This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

25785 

Vol. 75, No. 89 

Monday, May 10, 2010 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0474; Directorate 

Identifier 2009–NM–056–AD] 

RIN 2120–AA64 

Airworthiness Directives; BAE 

Systems (Operations) Limited Model 

4101 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 that would 

supersede an existing AD. This 

proposed AD results from mandatory 

continuing airworthiness information 

(MCAI) originated by an aviation 

authority of another country to identify 

and correct an unsafe condition on an 

aviation product. The MCAI describes 

the unsafe condition as: During ground 

maneuvering, prolonged operation with 

either engine in the restricted range 

between 82% and 90% RPM 

[revolutions per minute] will result in 

damage [e.g., cracking of the blade or 

hub] to the propeller assembly that 

could eventually result in the release of 

a propeller blade. EASA AD 2007–0268 

[which corresponds to FAA AD 2008– 

13–02] was issued to require the 

installation of a Propeller Warning 

Placard and implementation of a 

corresponding Aircraft Flight Manual 

(AFM) limitation instructing the flight 

crew to taxi with the condition lever at 

FLIGHT in order to minimise the time 

spent by the engines in the restricted 

range. BAE Systems has now developed 

a Propeller Speed Warning System. 

A released propeller blade could 

result in engine failure and loss of 

control of the airplane. The proposed 

AD would require actions that are 

intended to address the unsafe 

condition described in the MCAI. 

DATES: We must receive comments on 

this proposed AD by June 24, 2010. 

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 

W12–40, 1200 New Jersey Avenue, SE., 

Washington, DC, between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact BAE Systems 

Regional Aircraft, 13850 McLearen 

Road, Herndon, Virginia 20171; 

telephone 703–736–1080; e-mail 

raebusiness@baesystems.com; Internet 

http://www.baesystems.com/Businesses/ 

RegionalAircraft/index.htm. 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 Operations office 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 Operations 

office (telephone (800) 647–5527) is in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Todd Thompson, Aerospace Engineer, 

International Branch, ANM–116, 

Transport Airplane Directorate, FAA, 

1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 227–1175; fax (425) 227–1149. 

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–2010–0474; Directorate Identifier 

2009–NM–056–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 based on those comments. 

We have lengthened the 30-day 

comment period for proposed ADs that 

address MCAI originated by aviation 

authorities of other countries to provide 

adequate time for interested parties to 

submit comments. The comment period 

for these proposed ADs is now typically 

45 days, which is consistent with the 

comment period for domestic transport 

ADs. 

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 

On June 10, 2008, we issued AD 

2008–13–02, Amendment 39–15565 (73 

FR 34847, June 19, 2008). That AD 

requires actions intended to address an 

unsafe condition on the products listed 

above. 

Since we issued AD 2008–13–02, 

inadvertent high revolutions per minute 

(RPM) taxiing operations have been 

reported to have caused stress to the 

propeller blades, which can result in 

dangerous blade cracks. The European 

Aviation Safety Agency (EASA), which 

is the Technical Agent for the Member 

States of the European Community, has 

issued EASA Airworthiness Directive 

2009–0038, dated February 18, 2009 

(referred to after this as ‘‘the MCAI’’), to 

correct an unsafe condition for the 

specified products. The MCAI states: 

During ground manoeuvring, prolonged 

operation with either engine in the restricted 

range between 82% and 90% RPM 

[revolutions per minute] will result in 

damage [e.g., cracking of the blade or hub] to 

the propeller assembly that could eventually 

result in the release of a propeller blade. 

To correct this unsafe condition, EASA AD 

2007–0268 [which corresponds to FAA AD 

2008–13–02] was issued to require the 

installation of a Propeller Warning Placard 

and implementation of a corresponding 

mstockstill on DSKH9S0YB1PROD with PROPOSALS

25786 Federal Register / Vol. 75, No. 89 / Monday, May 10, 2010 / Proposed Rules 

Aircraft Flight Manual (AFM) limitation, 

instructing the flight crew to taxi with the 

condition lever at FLIGHT in order to 

minimize the time spent by the engines in 

the restricted range. BAE Systems has now 

developed a Propeller Speed Warning 

System, embodiment of which will allow 

taxiing with the condition lever at TAXI, 

through the introduction of a revised Flight 

Manual Limitation. 

For the reasons described above, this EASA 

AD retains the requirements of EASA AD 

2007–0268, which is superseded, and 

requires the installation of a Propeller Speed 

Warning System. 

A released propeller blade could result 

in engine failure and loss of control of 

the airplane. You may obtain further 

information by examining the MCAI in 

the AD docket. 

