10444 Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations 

method, modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(k) Related Information 

(1) For more information about this AD, 

contact Michael Bumbaugh, Aerospace 

Engineer, Airframe Section, FAA, Seattle 

ACO Branch, 2200 South 216th St., Des 

Moines, WA 98198; phone and fax: 206–231– 

3522; email: michael.bumbaugh@faa.gov. 

(2) Service information identified in this 

AD that is not incorporated by reference is 

available at the addresses specified in 

paragraphs (l)(3) and (4) of this AD. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

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

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

737–52A1180 RB, dated January 24, 2020. 

(ii) [Reserved] 

(3) For service information identified in 

this AD, 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. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

St., Des Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(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, 

email fedreg.legal@nara.gov, or go to: https:// 

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

Issued on December 28, 2020. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–01851 Filed 2–19–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–1109; Product 

Identifier 2020–NM–067–AD; Amendment 

39–21383; AD 2021–01–07] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 737–700 

series airplanes. This AD requires 

repetitive testing to verify correct 

operation of the smoke clearance mode 

of the equipment cooling system and 

low pressure environmental control 

system, and corrective actions if 

necessary. This AD also requires 

installing new relays and changing the 

wiring to the environmental control 

system, among other actions. This AD 

was prompted by a determination that a 

repetitive test is needed to assess the 

components on airplanes equipped with 

a certain air distribution system 

configuration. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective March 9, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of March 9, 2021. 

The FAA must receive comments on 

this AD by April 8, 2021. 

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 

https://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 final rule, 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 service information at the FAA, 

Airworthiness Products Section, 

Operational Safety 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 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–1109. 

Examining the AD Docket 

You may examine the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2020– 

1109; or in person at Docket Operations 

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

through Friday, except Federal holidays. 

The AD docket contains this final rule, 

any comments received, and other 

information. The street address for 

Docket Operations is listed above. 

Comments will be available in the AD 

docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Susan L. Monroe, Aerospace Engineer, 

Cabin Safety and Environmental 

Systems Section, FAA, Seattle ACO 

Branch, 2200 South 216th St., Des 

Moines, WA 98198; phone and fax: 206– 

231–3570; email: susan.l.monroe@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The FAA has determined that a 

repetitive test is needed to assess the 

components on airplanes equipped with 

a certain air distribution system 

configuration. A review by Boeing 

found that there was no maintenance 

procedure available to assess the 

components used to reconfigure the air 

distribution system to the cargo fire 

mode. Without the repetitive test, 

failures of components could be latent 

for extended periods. This condition, if 

not addressed, could result in latent 

failures of the equipment cooling system 

and low pressure environmental control 

system, which, in combination with a 

cargo fire event, could result in smoke 

in the flight deck and/or main cabin, 

and possible loss of aircraft control. 

Other Related Rulemaking 

The FAA issued AD 2016–04–06, 

Amendment 39–18400 (81 FR 9756, 

February 26, 2016) (AD 2016–04–06), 

applicable to all The Boeing Company 

Model 737–600, –700, –700C, –800, 

–900, and –900ER series airplanes. That 

AD requires doing repetitive testing to 

verify correct operation of the 

equipment cooling system and low 

pressure environmental control system, 

and corrective actions if necessary. That 

AD also requires, for certain airplanes, 

installing new relays and changing the 

wiring to the environmental control 

system. That AD was prompted by a 

determination that a repetitive test is 

needed to inspect the components on 

airplanes equipped with a certain air 

distribution system configuration. The 

actions required by that AD are 

intended to address latent failures of the 

equipment cooling system and low 


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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations 10445 

pressure environmental control system, 

which, in combination with a cargo fire 

event, could result in smoke in the flight 

deck and/or main cabin, and possible 

loss of aircraft control. 

Since issuance of that AD, the FAA 

has determined that additional actions 

are necessary to address the same unsafe 

condition identified in AD 2016–04–06 

for The Boeing Company Model 737– 

700 series airplanes having line 

numbers (L/Ns) 481, 545, 684, 979, 

1089, 1211, and 1223. Those actions 

have been included in the revised 

service information specified in 

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

AD adds the requirements of paragraph 

(h) that include installing new relays 

and changing the wiring to the 

environmental control system, and 

accomplishing certain concurrent 

actions, for the affected airplanes. 

