65988 Federal Register / Vol. 76, No. 206 / Tuesday, October 25, 2011 / Proposed Rules 

may be imported from into the 

continental United States from Vietnam 

only under the following conditions: 

(a) Growing conditions. Litchi fruit 

must be grown in orchards registered 

with and monitored by the national 

plant protection organization (NPPO) of 

Vietnam to ensure that the fruit are free 

of disease caused by Phytophthora 

litchii. 

(b) Treatment. Litchi and longan fruit 

must be treated with irradiation for 

plant pests of the class Insecta, except 

pupae and adults of the order 

Lepidoptera, in accordance with part 

305 of this chapter. 

(c) Labeling. In addition to meeting 

the labeling requirements in part 305 of 

this chapter, cartons containing litchi or 

longan must be stamped ‘‘Not for 

importation into or distribution in FL.’’ 

(d) Commercial consignments. The 

litchi and longan fruit may be imported 

in commercial consignments only. 

(e) Phytosanitary certificates. (1) Each 

consignment of litchi fruit must be 

accompanied by a phytosanitary 

certificate issued by the NPPO of 

Vietnam attesting that the conditions of 

this section have been met and that the 

consignment was inspected in Vietnam 

and found free of Phytophthora litchii. 

(2) Each consignment of longan fruit 

must be accompanied by a 

phytosanitary certificate issued by the 

NPPO of Vietnam attesting that the 

conditions of this section have been 

met. 

Done in Washington, DC, this 19th day of 

October 2011. 

Kevin Shea, 

Acting Administrator, Animal and Plant 

Health Inspection Service. 

[FR Doc. 2011–27574 Filed 10–24–11; 8:45 am] 

BILLING CODE 3410–34–P 

DEPARTMENT OF AGRICULTURE 

Animal and Plant Health Inspection 

Service 

7 CFR Part 319 

[Docket No. APHIS–2011–0040] 

RIN 0579–AD52 

Importation of Mangoes From Australia 

AGENCY: Animal and Plant Health 

Inspection Service, USDA. 

ACTION: Proposed rule. 

SUMMARY: We are proposing to amend 

the regulations concerning the 

importation of fruits and vegetables to 

allow the importation of fresh mangoes 

from Australia into the continental 

United States. As a condition of entry, 

the mangoes would have to be produced 

in accordance with a systems approach 

employing a combination of mitigation 

measures for the fungus Cytosphaera 

mangiferae and would have to be 

inspected prior to exportation from 

Australia and found free of this disease. 

The mangoes would have to be 

imported in commercial consignments 

only and would have to be treated by 

irradiation to mitigate the risk of insect 

pests. The mangoes would also have to 

be accompanied by a phytosanitary 

certificate with an additional 

declaration that the conditions for 

importation have been met. This action 

would allow the importation of mangoes 

from Australia while continuing to 

protect against the introduction of plant 

pests into the United States. 

DATES: We will consider all comments 

that we receive on or before December 

27, 2011. 

ADDRESSES: You may submit comments 

by either of the following methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov/ 

#!documentDetail;D=APHIS-2011-0040- 

0001. 

• Postal Mail/Commercial Delivery: 

Send your comment to Docket No. 

APHIS–2011–0040, Regulatory Analysis 

and Development, PPD, APHIS, Station 

3A–03.8, 4700 River Road Unit 118, 

Riverdale, MD 20737–1238. 

Supporting documents and any 

comments we receive on this docket 

may be viewed at http:// 

www.regulations.gov/ 

#!docketDetail;D=APHIS-2011-0040 or 

in our reading room, which is located in 

room 1141 of the USDA South Building, 

14th Street and Independence Avenue, 

SW., Washington, DC. Normal reading 

room hours are 8 a.m. to 4:30 p.m., 

Monday through Friday, except 

holidays. To be sure someone is there to 

help you, please call (202) 690–2817 

before coming. 

FOR FURTHER INFORMATION CONTACT: Ms. 

Donna West, Senior Import Specialist, 

PPQ, APHIS, 4700 River Road Unit 39, 

Riverdale, MD 20737–1231; (301) 734– 

0627. 

