Federal Register / Vol. 82, No. 219 / Wednesday, November 15, 2017 / Rules and Regulations 52827 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2017–0659; Product 

Identifier 2017–CE–014–AD; Amendment 

39–19094; AD 2017–22–14] 

RIN 2120–AA64 

Airworthiness Directives; Rockwell 

Collins, Inc. Traffic Surveillance 

System Processing Unit 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

Rockwell Collins, Inc. TSS–4100 Traffic 

Surveillance System Processing Units 

that incorporate TSSA–4100 Field 

Loadable Software (FLS) Rockwell 

Collins part numbers 810–0052–002/– 

003/–010/–011/–012/–100/–101 and are 

installed on airplanes. This AD was 

prompted by five instances of air traffic 

control observing coasting (extrapolated 

stale data) of automatic dependent 

surveillance-broadcast data (position/ 

velocity data). This AD requires 

installing the TSSA–4100 FLS upgrades 

on the TSS–4100 units. We are issuing 

this AD to address the unsafe condition 

on these products. 

DATES: This AD is effective December 

20, 2017. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 20, 2017. 

ADDRESSES: For service information 

identified in this final rule, contact 

Rockwell Collins, Inc., Collins Aviation 

Services, 400 Collins Road NE., M/S 

164–100, Cedar Rapids, IA 52498–0001; 

telephone: 888–265–5467 (U.S.) or 319– 

265–5467; fax: 319–295–4941 (outside 

U.S.); email: techmanuals@

rockwellcollins.com; Internet: https://

portal.rockwellcollins.com/web/ 

publications-and-training. You may 

view this service information at the 

FAA, Policy and Innovation Division, 

901 Locust, Kansas City, Missouri 

64106. For information on the 

availability of this material at the FAA, 

call (816) 329–4148. It is also available 

on the internet at http://

www.regulations.gov by searching for 

and locating Docket No. FAA–2017– 

0659. 

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–2017– 

0659; 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 final rule, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

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

Document 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: Paul 

Rau, Aerospace Engineer, Wichita 

Aircraft Certification Office, FAA, 1801 

Airport Road, Room 100, Wichita, 

Kansas 67209; phone: 316–946–4149; 

fax: 316–946–4107; email: paul.rau@

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 Rockwell Collins, Inc. 

TSS–4100 Traffic Surveillance System 

Processing Units that incorporate 

TSSA–4100 Field Loadable Software 

(FLS) Rockwell Collins part numbers 

810–0052–002/–003/–010/–011/–012/– 

100/–101 and are installed on airplanes. 

The NPRM published in the Federal 

Register on July 3, 2017 (82 FR 30802). 

The NPRM was prompted by five 

instances of air traffic control observing 

coasting (extrapolated stale data) 

automatic dependent surveillancebroadcast data (ADS–B position/velocity 

data) on a related Rockwell Collins, Inc. 

platform that shares a common 

architecture with the TSS–4100 Traffic 

Surveillance System Processing Units. 

An investigation of the events 

determined that the ADS–B position 

and the Mode S/traffic alert and 

collision avoidance system (TCAS) 

altitude of the TSS–4100 are affected. 

This condition, if not corrected, could 

result in misleading position and/or 

altitude being reported by the airplane. 

Misleading altitude data can adversely 

affect TCAS and possibly lead to midair collision due to an incorrect initial 

resolution advisory (RA) and/or an 

incorrect RA modification. The 

extrapolation of the data occurs with no 

warning to the crew. The NPRM 

proposed to require updating the TSSA– 

4100 FLS on the TSS–4100 Traffic 

Surveillance System Processing Unit. 

We are issuing this AD to correct the 

unsafe condition on these products. 

Comments 

We gave the public the opportunity to 

participate in developing this final rule. 

The following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request Reduced Compliance Time 

The Air Line Pilots Association 

(ALPA) requested we reduce the 

compliance time for the AD actions. The 

ALPA requested this change because of 

the high number of reports the FAA 

received and because the equipment is 

installed on a variety of airframe types 

that may operate in heavily trafficked 

airspace. 

We disagree with this comment. We 

considered the variety of airframe types 

and operations when we determined the 

compliance time for the proposed AD. 