Relationship Between This AD and AD 

2016–04–06 

This AD does not supersede AD 

2016–04–06. Rather, the FAA has 

determined that a stand-alone AD 

would be more appropriate to address 

the requirements of this AD. AD 2016– 

04–06 did not address the unsafe 

condition for the 7 airplanes mentioned 

previously and identified in paragraph 

(c) of this AD. To address the unsafe 

condition for these 7 airplanes, this AD 

requires repetitive testing to verify 

correct operation of the smoke clearance 

mode of the equipment cooling system 

and low pressure environmental control 

system, and corrective actions if 

necessary; and also requires installing 

new relays and changing the wiring to 

the environmental control system, and 

accomplishing certain concurrent 

actions. As such, this AD terminates all 

of the requirements of AD 2016–04–06 

for the airplanes identified in paragraph 

(c) of this AD only. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed the following 

service information: 

Boeing Alert Service Bulletin 737– 

26A1122, Revision 3, dated January 31, 

2020. This service information describes 

procedures for installing new relays and 

changing the wiring to the 

environmental control system. 

Boeing Alert Service Bulletin 737– 

26A1137, Revision 2, dated January 27, 

2020. This service information describes 

procedures for repetitive testing to 

verify correct operation of the smoke 

clearance mode of the equipment 

cooling system and low pressure 

environmental control system, and 

applicable corrective actions. 

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 

The FAA is issuing this AD because 

the agency 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. 

AD Requirements 

This AD requires accomplishing the 

actions specified in the service 

information described previously. 

FAA’s Justification and Determination 

of the Effective Date 

There are currently no domestic 

operators of these products. Therefore, 

the FAA finds that notice and 

opportunity for prior public comment 

are unnecessary and that good cause 

exists for making this amendment 

effective in less than 30 days. 

Comments Invited 

This AD is a final rule that involves 

requirements affecting flight safety and 

was not preceded by notice and an 

opportunity for public comment. 

However, the FAA invites you to send 

any written data, views, or arguments 

about this final rule. Send your 

comments to an address listed under the 

ADDRESSES section. Include Docket No. 

FAA–2020–1109 and Product Identifier 

2020–NM–067–AD at the beginning of 

your comments. The FAA specifically 

invites comments on the overall 

regulatory, economic, environmental, 

and energy aspects of this final rule. The 

FAA will consider all comments 

received by the closing date and may 

amend this final rule because of those 

comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, as well as a 

report summarizing each substantive 

public contact with FAA personnel 

concerning this AD. The FAA will 

consider all comments received by the 

closing date for comments. The FAA 

may amend this AD because of those 

comments. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this AD contain 

commercial or financial information 

that is customarily treated as private, 

that you actually treat as private, and 

that is relevant or responsive to this AD, 

it is important that you clearly designate 

the submitted comments as CBI. Please 

mark each page of your submission 

containing CBI as ‘‘PROPIN.’’ The FAA 

will treat such marked submissions as 

confidential under the FOIA, and they 

will not be placed in the public docket 

of this AD. Submissions containing CBI 

should be sent to Susan L. Monroe, 

Aerospace Engineer, Cabin Safety and 

Environmental Systems Section, FAA, 

Seattle ACO Branch, 2200 South 216th 

St., Des Moines, WA 98198; phone and 

fax: 206–231–3570; email: 

susan.l.monroe@faa.gov. Any 

commentary that the FAA receives that 

is not specifically designated as CBI will 

be placed in the public docket for this 

rulemaking. 

Regulatory Flexibility Act (RFA) 

The requirements of the RFA do not 

apply when an agency finds good cause 

pursuant to 5 U.S.C. 553 to adopt a rule 

without prior notice and comment. 

Because the FAA has determined that it 

has good cause to adopt this rule 

without notice and comment, RFA 

analysis is not required. 

Costs of Compliance 

Currently, there are no affected U.S.- 

registered airplanes. For any affected 

airplane that is imported and placed on 

the U.S. Register in the future, the FAA 

provides the following cost estimates to 

comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per product 

Operational Test ....................................... 4 work-hours × $85 per hour = $340 per test cycle ............ $0 $340 per test cycle. 

