Federal Register / Vol. 75, No. 241 / Thursday, December 16, 2010 / Rules and Regulations 78591 

TABLE 2—MATERIAL INCORPORATED BY REFERENCE

Document— Revision— Date— 

Boeing Alert Service Bulletin 777–57A0051 ................................................................................. Original ........................ May 15, 2006 

Boeing Alert Service Bulletin 777–57A0057 ................................................................................. 1 ................................... August 2, 2007 

Boeing Alert Service Bulletin 777-57A0059 .................................................................................. Original ........................ October 30, 2008 

Boeing Service Bulletin 777–57A0050 .......................................................................................... 2 ................................... May 14, 2009 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

this service information under 5 U.S.C. 

552(a) and 1 CFR part 51. 

(2) For service information identified in 

this 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; e-mail me.boecom@boeing.com; 

Internet https://www.myboeingfleet.com. 

(3) You may review copies of the 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. 

(4) You may also review copies of the 

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/ 

code_of_federal_regulations/ 

ibr_locations.html. 

Issued in Renton, Washington, on 

November 18, 2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–30606 Filed 12–15–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2008–1098; Directorate 

Identifier 2008–NM–108–AD; Amendment 

39–16532; AD 2010–24–13] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 747–100, 747–100B, 

747–100B SUD, 747–200B, 747–200C, 

747–200F, 747–300, 747SR, and 747SP 

Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for the 

products listed above. This AD requires 

adding two new indicator lights on a 

certain panel to inform the captain and 

first officer of a low pressure condition 

in the left and right override/jettison 

pumps of the center wing tanks. This 

AD also requires replacing the left and 

right override/jettison switches on the 

M154 fuel control module on the P4 

panel with improved switches and 

doing the associated wiring changes. 

This AD also requires, for certain 

airplanes, installation of a mounting 

bracket for the new indicator lights. 

This AD also requires a revision to the 

maintenance program to incorporate 

airworthiness limitation No. 28–AWL– 

22. This AD also requires a revision to 

the airplane flight manual to advise the 

flightcrew what to do in the event that 

the pump low pressure light on the 

flight engineer’s panel does not 

illuminate when the pump is selected 

off. This AD was prompted by fuel 

system reviews conducted by the 

manufacturer. We are issuing this AD to 

prevent uncommanded operation of the 

override/jettison pumps of the center 

wing tanks, and failure to manually shut 

off the override/jettison pumps at the 

correct time, either of which could lead 

to an ignition source inside the center 

wing tank. This condition, in 

combination with flammable fuel 

vapors, could result in a center fuel tank 

explosion and consequent loss of the 

airplane. 

DATES: This AD is effective January 20, 

2011. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of January 20, 2011. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain other publication listed in 

this AD as of June 12, 2008 (73 FR 

25977, May 8, 2008). 

ADDRESSES: For service information 

identified in this 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; e-mail 

me.boecom@boeing.com; 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 AD, 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: 

Douglas Bryant, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6505; fax (425) 917–6590; email: douglas.n.bryant@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a supplemental notice of 

proposed rulemaking (NPRM) to amend 

14 CFR part 39 to include an 

airworthiness directive (AD) that would 

apply to the specified products. That 

supplemental NPRM published in the 

Federal Register on October 1, 2010 (75 

FR 60661). That supplemental NPRM 

proposed to require adding two new 

indicator lights on the P10 panel to 

inform the captain and first officer of a 

low pressure condition in the left and 

right override/jettison pumps of the 

center wing tanks. That supplemental 

NPRM also proposed to require 

replacing the left and right override/ 

jettison switches on the M154 fuel 

control module on the P4 panel with 

improved switches and doing the 

associated wiring changes. That 

supplemental NPRM also proposed to 

require, for certain airplanes, 

installation of a mounting bracket for 

the new indicator lights. That 

supplemental NPRM also proposed to 

require a revision to the maintenance 

program to incorporate airworthiness 


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78592 Federal Register / Vol. 75, No. 241 / Thursday, December 16, 2010 / Rules and Regulations 

limitation No. 28–AWL–22. That 

supplemental NPRM also proposed to 

require a revision to the airplane flight 

manual to advise the flightcrew what to 

do in the event that the pump low 

pressure light on the flight engineer’s 

panel does not illuminate when the 

pump is selected off. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

received no comments on the 

supplemental NPRM or on the 

determination of the cost to the public. 

