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

77044 

Vol. 88, No. 215 

Wednesday, November 8, 2023 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2139; Project 

Identifier MCAI–2023–00435–T] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Bombardier, Inc., Model BD– 

700–2A12 airplanes. This proposed AD 

was prompted by reports from the 

supplier that some overheat detection 

sensing elements of the bleed air leak 

detection system were manufactured 

with insufficient salt fill, which can 

result in an inability to detect hot bleed 

air leaks. This proposed AD would 

require maintenance records 

verification, and if an affected part is 

installed, would prohibit the use of 

certain Master Minimum Equipment 

List (MMEL) items under certain 

conditions by requiring revising the 

operator’s existing MEL. This proposed 

AD would also require testing the 

overheat detection sensing elements, 

marking each serviceable sensing 

element with a witness mark, and 

replacing each nonserviceable part with 

a serviceable part. This proposed AD 

would also prohibit the installation of 

affected parts under certain conditions. 

The FAA is proposing this AD to 

address the unsafe condition on these 

products. 

DATES: The FAA must receive comments 

on this proposed AD by December 26, 

2023. 

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 

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. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2139; 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 NPRM, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

Material Incorporated by Reference: 

• For Bombardier service information 

identified in this NPRM, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte-Vertu Road 

West, Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email: 

ac.yul@aero.bombardier.com; website: 

bombardier.com. 

• For Liebherr-Aerospace Toulouse 

SAS service information identified in 

this NPRM, contact Liebherr-Aerospace 

Toulouse SAS, 408, Avenue des EtatsUnis—B.P.52010, 31016 Toulouse 

Cedex, France; telephone +33 

(0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email: 

techpub.toulouse@liebherr.com; 

website: www.liebherr.aero. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email: 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2139; Project Identifier 

MCAI–2023–00435–T’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend the proposal 

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, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

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 NPRM 

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 NPRM, 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 

NPRM. Submissions containing CBI 

should be sent to Steven Dzierzynski, 

Aviation Safety Engineer, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

NY 11590; telephone 516- 228–7300; 

email: 9-avs-nyaco-cos@faa.gov. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

Transport Canada, which is the 

aviation authority for Canada, has 

issued Transport Canada AD CF–2023– 

18, dated March 9, 2023 (Transport 

Canada AD CF–2023–18) (also referred 

to after this as the MCAI), to correct an 

unsafe condition on certain Bombardier, 


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Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77045 

Inc., Model BD–700–2A12 airplanes. 

The MCAI states that Bombardier 

received reports from the supplier of the 

overheat detection sensing elements of a 

manufacturing quality escape. Some of 

the sensing elements of the bleed air 

leak detection system were 

manufactured with insufficient salt fill. 

This condition can result in an inability 

to detect hot bleed air leaks, which can 

cause damage to surrounding structures 

and systems and prevent continued safe 

flight and landing. 

The FAA is proposing this AD to 

address the unsafe condition on these 

products. You may examine the MCAI 

in the AD docket at regulations.gov 

under Docket No. FAA–2023–2139. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Liebherr Service 

Bulletin CFD–F1958–26–01, dated May 

6, 2022, which specifies part numbers 

for affected sensing elements. 

The FAA reviewed Bombardier 

Service Bulletin 700–36–7503, dated 

December 23, 2022, which specifies 

procedures for testing each leak 

detection loop (LDL) sensing element 

installed on the airplane, marking each 

serviceable sensing element with a 

witness mark, and replacing each 

nonserviceable part with a serviceable 

part. 

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 

This product has been approved by 

the aviation authority of another 

country, and is approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI and service 

information described above. The FAA 

is issuing this NPRM after determining 

that the unsafe condition described 

previously is likely to exist or develop 

on other products of the same type 

design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

maintenance records verification. If an 

affected part is installed, this proposed 

AD would prohibit the use of certain 

MMEL items unless specific dispatch 

instructions are followed by revising the 

operator’s existing MEL and 

accomplishing the actions specified in 

the service information already 

described. For certain airplanes, this 

proposed AD would also require testing 

each LDL sensing element installed on 

the airplane, marking each serviceable 

sensing element with a witness mark, 

and replacing each nonserviceable part 

with a serviceable part. This proposed 

AD would also prohibit the installation 

of affected parts under certain 

conditions. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 19 

airplanes of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

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

Up to 214 work-hours × $85 per hour = Up to 

$18,190.