New relays/wiring changes ....................... 104 work hours × $85 per hour = $8,840 ............................ 11,417 $20,257. 


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10446 Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations 

We estimate the following costs to do 

any necessary system fault isolation and 

replacements that would be required 

based on the results of the operational 

test. We have no way of determining the 

number of aircraft that might need these 

actions: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Perform system fault isolation and replace faulty component .... 10 work-hours × $85 per hour = $850 .......... $0 $850 

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. 

The FAA is 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, 

and 

(2) Will not affect intrastate aviation 

in Alaska. 

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: 

2021–01–07 The Boeing Company: 

Amendment 39–21383; Docket No. 

FAA–2020–1109; Product Identifier 

2020–NM–067–AD. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 9, 2021. 

(b) Affected ADs 

This AD affects AD 2016–04–06, 

Amendment 39–18400 (81 FR 9756, February 

26, 2016) (‘‘AD 2016–04–06’’). 

(c) Applicability 

This AD applies to The Boeing Company 

Model 737–700 airplanes, certificated in any 

category, having line numbers (L/Ns) 481, 

545, 684, 979, 1089, 1211, and 1223. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 2120, Air Distribution System. 

(e) Unsafe Condition 

This AD was prompted by a determination 

that a repetitive test is needed to assess the 

components on airplanes equipped with a 

certain air distribution system configuration. 

The FAA is issuing this AD to address latent 

failures of the equipment cooling system and 

low pressure environmental control system, 

which, in combination with a cargo fire 

event, could result in smoke in the flight 

deck and/or main cabin, and possible loss of 

aircraft control. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Repetitive Operational Tests and 

Corrective Actions 

At the applicable times identified in 

paragraph 1.E., ‘‘Compliance’’ of Boeing Alert 

Service Bulletin 737–26A1137, Revision 2, 

dated January 27, 2020, except as required by 

paragraph (i) of this AD, do the test to verify 

correct operation of the smoke clearance 

mode of the equipment cooling system and 

low pressure environmental control system, 

and do all applicable corrective actions, in 

accordance with the Accomplishment 

Instructions of Boeing Alert Service Bulletin 

737–26A1137, Revision 2, dated January 27, 

2020. Do all applicable corrective actions 

before further flight. Repeat the test thereafter 

at intervals not to exceed 9,000 flight hours. 

(h) Concurrent Requirements 

Before or concurrently with accomplishing 

the initial operational test required by 

paragraph (g) of this AD, install new relays 

and change the wiring to the environmental 

control system, in accordance with the 

Accomplishment Instructions of Boeing Alert 

Service Bulletin 737–26A1122, Revision 3, 

dated January 31, 2020. When the actions 

required by this paragraph are performed, the 

installation and changes specified in 

paragraph 1.B. ‘‘Concurrent Requirements’’ of 

Boeing Alert Service Bulletin 737–26A1122, 

Revision 3, dated January 31, 2020, must also 

be done. 

(i) Exceptions to Service Information 

Specifications 

Where Boeing Alert Service Bulletin 737– 

26A1137, Revision 2, dated January 27, 2020, 

uses the phrase ‘‘the R02 issue date of SB 

737–26A1137,’’ this AD requires using ‘‘the 

effective date of this AD.’’ 

(j) Terminating Action for AD 2016–04–06 

As of the effective date of this AD, for the 

airplanes identified in paragraph (c) of this 

AD only, the requirements of AD 2016–04– 

06 are terminated. 

(k) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle 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 the attention of 

the person identified in paragraph (l) of this 

AD. Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 


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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations 10447 

Manager, Seattle ACO Branch, FAA, to make 

those findings. To be approved, the repair 

method, modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(4) For service information that contains 

steps that are labeled as Required for 

Compliance (RC), the provisions of 

paragraphs (k)(4)(i) and (ii) of this AD apply. 

(i) The steps labeled as RC, including 

substeps under an RC step and any figures 

identified in an RC step, must be done to 

comply with the AD. If a step or substep is 

labeled ‘‘RC Exempt,’’ then the RC 

requirement is removed from that step or 

substep. An AMOC is required for any 

deviations to RC steps, including substeps 

and identified figures. 