Clarification 

In our response in the supplemental 

NPRM to Northwest Airline’s Request to 

Reference Later Revision of Service 

Bulletin Cited in Original NPRM, we 

described some of the changes in Boeing 

Service Bulletin 747–28A2288, Revision 

1, dated January 21, 2010. That service 

bulletin was described as having 

installation instructions for the LOW 

PRESS indicator lights for airplanes that 

did not have the warning panel (i.e., the 

P10 panel) installed. We also described 

the changes to paragraph (g) of the 

Supplemental NPRM. We have revised 

the Summary and paragraph (g) of this 

AD to clarify that both groups of 

airplanes, with or without the warning 

panel installed, must install the two 

new indicator lights on certain panels 

(either the P10 panel, or for those 

airplanes without the P10 panel 

installed, the Autopilot Flight Director 

panel). 

Conclusion 

We reviewed the relevant data and 

determined that air safety and the 

public interest require adopting the AD 

as proposed. 

Costs of Compliance 

We estimate that this AD affects 185 

airplanes of U.S. registry. 

We estimate the following costs to 

comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per product Cost on U.S. 

operators 

Boeing Service Bulletin 747-28A2288, 

Revision 1.

Between 30 and 32 work-hours × $85 per 

hour = Between $2,550 and $2,720.

Between $2,768 and 

$2,868.

Between $5,318 and 

$5,588.

Between $983,830 

and $1,033,780. 

AFM revision .............. 1 work-hour × $85 per hour = $85 ................. None .......................... $85 ............................. $15,725 

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 

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): 

2010–24–13 The Boeing Company: 

Amendment 39–16532; Docket No. 

FAA–2008–1098; Directorate Identifier 

2008–NM–108–AD. 

Effective Date 

(a) This AD is effective January 20, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to The Boeing 

Company Model 747–100, 747–100B, 747– 

100B SUD, 747–200B, 747–200C, 747–200F, 

747–300, 747SR, and 747SP series airplanes, 

certificated in any category; as identified in 

Boeing Service Bulletin 747–28A2288, 

Revision 1, dated January 21, 2010. 

Note 1: This AD requires revisions to 

certain operator maintenance documents to 

include a new inspection. Compliance with 

this inspection is required by 14 CFR 

91.403(c). For airplanes that have been 

previously modified, altered, or repaired in 

the areas addressed by this inspection, the 

operator may not be able to accomplish the 

inspections 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 (AMOC) 

according to paragraph (l) of this AD. The 

request should include a description of 

changes to the required inspection that will 

ensure the continued operational safety of 

the airplane. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 28: Fuel. 

Unsafe Condition 

(e) This AD results from fuel system 

reviews conducted by the manufacturer. The 

Federal Aviation Administration is issuing 

this AD to prevent uncommanded operation 

of the override/jettison pumps of the center 

wing tanks, and failure to manually shut off 


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Federal Register / Vol. 75, No. 241 / Thursday, December 16, 2010 / Rules and Regulations 78593 

the override/jettison pumps at the correct 

time, either of which could lead to an 

ignition source inside the center wing tank. 

This condition, in combination with 

flammable fuel vapors, could result in a 

center fuel tank explosion and consequent 

loss of the airplane. 

