the axle 

thrust face. We are issuing this AD to address 

such damage, which could cause the axle to 

separate from the piston/axle, and ultimately 

lead to collapse of the landing gear during 

ground maneuvers or upon landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance or Inspection Program 

Revision 

Within 30 days after the effective date of 

this AD: Revise the maintenance or 

inspection program, as applicable, by 

incorporating CRJ Series Regional Jet 

Temporary Revision (TR) MRB–0059, dated 

March 20, 2015, to Bombardier CRJ Series 

Regional Jet Maintenance Requirements 

Manual (MRM), Part 1, CSP B–053. The 

applicable maintenance or inspection 

program revision required by this paragraph 

may be done by inserting a copy of TR MRB– 

0059, dated March 20, 2015, to Bombardier 

CRJ Series Regional Jet MRM, Part 1, CSP B– 

053. When the information in TR MRB–0059, 

dated March 20, 2015, to Bombardier CRJ 

Series Regional Jet MRM, Part 1, CSP B–053, 

has been included in the general revisions of 

Bombardier CRJ Series Regional Jet MRM, 

Part 1, CSP B–053, the general revisions may 

be inserted in the MRM, and this TR may be 

removed, provided the relevant information 

in the general revision is identical to that in 

Bombardier TR MRB–0059, dated March 20, 

2015, to Bombardier CRJ Series Regional Jet 

MRM, Part 1, CSP B–053. The initial time for 

the task is at the applicable time specified in 

figure 1 to paragraphs (g) and (h) of this AD. 

Information used for determining the entry 

into service date can be found in paragraph 

(h) of this AD. 

(h) Information for Calculating Time Since 

Piston/Axle Entry Into Service Date 

The entry into service date (first column of 

figure 1 to paragraphs (g) and (h) of this AD) 

can be calculated from the date of the latest 

inspection, restoration, or repair 

accomplished as specified in the service 

information listed in (h)(1) through (h)(3) 

inclusive, as applicable. 

(1) Inspected as specified in Bombardier 

Service Bulletin 670BA–32–048, dated 

August 29, 2014; or Bombardier Service 

Bulletin 670BA–32–048, Revision A, 

September 5, 2014; or Bombardier Service 

Bulletin 670BA–32–048, Revision B, 

September 2, 2015. 

(2) Restored as specified in Bombardier 

Task Number 320100–210, to Bombardier 

CRJ Series Regional Jet MRM, Part 1, CSP B– 

053. 

(3) Repaired as specified in one or more of 

the Bombardier Repair Engineering Orders 

(REO) specified in paragraphs (h)(3)(i) 

through (h)(3)(iii) of this AD. 

(i) Bombardier REO 670–32–11–313, 

Revision A, March 18, 2014. 

(ii) Bombardier REO 670–32–11–361, dated 

July 30, 2014. 

(iii) Bombardier REO 698–32–11–008, 

dated July 30, 2014. 

(i) No Alternative Actions or Intervals 

After the maintenance or inspection 

program has been revised, as required by 

paragraph (g) of this AD, no alternative 

actions (e.g., inspections) or intervals may be 

used unless the actions or intervals are 

approved as an alternative method of 

compliance (AMOC) in accordance with the 

procedures specified in paragraph (j)(1) of 

this AD. 

(j) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York ACO 

Branch, 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 certification office, 

send it to ATTN: Program Manager, 

Continuing Operational Safety, FAA, New 

York ACO Branch, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 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. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain corrective 

actions from a manufacturer, the action must 

be accomplished using a method approved 

by the Manager, New York ACO Branch, 

FAA; or Transport Canada Civil Aviation 

(TCCA); or Bombardier, Inc.’s TCCA Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(k) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) Canadian 

AD CF–2017–38, dated December 20, 2017, 

for related information. This MCAI may be 

found in the AD docket on the internet at 

http://www.regulations.gov by searching for 

and locating Docket No. FAA–2018–0551. 

(2) For more information about this AD, 

contact Darren Gassetto, Aerospace Engineer, 

Airframe and Mechanical Systems Section, 

FAA, New York ACO Branch, 1600 Stewart 

Avenue, Suite 410, Westbury, NY 11590; 

telephone 516–228–7323; fax 516–794–5531; 

email 9-avs-nyaco-cos@faa.gov. 