SUPPLEMENTARY INFORMATION: 

Background 

The regulations in ‘‘Subpart—Fruits 

and Vegetables’’ (7 CFR 319.56–1 

through 319.56–52, referred to below as 

the regulations) prohibit or restrict the 

importation of fruits and vegetables into 

the United States from certain parts of 

the world to prevent the introduction 

and dissemination of plant pests that are 

new to or not widely distributed within 

the United States. 

The national plant protection 

organization (NPPO) of Australia has 

requested that the Animal and Plant 

Health Inspection Service (APHIS) 

amend the regulations to allow fresh 

mangoes from Australia to be imported 

into the continental United States. 

As part of our evaluation of 

Australia’s request, we prepared a pest 

risk assessment (PRA), titled 

‘‘Importation of Fresh Fruit of Mango, 

Mangifera indica L., from Australia into 

the Continental United States, A 

Pathway-Initiated Risk Analysis’’ (June 

2011). The PRA evaluated the risks 

associated with the importation of 

mangoes into the continental United 

States from Australia. 

The PRA identified 21 pests of 

quarantine significance present in 

Australia that could be introduced into 

the United States through the 

importation of mangoes: 

Fruit Flies 

• Bactrocera aquilonis 

• B. cucumis 

• B. frauenfeldi 

• B. jarvisi 

• B. kraussi 

• B. murrayi 

• B. neohumeralis 

• B. opiliae 

• B. tryoni 

• Ceratitis capitata 

Scales 

• Red wax scale (Ceroplastes rubens) 

• Green scale (Coccus viridis) 

Weevil 

• Mango seed weevil (Sternochetus 

mangiferae) 

Fungi 

• Cytosphaera mangiferae 

• Fusarium spp. complex (associated 

with mango malformation disease) 

• Lasioddiplodia pseudotheobraomae 

• Neofusicoccum mangiferae 

• Neoscytalidium novaehollandiae 

• Phomopsis mangiferae 

• Pseudofusicoccum adansoniae 

Bacterium 

• Xanthomonas campestris pv. 

mangiferaeindicae 

According to our PRA, for pests rated 

high risk (C. rubens, C. capitata, and the 

nine Bactrocera spp. fruit flies), specific 

phytosanitary measures beyond 

standard port-of-entry inspection are 

strongly recommended. For pests rated 

medium risk (C. viridis, C. mangiferae, 

L. pseudotheobraomae, N. mangiferae, 

N. novaehollandiae, P. adansoniae, S. 

mangiferae, and X. campestris pv. 

mangiferaeindicae), specific 

phytosanitary measures beyond 


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Federal Register / Vol. 76, No. 206 / Tuesday, October 25, 2011 / Proposed Rules 65989 

standard port-of-entry inspection may 

be necessary. For pests rated as low risk 

(the Fusarium spp. complex and P. 

mangiferae), specific phytosanitary 

measures beyond standard port-of-entry 

inspection are not required. To 

recommend specific measures to 

mitigate the risk posed by the pests 

identified in the PRA, we prepared a 

risk management document (RMD). 

Copies of the PRA and RMD may be 

obtained from the person listed under 

FOR FURTHER INFORMATION CONTACT or 

viewed on the Regulations.gov Web site 

(see ADDRESSES above for instructions 

for accessing Regulations.gov). 

Based on the recommendations of the 

RMD, we are proposing to allow the 

importation of mangoes from Australia 

into the continental United States only 

if they are produced in accordance with 

a systems approach. The systems 

approach we are proposing would 

require that mangoes be imported only 

under the conditions described below. 

These conditions would be added to the 

regulations in a new § 319.56–54. 

Mangoes would have to be imported 

in commercial consignments. Produce 

grown commercially is less likely to be 

infested with plant pests than 

noncommercial shipments. 

Noncommercial shipments are more 

prone to infestations because the 

commodity is often ripe to overripe, 

could be of a variety with unknown 

susceptibility to pests, and is often 

grown with little or no pest control. 

Commercial consignments, as defined in 

§ 319.56–2, are consignments that an 

inspector identifies as having been 

imported for sale and distribution. Such 

identification is based on a variety of 

indicators, including, but not limited to: 

Quantity of produce, type of packaging, 

identification of grower or packinghouse 

on the packaging, and documents 

consigning the fruits or vegetables to a 

wholesaler or retailer. 