We proposed within 12 months or 750 

hours time-in-service (TIS), whichever 

occurs first, and we expect that 

airframes with the heaviest usage will 

require compliance in less than 4 

months after the effective date of the 

AD. Reducing the compliance time 

would create an additional burden not 

supported by the risk assessments. 

We have not changed this AD based 

on this comment. 

Request a Delayed Effective Date 

Bombardier, Inc. requested we delay 

the effective date of this AD until 

January 1, 2020, when the requirements 

of 14 CFR 91.225 take effect. In 

November 2017, Bombardier, Inc. plans 

to release service information for CRJ 

airplane models that will change the 

affected TSSA–4100 FLS part numbers 

to different part numbers that are not 

included the applicability of the AD. 

Because of the heavy usage of the CRJ 

airplanes and the 750 hours TIS of the 

AD, most CRJ airplanes will require 

compliance with the AD by the end of 

2017. Also, Bombardier, Inc. states that 

air traffic controllers cannot use ADS– 

B data as a primary source until 2020; 

as such, the mid-air collision risk does 

not seem clear to them. 

We disagree with this comment. 

Based on the stated usage, a delay of the 

effective date until January 1, 2020, 

could result in airplanes accumulating 

an additional 5,000 hours TIS beyond 

the 750 hours TIS compliance proposed 

in the NPRM. The risk assessment does 

not support that significant of an 

increase in the compliance time for this 

AD. The stale or coasting Mode S 

altitude data interferes with proper 

TCAS operation, potentially resulting in 

an incorrect RA or RA modification. 

ADS–B operation is not required for that 

unsafe condition to exist. As of August 


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52828 Federal Register / Vol. 82, No. 219 / Wednesday, November 15, 2017 / Rules and Regulations 

1, 2017, ADS–B is the primary source of 

data by air traffic controllers for 

separation at all FAA enroute air traffic 

control facilities and at over 60 percent 

of U.S. terminal air traffic control 

facilities. ADS–B is also widely used by 

general aviation airplanes for traffic 

awareness. You may provide 

substantiating data to adjust the 

compliance time of this AD and request 

an alternative method of compliance 

(AMOC) using the procedures found in 

14 CFR 39.19. 

We have not changed this AD based 

on this comment. 

Request To Allow Subsequent FLS Part 

Numbers for Compliance 

Delta Air Lines, Inc. requested we 

change the language in this AD to allow 

the use of subsequent FLS part numbers 

for compliance with this AD. They 

request, for example, we add the words, 

‘‘or subsequent’’ or ‘‘any subsequent 

FLS part number that complies with the 

intent of this AD’’ to allow the use of 

future part numbers that may comply 

with the AD actions. 

We disagree with this comment. 

RCPN 810–0052–013 or 810–0052–102 

are the only part numbers currently 

available that comply with this AD. We 

cannot use language ‘‘or subsequent’’ or 

similar language because we cannot 

approve documents or materials that do 

not currently exist. The AD only applies 

to the FLS part numbers listed in the 

Applicability, paragraph (c) of this AD, 

so future software upgrades not listed in 

paragraph (c) of this AD are not affected 

by this AD. Operators may request an 

alternative method of compliance 

(AMOC) to use future FLS part numbers 

if they become available using the 

procedures found in 14 CFR 39.19. 

We have not changed this AD based 

on this comment. 

Request To Allow Credit for Work Done 

With Other Instructions 

Bombardier, Inc. requested that we 

allow AD credit for operators who have 

already completed the replacement of 

the affected part numbers using parts 

found in aircraft illustrated parts 

catalogs (AIPCs) not identified in the 

Applicability, paragraph (c) of this AD. 

Certain AIPCs already allow operators to 

replace some of the affected TSSA–4100 

FLS part numbers with part numbers 

not identified in the Applicability, 

paragraph (c) of this AD. 

We disagree with this comment. We 

recognize that other instructions for 

upgrade of the TSSA–4100 exist. 

However, the actions of this AD must be 

completed using the service information 

cited in the AD and incorporated by 

reference into the AD. Operators may 

request an AMOC, using the procedures 

found in 14 CFR 39.19, to use service 

information other than those referenced 

in this AD. If, as of the effective date of 

this AD, the affected TSSA–4100 FLS 

part numbers identified in the 

Applicability, paragraph (c) of this AD, 

are not installed on the airplane, the AD 

does not apply to that airplane. 