$0 Up to $18,190 .................................... Up to $345,610. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition actions specified in 

this proposed AD. The FAA estimates it 

would take up to 1.5 hours to replace a 

sensing element. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

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 

The FAA 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) Would not affect intrastate 

aviation in Alaska, and 

(3) Would 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. 

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 adding 

the following new airworthiness 

directive: 

Bombardier, Inc.: Docket No. FAA–2023– 

2139; Project Identifier MCAI–2023– 

00435–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 26, 

2023. 


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77046 Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–700–2A12 airplanes, certificated 

in any category, having serial numbers 70005 

and subsequent. 

(d) Subject 

Air Transport Association (ATA) of 

America Code: 36, Pneumatic. 

(e) Unsafe Condition 

This AD was prompted by reports that 

some overheat detection sensing elements of 

the bleed air leak detection system were 

manufactured with insufficient salt fill. The 

FAA is issuing this AD to address nonconforming sensing elements of the bleed air 

leak detection system. The unsafe condition, 

if not addressed, could result in an inability 

to detect hot bleed air leaks and consequent 

damage to surrounding structures and 

systems, which could prevent continued safe 

flight and landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Definitions 

For the purpose of this AD, the definitions 

specified in paragraphs (g)(1) and (2) of this 

AD apply. 

(1) An affected part is a sensing element 

marked with a date code before A2105 and 

having an LTS/Kidde part number specified 

in Liebherr Service Bulletin CFD–F1958–26– 

01, dated May 6, 2022, unless that sensing 

element meets the criteria specified in 

paragraph (g)(1)(i) or (ii) of this AD. 

(i) The sensing element has been tested as 

specified in Section 3 of the Accomplishment 

Instructions of Kidde Aerospace and Defense 

Service Bulletin CFD–26–1, Revision 6, dated 

February 28, 2022, or earlier revisions, and 

has been found to be serviceable; and the 

sensing element has been marked on one face 

of its connector hex nut and packaged as 

specified in Section 3.C. of the 

Accomplishment Instructions of Kidde 

Aerospace and Defense Service Bulletin 

CFD–26–1, Revision 6, dated February 28, 

2022, or earlier revisions. 

(ii) The sensing element has been tested 

and found to be serviceable as specified in 

paragraph (j) of this AD; and the sensing 

element has been marked on one face of one 

connector hex nut with one green mark, as 

specified in Figure 33 of Bombardier Service 

Bulletin 700–36–7503, dated December 23, 

2022, as applicable (the figure is 

representative for all sensing elements). 

(2) A serviceable part is a sensing element 

that is not an affected part. 

(h) Maintenance Records Verification 

For airplane serial numbers 70097 and 

subsequent whose airplane date of 

manufacture, as identified on the 

identification plate of the airplane, is on or 

before the effective date of this AD: Within 

60 days after the effective date of this AD, 

examine the airplane maintenance records to 

verify whether any affected part has been 

installed since the airplane date of 

manufacture, as identified on the 

identification plate of the airplane. 

(1) If the maintenance records confirms 

that an affected part has been installed, or if 

it cannot be confirmed that an affected part 

has not been installed, paragraphs (i) and (j) 

of this AD must be complied with within the 

compliance time specified in paragraphs (i) 

and (j) of this AD. 

(2) If the maintenance records confirm that 

no affected parts have been installed since 

airplane date of manufacture, then 

paragraphs (i) and (j) of this AD are not 

applicable. 