(ii) Steps not labeled as RC may be 

deviated from using accepted methods in 

accordance with the operator’s maintenance 

or inspection program without obtaining 

approval of an AMOC, provided the RC steps, 

including substeps and identified figures, can 

still be done as specified, and the airplane 

can be put back in an airworthy condition. 

(l) Related Information 

For more information about this AD, 

contact Susan L. Monroe, Aerospace 

Engineer, Cabin Safety and Environmental 

Systems Section, FAA, Seattle ACO Branch, 

2200 South 216th St., Des Moines, WA 

98198; phone and fax: 206–231–3570; email: 

susan.l.monroe@faa.gov. 

(m) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

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

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Boeing Alert Service Bulletin 737– 

26A1122, Revision 3, dated January 31, 2020. 

(ii) Boeing Alert Service Bulletin 737– 

26A1137, Revision 2, dated January 27, 2020. 

(3) For service information identified in 

this AD, 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. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

St., Des Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(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, 

email fedreg.legal@nara.gov, or go to: https:// 

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

Issued on December 30, 2020. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–01823 Filed 2–19–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0855; Project 

Identifier MCAI–2020–00909–T; Amendment 

39–21385; AD 2021–02–02] 

RIN 2120–AA64 

Airworthiness Directives; Saab AB, 

Support and Services (Formerly 

Known as Saab AB, Saab Aeronautics) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all Saab 

AB, Support and Services Model SAAB 

2000 airplanes. This AD was prompted 

by a report of inadvertently reversed 

connections of the outboard and inboard 

channel harnesses of the wheel speed 

transducers in the main landing gear 

(MLG) wheel axles. This AD requires an 

inspection for correct installation of the 

MLG anti-skid system harnesses and 

corrective actions if necessary, as 

specified in a European Union Aviation 

Safety Agency (EASA) AD, which is 

incorporated by reference. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective March 29, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of March 29, 2021. 

ADDRESSES: For material incorporated 

by reference (IBR) in this AD, contact 

the EASA, Konrad-Adenauer-Ufer 3, 

50668 Cologne, Germany; phone: +49 

221 8999 000; email: ADs@

easa.europa.eu; internet: 

www.easa.europa.eu. You may find this 

IBR material on the EASA website at 

https://ad.easa.europa.eu. You may 

view this IBR material at the FAA, 

Airworthiness Products Section, 

Operational Safety 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 in the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2020– 

0855. 

Examining the AD Docket 

You may examine the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2020– 

0855; or in person at Docket Operations 

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

through Friday, except Federal holidays. 

The AD docket contains this final rule, 

any comments received, and other 

information. The address for Docket 

Operations is 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: 

Shahram Daneshmandi, Aerospace 

Engineer, Large Aircraft Section, 

International Validation Branch, FAA, 

2200 South 216th St., Des Moines, WA 

98198; phone and fax: 206–231–3220; 

email: shahram.daneshmandi@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The EASA, which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA AD 

2020–0137, dated June 18, 2020 (EASA 

AD 2020–0137) (referred to after this as 

the Mandatory Continuing 

Airworthiness Information, or the 

MCAI), to correct an unsafe condition 

for all Saab AB, Support and Services 

Model SAAB 2000 airplanes. 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to all Saab AB, Support and 

Services Model SAAB 2000 airplanes. 

The NPRM published in the Federal 

Register on October 1, 2020 (85 FR 

61877). The NPRM was prompted by a 

report of inadvertently reversed 

connections of the outboard and inboard 

channel harnesses of the wheel speed 

transducers in the MLG wheel axles. 

The NPRM proposed to require an 

inspection for correct installation of the 

MLG anti-skid system harnesses and 

corrective actions if necessary, as 

specified in an EASA AD. 

The FAA is issuing this AD to address 

inadvertently reversed connections of 

the outboard and inboard channel 

harnesses of the wheel speed 

transducers in the MLG wheel axles, 

which could lead to wrong inputs to the 

anti-skid function, whenever activated, 

with consequent reduced braking 

capability, and possibly result in 

damage to the airplane and loss of 

control during landing. See the MCAI 

for additional background information. 


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