The mangoes would have to be treated 

for insect pests, except pupae and adults 

of the order Lepidoptera, with 

irradiation in accordance with 7 CFR 

part 305, which contains the 

phytosanitary treatments regulations. 

The Plant Protection and Quarantine 

Treatment Manuel, which lists 

minimum absorbed irradiation doses for 

plant pests and classes of plant pests, 

includes a 400-gray dose for such pests. 

None of the pests associated with 

mangoes from Australia belong to the 

order Lepidoptera; therefore, this 

treatment would successfully mitigate 

the risk of all 13 insect pests associated 

with mangoes from Australia. 

Within part 305, § 305.9 contains a 

number of other requirements for 

irradiation treatment, including 

monitoring by APHIS inspectors and 

safeguarding of the fruit. Treatment 

could be conducted at an approved 

facility in Australia or in the United 

States. 

The required irradiation treatment 

would not mitigate the risks posed by 

the fungus C. mangiferae. In order to 

mitigate the risks posed by C. 

mangiferae, which we consider to be of 

medium risk of introduction and 

dissemination within the continental 

United States, we are proposing three 

options: (1) The mangoes be treated 

with a broad-spectrum post-harvest 

fungicidal dip, (2) the mangoes originate 

from an orchard that was inspected 

prior to the beginning of harvest during 

the growing season and the orchard was 

found free of C. mangiferae, or (3) the 

mangoes originate from an orchard that 

was treated with a broad-spectrum 

fungicide during the growing season 

and was inspected prior to harvest and 

the fruit was found free of C. 

mangiferae. 

Symptoms of C. mangiferae can be 

easily seen and detected in the field on 

mango leaves and fruit during preharvest inspection. Post-harvest diseases 

do not occur without the presence of 

fungal symptoms on leaves in the field. 

Orchard application of broad-spectrum 

fungicide sprays protects fruit from 

infection by aerial spores produced on 

leaves or stems. In Australia, spraying of 

mango plants with broad-spectrum 

fungicides during the growing season is 

a common practice to control fungal 

diseases. 

Prior to export from Australia, the 

fruit would have to be inspected by the 

NPPO of Australia and found free of C. 

mangiferae, L. pseudotheobraomae, N. 

mangiferae, N. novaehollandiae, P. 

adansoniae, P. mangiferae, Fusarium 

spp., and X. campestris pv. 

mangiferaeindicae. Symptoms of these 

pathogens are easily discernible with 

the naked eye and would most likely be 

detected during visual inspection of the 

fruit at the packinghouse. These 

practices would effectively remove 

these pathogens of concern from the 

pathway. 

Each consignment of fruit would have 

to be accompanied by a phytosanitary 

certificate (PC) issued by the NPPO of 

Australia with additional declarations 

that would confirm that: (1) The 

mangoes were subjected to one of the 

pre- and post-harvest mitigation options 

for C. mangiferae described earlier and 

(2) the mangoes were inspected prior to 

export and found free of C. mangiferae, 

L. pseudotheobraomae, N. mangiferae, 

N. novaehollandiae, P. adansoniae, P. 

mangiferae, Fusarium spp., and X. 

campestris pv. mangiferaeindicae. 

In addition, if the fruit is treated with 

irradiation outside the United States, 

each consignment of fruit would have to 

be inspected jointly by APHIS and the 

NPPO of Australia, and the PC would 

have to include an additional 

declaration that the fruit received the 

irradiation treatment. 

Mangoes imported from Australia into 

the United States would also be subject 

to inspection at the port of entry. 

Executive Order 12866 and Regulatory 

Flexibility Act 

This proposed rule has been 

determined to be not significant for the 

purposes of Executive Order 12866 and, 

therefore, has been reviewed by the 

Office of Management and Budget. 