Compliance 

(f) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Installation of Indicator Lights and 

Replacement of Switches 

(g) Within 36 months after the effective 

date of this AD: For airplanes with a P10 

panel installed, add two new indicator lights 

on the P10 panel to inform the captain and 

first officer of a low pressure condition in the 

left and right override/jettison pumps of the 

center wing tanks, and, for airplanes that do 

not have the warning panel (P10 panel) 

installed, add a mounting bracket and two 

new indicator lights to the Autopilot Flight 

Director panel; and replace the left and right 

override/jettison switches on the M154 fuel 

control module on the P4 panel with 

improved switches; and do the associated 

wiring changes. Accomplish these actions by 

doing all of the applicable actions specified 

in the Accomplishment Instructions of 

Boeing Service Bulletin 747–28A2288, 

Revision 1, dated January 21, 2010, except 

where that service bulletin states ‘‘20–60–00,’’ 

the correct sub-section number is ‘‘28–60– 

06,’’ and except as described in Table 1 of 

this AD. 

TABLE 1—PART NUMBER CORRECTION

Part name 

Part number specified in 

Figures 22 through 32 of 

Boeing Service Bulletin 

747-28A2288, Revision 1, 

dated January 21, 2010 

Part name of correct part Correct part number 

Nut ................................................................ BACN10JC06CD Nut ................................................................ BACN10NW1 

Bolt ............................................................... BACS12HN06–10 Screw ........................................................... BACS12HN04–6 

Washer ......................................................... NAS1149D0632J Washer ......................................................... NAS1149DN416J 

Note 2: For airplanes equipped with 

certain M154 fuel control modules, 

paragraph 2.C.2 of Boeing Service Bulletin 

747–28A2288, Revision 1, dated January 21, 

2010, refers to the BAE Systems service 

bulletins identified in Table 2 of this AD, as 

applicable, as additional sources of guidance 

for replacing the switches. 

TABLE 2—ADDITIONAL SOURCES OF

GUIDANCE

Service bulletin Date 

BAE Systems Service Bulletin 65B46124-28-01.February 16, 

2006. 

BAE Systems Service Bulletin 65B46124-28-02.March 28, 2007. 

BAE Systems Service Bulletin 65B46124-28-03.March 28, 2007. 

BAE Systems Service Bulletin 65B46214-28-01.February 16, 

2006. 

BAE Systems Service Bulletin 65B46214-28-02.March 28, 2007. 

BAE Systems Service Bulletin 65B46214-28-03.March 28, 2007. 

Maintenance Program Revision 

(h) Concurrently with accomplishing the 

actions required by paragraph (g) of this AD, 

revise the maintenance program by 

incorporating Airworthiness Limitation 

(AWL) No. 28–AWL–22 of Section D of the 

Boeing 747–100/200/300/SP Airworthiness 

Limitations (AWLs) and Certification 

Maintenance Requirements (CMRs), D6– 

13747–CMR, Revision March 2008. Where 

the AWL states ‘‘28–31–00,’’ the correct 

section number is ‘‘28–42–00.’’ 

Airplane Flight Manual (AFM) Revision 

(i) Concurrently with accomplishing the 

actions required by paragraph (g) of this AD, 

revise Section 1, ‘‘Certificate Limitations,’’ of 

the applicable Boeing 747 AFM to include 

the following statement. This may be done by 

inserting a copy of this AD into the AFM. 

‘‘When the center tank override jettison 

pumps are selected off, the amber pump low 

pressure lights on the Flight Engineer’s panel 

should illuminate and remain on. If a pump 

low pressure light on the Flight Engineer’s 

panel does not illuminate, open the 

associated pump circuit breaker.’’ 

Note 3: When a statement identical to that 

in paragraph (i) of this AD has been included 

in the general revisions of the AFM, the 

general revisions may be inserted into the 

AFM, and the copy of this AD may be 

removed from the AFM. 

No Alternative Inspections or Inspection 

Intervals 

(j) After accomplishing the action specified 

in paragraph (h) of this AD, no alternative 

inspections or inspection intervals may be 

used unless the inspections or inspection 

intervals are approved as an AMOC in 

accordance with the procedures specified in 

paragraph (l) of this AD. 