Therefore, if before the effective date of 

this AD, operators replaced the affected 

TSSA–4100 FLS part numbers with part 

numbers not identified in the 

Applicability, paragraph (c) of this AD, 

using the AIPC, they do not require 

credit for compliance with this AD 

because this AD does not apply to those 

airplanes. 

We have not changed this AD based 

on this comment. 

Request Changes to the List of Possible 

Affected Airplanes 

Delta Air Lines, Inc. and Bombardier, 

Inc. requested we add Bombardier, Inc. 

Models CS 100 (BD–500–1A10) and 

CS300 (BD–500–1A11) airplanes and 

remove Bombardier, Inc. Models Global 

5000 (BD–700–1A11) and Challenger 

605 (CL–600–2B16) from the 

Applicability, paragraph (c) of this AD. 

The C series include the TSSA–4100 

system; however, the Global 5000 and 

the Challenger 605 do not have the 

affected part numbers installed. 

We agree with this comment. The list 

of possible affected airplanes is 

intended to include airplanes known to 

have the TSS–4100 installed. The 

Bombardier C series airplanes were 

inadvertently omitted, and we added 

them to the Applicability, paragraph (c) 

of this AD. The Global 5000 without the 

Global Vision Flight Deck and the 

Challenger 605 did not include the 

installation of the TSS–4100, and we 

removed them from the Applicability, 

paragraph (c) of this AD. However, this 

AD applies specifically to TSS–4100 

units, RCPN 822–2132–001, that 

incorporate TSSA–4100 FLS RCPN 810– 

0052–002/–003/–010/–011/–012/–100/– 

101 installed on airplanes. If the TSS– 

4100 unit with the affected part 

numbers is installed, for example, 

through an avionics upgrade, on an 

airplane not listed in paragraph (c) of 

this AD, the AD would apply to that 

airplane. 

Request Clarification of the Unsafe 

Condition 

Bombardier, Inc. requested we change 

the language in the Unsafe Condition, 

paragraph (e) of this AD, to more 

accurately describe the instances of 

coasting errors. The five observed 

coasting errors were not observed on the 

TSS–4100 units but on different units 

with similar software. 

We agree with this comment. We did 

include more descriptive language in 

the preamble of the NPRM and this final 

rule. We added similar language to the 

Unsafe Condition in paragraph (e) of 

this AD to clarify the specific units 

where coasting error were observed. 

Conclusion 

We reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting this 

final rule with the changes described 

previously and minor editorial changes. 

We have determined that these minor 

changes: 

• Are consistent with the intent that 

was proposed in the NPRM for 

correcting the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM. 

We also determined that these 

changes will not increase the economic 

burden on any operator or increase the 

scope of this final rule. 

Related Service Information Under 1 

CFR Part 51 

We reviewed Rockwell Collins 

Service Information Letter, TSSA–4100– 

SIL–10–1, Revision No. 9, dated March 

31, 2017; and Rockwell Collins Service 

Information Letter, TSSA–4100–SIL– 

10–1, Revision No. 10, dated July 10, 

2017. The service letters both describe 

procedures for determining the part 

number of the affected FLS and the 

installation procedure for updating the 

FLS; however, Revision No. 10 contains 

minor editorial changes not included 

Revision No. 9. 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. 

Costs of Compliance 

We estimate that this AD affects 1,000 

products installed on airplanes of U.S. 

registry. 

We estimate the following costs to 

comply with this AD: 


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Federal Register / Vol. 82, No. 219 / Wednesday, November 15, 2017 / Rules and Regulations 52829 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Upgrade the FLS to RCPN 810–0052–013 or 

810–0052–102.