We have prepared an economic 

analysis for this rule. The economic 

analysis provides a cost-benefit analysis, 

as required by Executive Order 12866, 

and an analysis of the potential 

economic effects of this action on small 

entities, as required by the Regulatory 

Flexibility Act. The economic analysis 

is summarized below. Copies of the full 

analysis are available by contacting the 

person listed under FOR FURTHER

INFORMATION CONTACT or on the 

Regulations.gov Web site (see 

ADDRESSES above for instructions for 

accessing Regulations.gov). 

The United States produces 

approximately 3,000 metric tons of 

mangoes per year, about one-hundredth 

of 1 percent of world production. While 

U.S. mango production is limited, the 

United States is the world’s leading 

importer of fresh mangoes, receiving 33 

percent of imports worldwide. 

Currently, Australia produces 60,000 

metric tons of mangoes during the midSeptember to mid-April season. Mango 

imports from Australia are expected to 

total about 1,200 metric tons per year. 

This represents approximately 0.5 

percent of total U.S. mango imports. 

U.S. consumers will benefit from 

increased access to another variety of 

fresh mangoes. In addition, because the 

Australian mango season is opposite 

that of the United States, fresh mango 

imports would not compete with 

domestic production and U.S. 

consumers can have access to mangoes 

the entire year. 

Under these circumstances, the 

Administrator of the Animal and Plant 

Health Inspection Service has 

determined that this action would not 

have a significant economic impact on 

a substantial number of small entities. 

Executive Order 12988 

This proposed rule would allow 

mangoes to be imported into the United 

States from Australia. If this proposed 


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65990 Federal Register / Vol. 76, No. 206 / Tuesday, October 25, 2011 / Proposed Rules 

rule is adopted, State and local laws and 

regulations regarding mangoes imported 

under this rule would be preempted 

while the fruit is in foreign commerce. 

Fresh fruits are generally imported for 

immediate distribution and sale to the 

consuming public and would remain in 

foreign commerce until sold to the 

ultimate consumer. The question of 

when foreign commerce ceases in other 

cases must be addressed on a case-bycase basis. If this proposed rule is 

adopted, no retroactive effect will be 

given to this rule, and this rule will not 

require administrative proceedings 

before parties may file suit in court 

challenging this rule. 

Paperwork Reduction Act 

In accordance with section 3507(d) of 

the Paperwork Reduction Act of 1995 

(44 U.S.C. 3501 et seq.), the information 

collection or recordkeeping 

requirements included in this proposed 

rule have been submitted for approval to 

the Office of Management and Budget 

(OMB). Please send written comments 

to the Office of Information and 

Regulatory Affairs, OMB, Attention: 

Desk Officer for APHIS, Washington, DC 

20503. Please state that your comments 

refer to Docket No. APHIS–2011–0040. 

Please send a copy of your comments to: 

(1) Docket No. APHIS–2011–0040, 

Regulatory Analysis and Development, 

PPD, APHIS, Station 3A–03.8, 4700 

River Road, Unit 118, Riverdale, MD 

20737–1238, and (2) Clearance Officer, 

OCIO, USDA, Room 404–W, 14th Street 

and Independence Avenue, SW., 

Washington, DC 20250. A comment to 

OMB is best assured of having its full 

effect if OMB receives it within 30 days 

of publication of this proposed rule. 

APHIS is proposing to amend the 

fruits and vegetables regulations to 

allow, under certain conditions, the 

importation into the United States of 

commercial consignments of fresh 

mangoes from Australia. The conditions 

for the importation of fresh mangoes 

from Australia include requirements for 

pest exclusion at the production site, 

irradiation treatment, pest-excluding 

packinghouse procedures and port-ofentry inspections. The mangoes would 

also be required to be accompanied by 

a phytosanitary certificate issued by the 

national plant protection organization 

(NPPO) of Australia with an additional 

declaration confirming that the mangoes 

had been produced in accordance with 

the proposed requirements. This action 

would allow for the importation of fresh 

mangoes from Australia while 

continuing to provide protection against 

the introduction of injurious plant pests 

into the United States. 