(i) Minimum Equipment List (MEL) Revision 

For all airplanes: Within 90 days after the 

effective date of this AD, revise the operator’s 

existing MEL by incorporating the 

information specified in figures 1 through 7 

to paragraph (i) of this AD, as applicable. 

This may be done by inserting a copy of this 

information into the operator’s existing MEL. 

Figure 1 to Paragraph (i)—MMEL Item 21– 

0425 

BILLING CODE 4910–13–P 


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MMEL Item 21-0425 

Crew Alerting System 

(CAS) Message 

21 AIR COND / PRESS -

TRIM LOOP ONE 

ELEMENT INOP 

1. OPERATIONS (0) 

Before each flight: 

1. Repair 2. Dispatch Consideration 

Category 

C (0) May be displayed provided none of the 

following messages are displayed: 

- 21 AIR COND / PRESS - IASC IB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

- 21 AIR COND / PRESS - IASC lB FAULT 

- 21 AIR COND / PRESS - IASC 2B FAULT 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

i. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, turn the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 21 AIR COND / PRESS - TRIM LOOP ONE 

ELEMENT 

INOP info message as follows: 

1. If the 21 AIR COND / PRESS - TRIM LOOP ONE ELEMENT INOP info 

message shows-DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 21 AIR COND / PRESS - TRIM LOOP ONE ELEMENT INOP info 

message does not show - DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 
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d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS-IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77049 

Figure 2 to Paragraph (i)—MMEL Item 30– 

0055 


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MMEL Item 30-0055 

CAS Message 1. Repair 2. Dispatch Consideration 

Category 

30 ICE PROT - L WING C (0) May be displayed provided none of the 

LOOP ONE ELEMENT following messages are displayed: 

INOP - 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

-21 AIR COND / PRESS-IASC lB FAULT 

-21 AIR COND / PRESS-IASC 2B FAULT 

1. OPERATIONS (0) 

Before each flight: 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, tum the APU switch to START. 

b. When external AC ower is on or APU is runnin , wait a minimum of 6 minutes. 
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c. After 6 minutes, check for the 30 ICE PROT - L WING LOOP ONE ELEMENT 

INOP info message as follows: 

1. If the 30 ICE PROT-L WING LOOP ONE ELEMENT INOP info message 

shows 

- DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 30 ICE PROT-L WING LOOP ONE ELEMENT INOP info message 

does 

not show - DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS -IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77051 

Figure 3 to Paragraph (i)—MMEL Item 30– 

0060 


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MMEL Item 30-0060 

CAS Message 1. Repair 2. Dispatch Consideration 

Category 

30 ICE PROT - L WIPS C (0) May be displayed provided none of the 

LOOP ONE ELEMENT following messages are displayed: 

INOP - 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

- 21 AIR COND / PRESS - IASC lB FAULT 

- 21 AIR COND / PRESS - IASC 2B FAULT 

1. OPERATIONS (0) 

Before each flight: 
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(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, tum the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 30 ICE PROT - L WIPS LOOP ONE ELEMENT INOP 

info message as follows: 

1. If the 30 ICE PROT- L WIPS LOOP ONE ELEMENT INOP info message 

shows 

- DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 30 ICE PROT- L WIPS LOOP ONE ELEMENT INOP info message 

does 

not show - DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS -IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77053 

Figure 4 to Paragraph (i)—MMEL Item 30– 

0090 


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MMEL Item 30-0090 

CAS Message 1. Repair 2. Dispatch Consideration 

Category 

30 ICE PROT - R WING C (0) May be displayed provided none of the 

LOOP ONE ELEMENT following messages are displayed: 

INOP - 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

- 21 AIR COND / PRESS - IASC lB FAULT 

- 21 AIR COND / PRESS - IASC 2B FAULT 

1. OPERATIONS (0) 

Before each flight: 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, tum the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 30 ICE PROT - R WING LOOP ONE ELEMENT 

INOP info message as follows: 