Relevant Service Information 

BAE Systems (Operations) Limited 

has issued Aircraft Change Information 

Bulletin J41–61–014, Section 2, Issue 7, 

dated August 17, 2009. The actions 

described in this service information are 

intended to correct the unsafe condition 

identified in the MCAI. 

FAA’s Determination and Requirements 

of This Proposed AD 

This product has been approved by 

the aviation authority of another 

country, and is approved for operation 

in the United States. Pursuant to our 

bilateral agreement with the State of 

Design Authority, we have been notified 

of the unsafe condition described in the 

MCAI and service information 

referenced above. We are proposing this 

AD because we evaluated all pertinent 

information and determined an unsafe 

condition exists and is likely to exist or 

develop on other products of the same 

type design. 

Differences Between This AD and the 

MCAI or Service Information 

We have reviewed the MCAI and 

related service information and, in 

general, agree with their substance. But 

we might have found it necessary to use 

different words from those in the MCAI 

to ensure the AD is clear for U.S. 

operators and is enforceable. In making 

these changes, we do not intend to differ 

substantively from the information 

provided in the MCAI and related 

service information. 

We might also have proposed 

different actions in this AD from those 

in the MCAI in order to follow FAA 

policies. Any such differences are 

highlighted in a NOTE within the 

proposed AD. 

Costs of Compliance 

Based on the service information, we 

estimate that this proposed AD would 

affect about 3 products of U.S. registry. 

The actions that are required by AD 

2008–13–02 and retained in this 

proposed AD take about 2 work-hours 

per product, at an average labor rate of 

$85 per work hour. Required parts cost 

about $25 per product. Based on these 

figures, the estimated cost of the 

currently required actions is $195 per 

product. 

We estimate that it would take about 

20 work-hours per product to comply 

with the new basic requirements of this 

proposed AD. The average labor rate is 

$85 per work-hour. Required parts 

would cost about $2,800 per product. 

Where the service information lists 

required parts costs that are covered 

under warranty, we have assumed that 

there will be no charge for these costs. 

As we do not control warranty coverage 

for affected parties, some parties may 

incur costs higher than estimated here. 

Based on these figures, we estimate the 

cost of the proposed AD on U.S. 

operators to be $14,085, or $4,695 per 

product. 

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 

We determined that this proposed AD 

would not have federalism implications 

under Executive Order 13132. This 

proposed AD would not have a 

substantial direct effect on the States, on 

the relationship between the national 

Government and the States, or on the 

distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify this proposed regulation: 

1. Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866; 

2. Is not a ‘‘significant rule’’ under the 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979); and 

3. 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD and placed it in the 

AD docket. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

2. The FAA amends § 39.13 by 

removing Amendment 39–15565 (73 FR 

34847, June 19, 2008) and adding the 

following new AD: 

BAE Systems (Operations) Limited: Docket 

No. FAA–2010–0474; Directorate 

Identifier 2009–NM–056–AD. 

Comments Due Date 

(a) We must receive comments by June 24, 

2010. 

Affected ADs 

(b) The proposed AD supersedes AD 2008– 

13–02, Amendment 39–15565. 

Applicability 

(c) This AD applies to all BAE Systems 

(Operations) Limited Model 4101 airplanes, 

certificated in any category. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 61: Propellers/Propulsors. 

Reason 

(e) The mandatory continuing 

airworthiness information (MCAI) states: 

During ground maneuvreing, prolonged 

operation with either engine in the restricted 

range between 82% and 90% RPM 

[revolutions per minute] will result in 

damage [e.g., cracking of the blade or hub] to 

the propeller assembly that could eventually 

result in the release of a propeller blade. 

To correct this unsafe condition, EASA AD 

2007–0268 [which corresponds to FAA AD 

2008–13–02] was issued to require the 

installation of a Propeller Warning Placard 

mstockstill on DSKH9S0YB1PROD with PROPOSALS

Federal Register / Vol. 75, No. 89 / Monday, May 10, 2010 / Proposed Rules 25787 

and implementation of a corresponding 

Aircraft Flight Manual (AFM) limitation, 

instructing the flight crew to taxi with the 

condition lever at FLIGHT in order to 

minimize the time spent by the engines in 

the restricted range. BAE Systems has now 

developed a Propeller Speed Warning 

System, embodiment of which will allow 

taxiing with the condition lever at TAXI, 

through the introduction of a revised Flight 

Manual Limitation. 

For the reasons described above, this EASA 

AD retains the requirements of EASA AD 

2007–0268, which is superseded, and 

requires the installation of a Propeller Speed 

Warning System. 