We are soliciting comments from the 

public (as well as affected agencies) 

concerning our proposed information 

collection and recordkeeping 

requirements. These comments will 

help us: 

(1) Evaluate whether the proposed 

information collection is necessary for 

the proper performance of our agency s 

functions, including whether the 

information will have practical utility; 

(2) Evaluate the accuracy of our 

estimate of the burden of the proposed 

information collection, including the 

validity of the methodology and 

assumptions used; 

(3) Enhance the quality, utility, and 

clarity of the information to be 

collected; and 

(4) Minimize the burden of the 

information collection on those who are 

to respond (such as through the use of 

appropriate automated, electronic, 

mechanical, or other technological 

collection techniques or other forms of 

information technology; e.g., permitting 

electronic submission of responses). 

Estimate of burden: Public reporting 

burden for this collection of information 

is estimated to average 0.5 hours per 

response. 

Respondents: Foreign business. 

Estimated annual number of 

respondents: 20. 

Estimated annual number of 

responses per respondent: 5. 

Estimated annual number of 

responses: 100. 

Estimated total annual burden on 

respondents: 50 hours. (Due to 

averaging, the total annual burden hours 

may not equal the product of the annual 

number of responses multiplied by the 

reporting burden per response.) 

Copies of this information collection 

can be obtained from Mrs. Celeste 

Sickles, APHIS’ Information Collection 

Coordinator, at (301) 851–2908. 

E-Government Act Compliance 

The Animal and Plant Health 

Inspection Service is committed to 

compliance with the E-Government Act 

to promote the use of the Internet and 

other information technologies, to 

provide increased opportunities for 

citizen access to Government 

information and services, and for other 

purposes. For information pertinent to 

E-Government Act compliance related 

to this proposed rule, please contact 

Mrs. Celeste Sickles, APHIS’ 

Information Collection Coordinator, at 

(301) 851–2908. 

List of Subjects in 7 CFR Part 319 

Coffee, Cotton, Fruits, Imports, Logs, 

Nursery stock, Plant diseases and pests, 

Quarantine, Reporting and 

recordkeeping requirements, Rice, 

Vegetables. 

Accordingly, we propose to amend 7 

CFR part 319 as follows: 

PART 319—FOREIGN QUARANTINE 

NOTICES 

1. The authority citation for part 319 

continues to read as follows: 

Authority: 7 U.S.C. 450, 7701–7772, and 

7781–7786; 21 U.S.C. 136 and 136a; 7 CFR 

2.22, 2.80, and 371.3. 

2. A new § 319.56–54 is added to read 

as follows: 

§ 319.56–54 Mangoes from Australia. 

Mangoes (Mangifera indica) may be 

imported into the continental United 

States from Australia only under the 

following conditions: 

(a) The mangoes may be imported in 

commercial consignments only. 

(b) The mangoes must be treated by 

irradiation for plant pests of the class 

Insecta, except pupae and adults of the 

order Lepidoptera, in accordance with 

part 305 of this chapter. 

(c) The risks presented by 

Cytosphaera mangiferae must be 

addressed in one of the following ways: 

(1) The mangoes are treated with a 

broad-spectrum post-harvest fungicidal 

dip; 

(2) The mangoes originate from an 

orchard that was inspected prior to the 

beginning of harvest during the growing 

season and the orchard was found free 

of C. mangiferae; or 

(3) The mangoes originate from an 

orchard that were treated with a broadspectrum fungicide during the growing 

season and was inspected prior to 

harvest and the mangoes are found free 

of C. mangiferae. 

(d) Prior to export from Australia, the 

mangoes must be inspected by the 

national plant protection organization 

(NPPO) of Australia and found free of C. 

mangiferae, L. pseudotheobraomae, N. 

mangiferae, N. novaehollandiae, P. 

adansoniae, P. mangiferae, Fusarium 

spp. complex associated with mango 

malformation disease, and X. campestris 

pv. mangiferaeindicae. 

(e) (1) Each consignment of fruit must 

be accompanied by a phytosanitary 

certificate issued by the NPPO of 

Australia with additional declarations 

that: 

(i) The mangoes were subjected to one 

of the pre- or post-harvest mitigation 

options described in § 319.56–54(c), and 

(ii) The mangoes were inspected prior 

to export from Australia and found free 

of C. mangiferae, L. 

pseudotheobraomae, N. mangiferae, N. 

novaehollandiae, P. adansoniae, P. 

mangiferae, Fusarium spp. complex 


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associated with mango malformation 

disease, and X. campestris pv. 

mangiferaeindicae. 