Terminating Action for Maintenance 

Program Revision 

(k) Incorporating AWL No. 28–AWL–22 

into the maintenance program in accordance 

with paragraph (g) of AD 2008–10–07, 

Amendment 39–15513, or AD 2008–10–07 

R1, Amendment 39–16070, terminates the 

action required by paragraph (h) of this AD. 

Alternative Methods of Compliance 

(AMOCs) 

(l)(1) The Manager, Seattle Aircraft 

Certification Office (ACO), FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. Send information to Attn: 

Douglas Bryant, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, Seattle 

ACO, 1601 Lind Avenue SW., Renton, 

Washington 98057–3356; telephone (425) 

917–6505; fax (425) 917–6590. Information 

may be e-mailed to: 9–ANM–Seattle-ACO– 

AMOC–Requests@faa.gov. 

(2) To request a different method of 

compliance or a different compliance time 

for this AD, follow the procedures in 14 CFR 

39.19. Before using any approved AMOC on 

any airplane to which the AMOC applies, 

notify your principal maintenance inspector 

(PMI) or principal avionics inspector (PAI), 

as appropriate, or lacking a principal 

inspector, your local Flight Standards District 

Office. The AMOC approval letter must 

specifically reference this AD. 

Related Information 

(m) For more information about this AD, 

contact Douglas Bryant, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue SW., Renton, Washington 98057– 

3356; telephone (425) 917–6505; fax (425) 

917–6590; e-mail: douglas.n.bryant@faa.gov. 

Material Incorporated by Reference 

(n) You must use Boeing Service Bulletin 

747–28A2288, Revision 1, dated January 21, 

2010; and Boeing 747–100/200/300/SP 

Airworthiness Limitations (AWLs) and 

Certification Maintenance Requirements 

(CMRs), D6–13747–CMR, Revision March 

2008; as applicable; to do the actions 

required by this AD, unless the AD specifies 

otherwise. 

(1) The Director of the Federal Register 

approved the incorporation by reference 

Boeing Service Bulletin 747–28A2288, 

Revision 1, dated January 21, 2010, under 5 

U.S.C. 552(a) and 1 CFR part 51. 

(2) The Director of the Federal Register 

previously approved the incorporation by 

reference of Boeing 747–100/200/300/SP 

Airworthiness Limitations (AWLs) and 

Certification Maintenance Requirements 

(CMRs), D6–13747–CMR, Revision March 

2008, on June 12, 2008 (73 FR 25977, May 

8, 2008). 

(3) For service information identified in 

this 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– 


jlentini on DSKJ8SOYB1PROD with RULES
78594 Federal Register / Vol. 75, No. 241 / Thursday, December 16, 2010 / Rules and Regulations 

5680; e-mail me.boecom@boeing.com; 

Internet https://www.myboeingfleet.com. 

(4) You may review copies of the 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. 

(5) You may also review copies of the 

service information that is incorporated by 

reference at the National Archives and 

Records Administration (NARA). For 

information on the availability of this 

material at an NARA facility, call 202–741– 

6030, or go to http://www.archives.gov/ 

federal_register/code_of_federal_regulations/ 

ibr_locations.html. 

Issued in Renton, Washington, on 

November 18, 2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–30612 Filed 12–15–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0430; Directorate 

Identifier 2008–NM–148–AD; Amendment 

39–16540; AD 2010–26–01] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 777–200 Series 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

Model 777–200 series airplanes. This 

AD requires installing a new insulation 

blanket on the latch beam firewall of 

each thrust reverser (T/R) half. This AD 

results from an in-flight shutdown due 

to an engine fire indication; an undercowl engine fire was extinguished after 

landing. The cause of the fire was 

uncontained failure of the starter in the 

engine core compartment; the fire 

progressed into the latch beam cavity 

and was fueled by oil from a damaged 

integrated drive generator oil line. We 

are issuing this AD to prevent a fire 

from entering the cowl or strut area, 

which could weaken T/R parts and 

result in reduced structural integrity of 

the T/R, possible separation of T/R parts 

during flight, and consequent damage to 

the airplane and injury to people or 

damage to property on the ground. 