A released propeller blade could result in 

engine failure and loss of control 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. 

Restatement of Requirements of AD–2008– 

13–02 With New Requirements 

Actions 

(g) Within 90 days after July 24, 2008 (the 

effective date of AD 2008–13–02), unless 

already done, do the following actions. 

(1) Replace the existing Propeller 

Limitations Placard in the cockpit with a new 

placard, in accordance with the 

Accomplishment Instructions of BAE 

Systems (Operations) Limited Service 

Bulletin J41–11–027, dated March 29, 2007. 

(2) Revise the BAE Jetstream Series 4100 

Flight Manual (FM) to include the 

information in BAE Jetstream Series 4100 

General Amendment G12, approved January 

2007; and BAE Jetstream Series 4100 

Advance Amendment Bulletin 13, approved 

April 4, 2007. General Amendment G12 

describes a rolling take-off technique and the 

reduced possibility of landing with ice 

contaminating the wings, and adds a Gross 

Height/Pressure Altitude Conversion Chart. 

Advance Amendment Bulletin 13 introduces 

procedures for placing the propeller 

condition levers in the Flight position during 

all ground maneuvering. Operate the airplane 

according to the procedures in General 

Amendment G12 and Advance Amendment 

Bulletin 13. 

Note 1: This may be done by inserting 

copies of General Amendment G12 and 

Advance Amendment Bulletin 13 into the 

FM. When General Amendment G12 and 

Advance Amendment Bulletin 13 have been 

included in general revisions of the FM, the 

general revisions may be inserted in the FM, 

provided the relevant information in the 

general revision is identical to that in General 

Amendment G12 and Advance Amendment 

Bulletin 13. 

New Requirements of This AD 

Actions 

(h) Unless already done, do the following 

actions. 

(1) Within 6 months after the effective date 

of this AD, install a Propeller Speed Warning 

System (modification JM41674), in 

accordance with Section 2 of BAE Systems 

(Operations) Limited Aircraft Change 

Information Bulletin J41–61–014, Issue 7, 

dated August 17, 2009. Before further flight 

after modification, do the actions required in 

paragraphs (h)(1)(i) and (h)(1)(ii) of this AD. 

(i) Remove the placard that was installed 

as required by paragraph (g)(1) of this AD. 

(ii) Remove BAE Jetstream Series 4100 

Advance Amendment Bulletin 13, approved 

April 4, 2007, from the FM. 

(2) Within 6 months after the effective date 

of this AD, revise the BAE Jetstream Series 

4100 FM using a method approved in 

accordance with the procedures specified in 

paragraph (i) of this AD. 

Note 2: Guidance on revising the BAE 

Jetstream Series 4100 FM, as required by 

paragraph (h)(2) of this AD, can be found in 

BAE Jetstream Series 4100 Particular 

Amendment 111, approved July 27, 2009. 

FAA AD Differences 

Note 3: This AD differs from the MCAI 

and/or service information as follows: No 

differences. 

Other FAA AD Provisions 

(i) The following provisions also apply to 

this AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Branch, ANM–116, Transport Airplane 

Directorate, 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: Todd Thompson, 

Aerospace Engineer, International Branch, 

ANM–116, Transport Airplane Directorate, 

FAA, 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone (425) 

227–1175; fax (425) 227–1149. 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. 

(2) Airworthy Product: For any requirement 

in this AD to obtain corrective actions from 

a manufacturer or other source, use these 

actions if they are FAA-approved. Corrective 

actions are considered FAA-approved if they 

are approved by the State of Design Authority 

(or their delegated agent). You are required 

to assure the product is airworthy before it 

is returned to service. 

(3) Reporting Requirements: For any 

reporting requirement in this AD, under the 

provisions of the Paperwork Reduction Act 

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

Management and Budget (OMB) has 

approved the information collection 

requirements and has assigned OMB Control 

Number 2120–0056. 

Related Information 

(j) Refer to MCAI European Aviation Safety 

Agency (EASA) Airworthiness Directive 

2009–0038, dated February 18, 2009; and the 

service information identified in Table 1 of 

this AD; for related information. 

TABLE 1—SERVICE INFORMATION

Service information Date 

BAE Jetstream Series 4100 Advance Amendment Bulletin 13 to the Jetstream Series 4100 Flight Manual ...... April 4, 2007. 

BAE Jetstream Series 4100 General Amendment G12 to the Jetstream Series 4100 Flight Manual .................. January 2007. 