(3) For service information identified in 

this AD, contact Bombardier, Inc., 400 CoˆteVerDate Sep<11>2014 17:10 Jul 05, 2018 Jkt 244001 PO 00000 Frm 00036 Fmt 4702 Sfmt 4702 E:\FR\FM\06JYP1.SGM 06JYP1

daltland on DSKBBV9HB2PROD with PROPOSALSEP06JY18.000</GPH>
Federal Register / Vol. 83, No. 130 / Friday, July 6, 2018 / Proposed Rules 31507 

Vertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; Widebody Customer Response 

Center North America toll-free telephone 1– 

866–538–1247 or direct-dial telephone 1– 

514–855–2999; fax 514–855–7401; email 

ac.yul@aero.bombardier.com; internet http:// 

www.bombardier.com. You may view this 

service information at the FAA, Transport 

Standards Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

Issued in Des Moines, Washington, on June 

12, 2018. 

Michael Kaszycki, 

Acting Director, System Oversight Division, 

Aircraft Certification Service. 

[FR Doc. 2018–13360 Filed 7–5–18; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2018–0580; Product 

Identifier 2018–NM–025–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 737–300, 

–400, and –500 series airplanes. This 

proposed AD was prompted by a report 

indicating that the primary latch 

securing the passenger service unit 

(PSU) to the airplane structure is not 

adequate for the higher loads 

experienced during survivable 

accidents. This proposed AD would 

require installing lanyard assemblies on 

the PSU and, for certain airplanes, on 

the life vest panel. We are proposing 

this AD to address the unsafe condition 

on these products. 

DATES: We must receive comments on 

this proposed AD by August 20, 2018. 

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 NPRM, contact Boeing Commercial 

Airplanes, Attention: Contractual & Data 

Services (C&DS), 2600 Westminster 

Blvd., MC 110–SK57, Seal Beach, CA 

90740–5600; telephone 562–797–1717; 

internet https://

www.myboeingfleet.com. You may view 

this referenced service information at 

the FAA, Transport Standards Branch, 

2200 South 216th St., Des Moines, WA. 

For information on the availability of 

this material at the FAA, call 206–231– 

3195. It is also available on the internet 

at http://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2018–0580. 

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–2018– 

0580; 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 NPRM, 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: 

Scott Craig, Aerospace Engineer, Cabin 

Safety and Environmental Systems 

Section, FAA, Seattle ACO Branch, 2200 

South 216th St., Des Moines, WA 98198; 

phone and fax: 206–231–3566; email: 

Michael.S.Craig@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– 

2018–0580; Product Identifier 2018– 

NM–025–AD’’ at the beginning of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this NPRM. We will consider 

all comments received by the closing 

date and may amend this NPRM 

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 have received a report indicating 

that the primary latch securing the PSU 

to the airplane structure is not adequate 

for the higher loads experienced during 

survivable accidents. In addition, there 

is no secondary means of retention 

(lanyards) for the PSU to the airplane 

structure. This condition, if not 

corrected, could result in the PSU 

becoming detached and falling into the 

cabin, which could lead to passenger 

injuries and impede egress during an 

evacuation. 

Related Service Information Under 1 

CFR Part 51 

We reviewed Boeing Service Bulletin 

737–25–1728, dated October 10, 2016. 

The service information describes 

procedures for installing lanyard 

assemblies on the PSU and life vest 

panels. 

We reviewed Boeing Requirements 

Bulletin 737–25–1758 RB, dated 

November 8, 2017. The service 

information describes procedures for 

installing lanyard assemblies on the 

PSU. 

These documents are distinct since 

they apply to different airplane models 

in different configurations. 

This service information is reasonably 

available because the interested parties 

have access to it through their normal 

course of business or by the means 

identified in the ADDRESSES section. 

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 the same 

type design. 

Proposed AD Requirements 

This proposed AD would require 

accomplishment of the actions 

identified as ‘‘RC’’ (required for 

compliance) in the Accomplishment 

Instructions of Boeing Service Bulletin 

737–25–1728, dated October 10, 2016, 

described previously, except for any 

differences identified as exceptions in 

the regulatory text of this proposed AD. 

This proposed AD would also require 

accomplishment of the actions 

identified in the Boeing Requirements 

Bulletin 737–25–1758 RB, dated 

November 8, 2017, described 

previously, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

For information on the procedures 

and compliance times, see this service 

information at http://

www.regulations.gov by searching for 


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