1. If the 30 ICE PROT-R WING LOOP ONE ELEMENT INOP info message 

shows - DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 30 ICE PROT-R WING LOOP ONE ELEMENT INOP info message 

does 

not show-DISPATCH IS NOT PERMITTED. 
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Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS -IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77055 

Figure 5 to Paragraph (i)—MMEL Item 30– 

0095 


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MMEL Item 30-0095 

CAS Message 

30 ICE PROT - R WIPS 

LOOP ONE ELEMENT 

INOP 

1. OPERATIONS (0) 

Before each flight: 

1. Repair 2. Dispatch Consideration 

Category 

C (0) May be displayed provided none of the 

following messages are displayed: 

- 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

- 21 AIR COND / PRESS - IASC lB FAULT 

- 21 AIR COND / PRESS - IASC 2B FAULT 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 
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3. On the APU control panel, turn the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 30 ICE PROT - R WIPS LOOP ONE ELEMENT INOP 

info message as follows: 

1. If the 30 ICE PROT-R WIPS LOOP ONE ELEMENT INOP info message 

shows 

-DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 30 ICE PROT- R WIPS LOOP ONE ELEMENT INOP info message 

does 

not show - DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS -IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77057 

Figure 6 to Paragraph (i)—MMEL Item 36– 

0050 


lotter on DSK11XQN23PROD with PROPOSALS1EP08NO23.016</GPH>

MMEL Item 36-0050 

CAS Message 1. Repair 2. Dispatch Consideration 

Category 

36 BLEED - L BLEED C (0) May be displayed provided none of the 

LOOP ONE ELEMENT following messages are displayed: 

INOP - 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

-21 AIRCOND/PRESS-IASC lBFAULT 

- 21 AIR COND / PRESS - IASC 2B FAULT 

1. OPERATIONS (0) 
77058 Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 


lotter on DSK11XQN23PROD with PROPOSALS1EP08NO23.017</GPH>

Before each flight: 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

11. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, tum the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 36 BLEED - L BLEED LOOP ONE ELEMENT INOP 

info message as follows: 

1. If the 36 BLEED - L BLEED LOOP ONE ELEMENT INOP info message 

shows-DISPATCH IS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

11. If the 36 BLEED - L BLEED LOOP ONE ELEMENT INOP info message 

does not 

show - DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND I PRESS - IASC lB INOP info 

- 21 AIR COND I PRESS - IASC 2B INOP info 

- 21 AIR CONDI PRESS - IASC IB FAULT info 

-21 AIR CONDI PRESS -IASC 2B FAULT info 
Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 77059 

Figure 7 to Paragraph (i)—MMEL Item 36– 

0105 


lotter on DSK11XQN23PROD with PROPOSALS1EP08NO23.018</GPH>

l'v1l\1EL Item 36-0105 

CAS Message 1. Repair 2. Dispatch Consideration 

Category 

36 BLEED - R BLEED C (0) May be displayed provided none of the 

LOOP ONE ELEMENT following messages are displayed: 

TNOP 

- 21 AIR COND / PRESS - IASC lB INOP 

- 21 AIR COND / PRESS - IASC 2B INOP 

-21 AIR COND / PRESS-IASC lB FAULT 

-21 AIR COND / PRESS-IASC 2B FAULT 

1. OPERATIONS (0) 

Before each flight: 

(1) Make sure that the airplane is not powered on and that engines and APU are OFF. 

a. Connect electrical power to the airplane as follows: 

Note: Do not use a Jet Airstart Cart or High Pressure Ground Cart. 

1. Connect external AC power, OR 

ii. Start the APU as follows: 

1. On the ELECTRICAL control panel, set the MAIN BATT and APU BATT 

switches to ON. 

2. On the BLEED/ AIR COND control panel, make sure that the APU 

BLEED switch is set to OFF. 

3. On the APU control panel, turn the APU switch to START. 

b. When external AC power is on or APU is running, wait a minimum of 6 minutes. 

c. After 6 minutes, check for the 36 BLEED - R BLEED LOOP ONE ELEMENT TNOP 

info message as follows: 

1. If the 36 BLEED - R BLEED LOOP ONE ELEMENT INOP info message 

shows -DISPATCH lS PERMITTED. 