BAE Systems (Operations) Limited Aircraft Change Information Bulletin J41–61–014, Section 2, Issue 7 ......... August 17, 2009. 

BAE Systems (Operations) Limited Service Bulletin J41–11–027 ......................................................................... March 29, 2007. 

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25788 Federal Register / Vol. 75, No. 89 / Monday, May 10, 2010 / Proposed Rules 

Issued in Renton, Washington, on April 30, 

2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–10996 Filed 5–7–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0436; Directorate 

Identifier 2009–NM–230–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Model CL–600–2B19 (Regional Jet 

Series 100 & 440) 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 results from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI describes the unsafe 

condition as: 

* * * There have recently been several inservice occurrences that have highlighted the 

inability of the existing [wing anti-ice] 

system to detect a low-heat condition in the 

wing leading edge at all times, with the 

potential consequence of unannunciated 

asymmetric ice build-up on the wing. * * * 

Such a condition, in combination with 

maneuvers close to stick shaker activation, 

could possibly result in reduced 

controllability of the aircraft. 

* * * * * 

The proposed AD would require actions 

that are intended to address the unsafe 

condition described in the MCAI. 

DATES: We must receive comments on 

this proposed AD by June 24, 2010. 

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 

W12–40, 1200 New Jersey Avenue, SE., 

Washington, DC, between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Bombardier, 

Inc., 400 Coˆte-Vertu Road West, Dorval, 

Que ́bec H4S 1Y9, Canada; telephone 

514–855–5000; fax 514–855–7401; email thd.crj@aero.bombardier.com; 

Internet http://www.bombardier.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 Operations office 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 Operations 

office (telephone (800) 647–5527) is in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Wing Chan, Aerospace Engineer, 

Avionics and Flight Test Branch, ANE– 

172, FAA, New York Aircraft 

Certification Office (ACO), 1600 Stewart 

Avenue, Suite 410, Westbury, New York 

11590; telephone (516) 228–7311; fax 

(516) 794–5531. 

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–2010–0436; Directorate Identifier 

2009–NM–230–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 based on those comments. 

We have lengthened the 30-day 

comment period for proposed ADs that 

address MCAI originated by aviation 

authorities of other countries to provide 

adequate time for interested parties to 

submit comments. The comment period 

for these proposed ADs is now typically 

45 days, which is consistent with the 

comment period for domestic transport 

ADs. 

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 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued Canadian 

Airworthiness Directive CF–2009–37, 

dated September 30, 2009 (referred to 

after this as ‘‘the MCAI’’), to correct an 

unsafe condition for the specified 

products. The MCAI states: 

At present, the Wing Anti-Ice System 

(WAIS) sufficient heat switches/sensors on 

CL–600–2B19 aircraft are located at the 

inboard end of each wing and require a 

simultaneous low-pressure signal to generate 

a L or R WING A/ICE amber caution. 

However, there have recently been several inservice occurrences that have highlighted the 

inability of the existing system to detect a 

low-heat condition in the wing leading edge 

at all times, with the potential consequence 

of unannunciated asymmetric ice build-up 

on the wing. These have included partial 

failure of several piccolo ducts [ref: 

Airworthiness Directive (AD) CF–2008–30] 

and partial (not fully closed or open) failure 

of a modulating and shut-off valve, the latter 

resulting in unannunciated asymmetric ice 

build-up on the wing leading edge. Such a 

condition, in combination with maneuvers 

close to stick shaker activation, could 

possibly result in reduced controllability of 

the aircraft. 

This directive mandates: 

(a) Revision of the Airplane Flight Manual 

(AFM) to notify the flight crew that, 

following installation and activation of the 

low-heat detection switches, certain WAIS 

mode selection changes may result in a twominute inhibition of the wing anti-ice 

message, if posted; 

(b) Revision of the approved maintenance 

schedule to include one revised and three 

new functional checks that are required 

following activation of the low-heat detection 

switches; 

(c) Replacement of the Data Concentrator 

Units (DCUs) with DCUs incorporating a 

software update that caters for the new 

outboard low-heat detection switches and 

generates the appropriate anti-ice message for 

the flight crew when a low-heat condition is 

detected; 

Note: Although not related to this 

directive, the software update also corrects 

the sampling rate of two previously noncompliant Flight Data Recorder (FDR) 

parameters, normal acceleration and pitch 

attitude. 

(d) Installation of the low-heat detection 

switches in the wing outboard leading edges, 

the wing A/ICE box assembly and associated 

wires; and 

(e) Activation of the low-heat detection 

switches. 

You may obtain further information by 

examining the MCAI in the AD docket. 

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