(2) If the fruit is treated with 

irradiation outside the United States, 

each consignment of fruit must be 

inspected jointly by APHIS and the 

NPPO of Australia, and the 

phytosanitary certificate must include 

an additional declaration that the fruit 

was treated with irradiation in 

accordance with part 305 of this 

chapter. 

Done in Washington, DC this 19th day of 

October 2011. 

Kevin Shea, 

Acting Administrator, Animal and Plant 

Health Inspection Service. 

[FR Doc. 2011–27564 Filed 10–24–11; 8:45 am] 

BILLING CODE 3410–34–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1093; Directorate 

Identifier 2010–NM–149–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for the 

products listed above. This proposed 

AD would require repetitive detailed 

inspections for discrepancies of the 

horizontal stabilizer ballscrew assembly; 

repetitive lubrication of the horizontal 

stabilizer trim control system; repetitive 

measurements for discrepancies of the 

ballscrew to ballnut freeplay; and 

corrective actions if necessary. This 

proposed AD was prompted by a report 

of extensive corrosion of the ballscrew 

of the drive mechanism of the 

horizontal stabilizer trim actuator. We 

are proposing this AD to prevent 

undetected failure of the primary and 

secondary load paths for the ballscrew 

in the horizontal stabilizer, which could 

lead to loss of control of the horizontal 

stabilizer and consequent loss of control 

of the airplane. 

DATES: We must receive comments on 

this proposed AD by December 9, 2011. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue, SE., Washington, DC 20590. 

• Hand Delivery: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue, SE., Washington, DC 20590, 

between 9 a.m. and 5 p.m., Monday 

through Friday, except Federal holidays. 

For service information identified in 

this proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; 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 proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket 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: 

Kelly McGuckin, Aerospace Engineer, 

Systems and Equipment Branch, ANM– 

130S, FAA, Seattle Airplane 

Certification Office, 1601 Lind Avenue, 

SW., Renton, Washington 98057–3356; 

telephone (425) 917–6490; fax (425) 

917–6590. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2011–1093; Directorate Identifier 

2010–NM–149–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

We received a report of extensive 

corrosion of the ballscrew of the drive 

mechanism of the horizontal stabilizer 

trim actuator (HSTA). Boeing previously 

initiated a design review and safety 

analysis of the ballscrews used on all 

Model 757 airplanes as a result of an 

MD–80 airplane accident which 

occurred in January 2000. The cause of 

that accident was attributed to an inflight failure of the horizontal stabilizer 

jackscrew assembly caused by 

inadequate maintenance. Jackscrews 

and ballscrews are similar in function 

and have similar airplane level failure 

modes. During this review a Model 757 

airplane operator reported the subject 

corrosion. This condition, if not 

corrected, could result in undetected 

failure of the primary and secondary 

load paths for the ballscrew in the 

horizontal stabilizer, which could lead 

to loss of control of the horizontal 

stabilizer and consequent loss of control 

of the airplane. 

Relevant Service Information 

We have reviewed Boeing Alert 

Service Bulletins 757–27A0144 (for 

Model 757–200, –200CB, and 200PF 

series airplanes) and 757–27A0145 (for 

Model 757–300 series airplanes), both 

Revision 1, both dated January 20, 2010. 

These service bulletins describe 

procedures for repetitive detailed 

inspections for discrepancies of the 

horizontal stabilizer ballscrew assembly 

(including but not limited to, damage, 

cracking, corrosion, or wear); repetitive 

lubrication of the horizontal stabilizer 

trim control system; and repetitive 

measurements of the ballscrew to 

ballnut freeplay for discrepancies. 

We have also reviewed Subject 27– 

41–10, ‘‘Stabilizer Trim Ballscrew 

Freeplay,’’ of Chapter 27, ‘‘Flight 

Controls,’’ of the Boeing 757 Airplane 

Maintenance Manual (AMM), Revision 

101, dated May 20, 2011, which 

describes procedures for accomplishing 

the subject inspections and freeplay 

measurements, and applicable 

corrective actions. 


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