1 work-hour × $85 per hour = $85 ................. $700 $785 $785,000 

According to the manufacturer, some 

of the costs of this proposed AD may be 

covered by the manufacturer, thereby 

reducing the cost impact on affected 

individuals. We do not control 

manufacturer coverage for affected 

individuals. As a result, we have 

included all costs in our cost estimate. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

We are issuing this rulemaking under 

the authority described in Subtitle VII, 

Part A, Subpart III, Section 44701: 

‘‘General requirements.’’ Under that 

section, Congress charges the FAA with 

promoting safe flight of civil aircraft in 

air commerce by prescribing regulations 

for practices, methods, and procedures 

the Administrator finds necessary for 

safety in air commerce. This 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 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 small airplanes and 

domestic business jet transport 

airplanes to the Director of the Policy 

and Innovation Division. 

Regulatory Findings 

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, 

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 adding 

the following new airworthiness 

directive (AD): 

2017–22–14 Rockwell Collins, Inc.: 

Amendment 39–19094; Docket No. 

FAA–2017–0659; Product Identifier 

2017–CE–014–AD. 

(a) Effective Date 

This AD is effective December 20, 2017. 

(b) Affected ADs 

None. 

(c) Applicability 

Rockwell Collins, Inc. TSSA–4100 Field 

Loadable Software (FLS) Rockwell Collins 

part numbers (RCPNs) 810–0052–002, –003, 

–010, –011, –012, –100, or –101 found on 

TSS–4100 Traffic Surveillance System 

Processing Units, (RCPN) 822–2132–001 

installed on airplanes. 

(1) The FLS RCPNs 810–0052–002, –003, 

–010, –011, –012, –100, or –101 found on 

TSS–4100 Traffic Surveillance System 

Processing Units are known to be installed on 

but not limited to the airplanes listed in 

paragraphs (c)(1)(i) through (14) of this AD 

and are certificated in any category. 

(i) Bombardier Challenger 300 (BD–100– 

1A10) 

(ii) Bombardier Challenger 350 (BD–100– 

1A10) 

(iii) Bombardier Challenger 650 (CL–600– 

2B16) 

(iv) Bombardier CRJ–700 (CL–600–2C10) 

(v) Bombardier CRJ–900 (CL–600–2D24) 

(vi) Bombardier CRJ–1000 (CL–600–2E25) 

(vii) Bombardier CS100 (BD–500–1A10) 

(viii) Bombardier CS300 (BD–500–1A11) 

(ix) Bombardier Global 5000 equipped with 

Global Vision Flight Deck (BD–700– 

1A11) 

(x) Bombardier Global 6000 (BD–700–1A10) 

(xi) Cessna Citation CJ4 (525C) 

(xii) Embraer Legacy (EMB–550) 

(xiii) Embraer Legacy 450 (EMB–545) 

(xiv) Gulfstream G280 

(2) Earlier revision levels of the Rockwell 

Collins, Inc. service information and service 

information issued by airplane manufacturers 

before the effective date of this AD may have 

specified the installation of FLS with 

different FAA-approved part numbers than 

the part numbers listed in paragraph (c) of 

this AD. If, before December 20, 2017 (the 

effective date of this AD), a part number that 

is different than the TSSA–4100 RCPNs 

listed in paragraph (c) of this AD is installed 

on the airplane, this AD does not apply to 

that airplane. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 34, Navigation. 

(e) Unsafe Condition 

This AD was prompted by five instances of 

air traffic control observing coasting 

(extrapolated stale data) automatic dependent 

surveillance-broadcast data (ADS–B position/ 

velocity data) on a related Rockwell Collins, 

Inc. platform that shares a common 

architecture with the TSS–4100 Traffic 

Surveillance System Processing Units. We 

are issuing this AD to prevent erroneous 

extrapolation of position/velocity and 

altitude data that could result in misleading 

position and/or altitude being reported by the 

airplane and possibly lead to mid-air 

collision. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Upgrade of FLS 

Within the next 12 months after December 

20, 2017 (the effective date of this AD) or 

within the next 750 hours time-in-service 

after December 20, 2017 (the effective date of 

this AD), whichever occurs first, upgrade the 

TSSA–4100 FLS to RCPN 810–0052–013 or 

810–0052–102, as applicable, following 

Rockwell Collins Service Information Letter, 

TSSA–4100–SIL–10–1, Revision No. 9, dated 


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52830 Federal Register / Vol. 82, No. 219 / Wednesday, November 15, 2017 / Rules and Regulations 

March 31, 2017; or Rockwell Collins Service 

Information Letter TSSA–4100–SIL–10–1, 

Revision No. 10, dated July 10, 2017. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Wichita 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 

ACO, send it to the attention of the person 

identified in paragraph (i) of this AD. 