DATES: This AD is effective January 20, 

2011. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of January 20, 2011. 

ADDRESSES: For service information 

identified in this 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; e-mail 

me.boecom@boeing.com; Internet 

https://www.myboeingfleet.com. 

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 AD, the regulatory 

evaluation, any comments received, and 

other information. The address for the 

Docket Office (telephone 800–647–5527) 

is the 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: 

Margaret Langsted, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6500; fax (425) 917–6590. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an airworthiness 

directive (AD) that would apply to 

certain Boeing Model 777–200 series 

airplanes. That NPRM was published in 

the Federal Register on May 7, 2009 (74 

FR 21284). That NPRM proposed to 

require installing a new insulation 

blanket on the latch beam firewall of 

each thrust reverser (T/R) half. 

Relevant Service Information 

Since we issued the NPRM, we have 

reviewed Boeing Alert Service Bulletin 

777–78A0066, Revision 2, dated April 8, 

2010. Boeing Service Bulletin 777– 

78A0066, Revision 1, dated March 12, 

2009, was referred to in the original 

NPRM as the appropriate source of 

service information for accomplishing 

the proposed actions. No more work is 

necessary for airplanes on which 

Revision 1 of this service bulletin was 

used for doing the actions. Boeing Alert 

Service Bulletin 777–78A0066, Revision 

2, dated April 8, 2010, moves certain 

airplanes to Group 1, and contains 

minor editorial changes. 

We have revised paragraphs (c) and 

(g) of this AD to refer to Revision 2 of 

Boeing Alert Service Bulletin 777– 

78A0066, Revision 2, dated April 8, 

2010, and paragraph (h) to add credit for 

accomplishing the specified actions in 

accordance with Boeing Service Bulletin 

777–78A0066, Revision 1, dated March 

12, 2009. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

considered the comments received. 

Request To Clarify Description of 

Unsafe Condition 

Boeing asked that we clarify the 

description of the unsafe condition by 

removing the words ‘‘or strut’’ from the 

identified description. Boeing stated 

that the unsafe condition, as currently 

written, is not correct. Boeing did not 

provide the reason that the description 

is not correct. 

We disagree that the description of 

the unsafe condition should be clarified 

by removing ‘‘or strut’’ from the 

description. A fire in the lower latch 

beam area that burns through an 

inadequate firewall may propagate into 

the strut. We have made no change to 

the AD in this regard. 

Request To Clarify Applicability 

Japan Airlines International (JALI) 

asked for clarification of the 

applicability specified in the NPRM. 

JALI stated that the applicability 

specifies Model 777–200 series 

airplanes identified in Boeing Service 

Bulletin 777–78A0066, Revision 1, 

dated March 12, 2009. JALI noted that 

the service bulletin specifies its 

effectivity as delivered condition, and 

the proposed rule is considered to be 

applicable to each T/R half that has 

been installed on airplanes with the 

applicable serial numbers. JALI added 

that the T/R half is a replaceable line 

unit and the installed airplane and/or 

engine position will be changed from 

the delivered condition in the future; 

the T/R half that is not necessary for 

doing the requirements in the NPRM 

may be installed on an airplane 

identified in the applicability. 

JALI stated that, in light of these 

factors, it is not clear whether 

compliance with the specified actions 

has been met. JALI asked that we clarify 

the applicability either to note that the 

NPRM does not apply to airplanes on 

which a T/R is installed with a design 

change known as ‘‘Commonality T/R,’’ 

which is common to Model 777–300 

series airplanes, or to change the 


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