(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. 

(i) Related Information 

For more information about this AD, 

contact Paul Rau, Aerospace Engineer, 

Wichita ACO, FAA, 1801 Airport Road, 

Room 100, Wichita, Kansas 67209; phone: 

316–946–4149; fax: 316–946–4107; email: 

paul.rau@faa.gov. 

(j) 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) Rockwell Collins Service Information 

Letter, TSSA–4100–SIL–10–1, Revision No. 

9, dated March 31, 2017. 

(ii) Rockwell Collins Service Information 

Letter, TSSA–4100–SIL–10–1, Revision No. 

10, dated July 10, 2017. 

(3) For service information identified in 

this AD, contact Rockwell Collins, Inc., 

Collins Aviation Services, 400 Collins Road 

NE., M/S 164–100, Cedar Rapids, IA 52498– 

0001; telephone: 888–265–5467 (U.S.) or 

319–265–5467; fax: 319–295–4941 (outside 

U.S.); email: techmanuals@

rockwellcollins.com; Internet: https://

portal.rockwellcollins.com/web/publicationsand-training. 

(4) You may view this service information 

at FAA, Policy and Innovation Division, 901 

Locust, Kansas City, Missouri 64106. For 

information on the availability of this 

material at the FAA, call (816) 329–4148. It 

is also available on the internet at http://

www.regulations.gov by searching for and 

locating Docket No. FAA–2017–0659. 

(5) 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: 

Issued in Kansas City, Missouri, on 

October 26, 2017. 

Pat Mullen, 

Acting Manager, Small Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2017–24066 Filed 11–14–17; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2017–1000; Product 

Identifier 2017–NE–36–AD; Amendment 39– 

19100; AD 2017–23–06] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

General Electric Company (GE) CF34– 

8C1, CF34–8C5, CF34–8C5A1, and 

CF34–8C5B1 engines. This AD requires 

an inspection of the bleed air manifold 

link rod assemblies and the supply, 

return, and drain fuel fittings on the 

operability bleed valve (OBV). This AD 

was prompted by an engine fire that 

occurred as a result of malfunctions 

related to the OBV. We are issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective November 

30, 2017. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of November 30, 2017. 

We must receive comments on this 

AD by January 2, 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: 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 final rule, contact General Electric 

Company, GE-Aviation, Room 285, 1 

Neumann Way, Cincinnati, OH 45215, 

phone: 513–552–3272; fax: 513–552– 

3329; email: geae.aoc@ge.com. You may 

view this service information at the 

FAA, Engine and Propeller Standards 

Branch, 1200 District Avenue, 

Burlington, MA. For information on the 

availability of this material at the FAA, 

call 781–238–7125. 

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–2017– 

1000; 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 final rule, 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: John 

Frost, Aerospace Engineer, ECO Branch, 

FAA, 1200 District Avenue, Burlington, 

MA 01803; phone: 781–238–7756; fax: 

781–238–7199; email: john.frost@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We learned that significant fuel leaks, 

some resulting in engine fires, have 

occurred on multiple occasions due to 

malfunctions related to the OBVs. These 

valves typically dump operability air 

into the bleed plenum attached to the 

engine inner nacelle. The fuel fitting 

threads have pulled out of the valve 

body which has led to significant fuel 

leaks on at least four occasions. On two 

occasions, these leaks resulted in 

uncontrolled fires, resulting in 

significant damage to one of the affected 

airplanes. This condition, if not 

corrected, could result in failure of the 

OBV, engine fire, and damage to the 

airplane. We are issuing this AD to 

correct the unsafe condition on these 

products. 

Related Service Information Under 1 

CFR Part 51 

We reviewed GE Service Bulletin (SB) 

CF34–8C–AL S/B 75–0019, Revision 01, 

dated October 24, 2017. The SB 

describes procedures for inspecting the 

OBV. 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. 

Other Related Service Information 

We reviewed GE CF34–8C SB 75– 

0019 R00, dated August 4, 2017. The SB 

describes procedures for inspecting the 

OBV. 


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