Note: The INFO message confirms it is not heat related and therefore cannot be 

a potential leak in the presence of an affected part. 

ii. If the 36 BLEED -R BLEED LOOP ONE ELEMENT INOP info message 

does 

not show-DISPATCH IS NOT PERMITTED. 

Note: No INFO message confirms that it is heat related and therefore could be a 

potential leak in the presence of an affected part. 
77060 Federal Register / Vol. 88, No. 215 / Wednesday, November 8, 2023 / Proposed Rules 

BILLING CODE 4910–13–C 

(j) Testing and Replacement of Affected 

Overheat Detection Sensing Elements 

For airplane serial numbers 70005 and 

subsequent: Within 3,500 flight hours or 120 

months, whichever occurs first, from the 

effective date of this AD, test the overheat 

detection sensing elements to determine if 

they are serviceable, in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin 700–36–7503, dated 

December 23, 2022. 

(1) For each sensing element that is 

serviceable, before further flight, mark the 

sensing element with a witness mark in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

700–36–7503, dated December 23, 2022. 

(2) For each sensing element that is not 

serviceable, before further flight, replace the 

sensing element with a serviceable part in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

700–36–7503, dated December 23, 2022. 

(k) Parts Installation Prohibition 

As of the effective date of this AD, no 

person may install, on any airplane, any 

affected part unless it is a serviceable part. 

(l) No Reporting Requirement 

Although Bombardier Service Bulletin 

700–36–7503, dated December 23, 2022, 

specifies to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(m) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation 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 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, mail it to ATTN: Program Manager, 

Continuing Operational Safety, at the address 

identified in paragraph (n)(2) of this AD or 

email to: 9-avs-nyaco-cos@faa.gov. If mailing 

information, also submit information by 

email. Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or 

Bombardier, Inc.’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(n) Additional Information 

(1) Refer to Transport Canada AD CF– 

2023–18, dated March 9, 2023, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–2139. 

(2) For more information about this AD, 

contact Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email: 9-avs-nyaco-cos@faa.gov. 

(o) 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 this AD specifies otherwise. 

(i) Bombardier Service Bulletin 700–36– 

7503, dated December 23, 2022. 

(ii) Liebherr Service Bulletin CFD–F1958– 

26–01, dated May 6, 2022. 

(3) For Bombardier service information 

identified in this AD, contact Bombardier 

Business Aircraft Customer Response Center, 

400 Coˆte-Vertu Road West, Dorval, Que ́bec 

H4S 1Y9, Canada; telephone 514–855–2999; 

email: ac.yul@aero.bombardier.com; website: 

bombardier.com. 

(4) For Liebherr-Aerospace Toulouse SAS 

service information identified in this AD, 

contact Liebherr-Aerospace Toulouse SAS, 

408, Avenue des Etats-Unis—B.P.52010, 

31016 Toulouse Cedex, France; telephone 

+33 (0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email: techpub.toulouse@

liebherr.com; website: www.liebherr.aero. 

(5) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

Street, Des Moines, WA. For information on 

the availability of this material at the FAA, 

call 206–231–3195. 

(6) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on October 26, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–24008 Filed 11–7–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2143; Project 

Identifier MCAI–2023–00088–A] 

RIN 2120–AA64 

Airworthiness Directives; Diamond 

Aircraft Industries GmbH Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2022–21–15, which applies to certain 

Diamond Aircraft Industries GmbH 

(DAI) Model DA 42, DA 42 NG, and DA 

42 M–NG airplanes. AD 2022–21–15 

requires replacing the rudder T-yoke 


lotter on DSK11XQN23PROD with PROPOSALS1EP08NO23.019</GPH>

d. If required, remove external AC power from the airplane. 

e. If required, set APU BLEED to AUTO. 

(2) On the INFO synoptic page, make sure that the messages that follow do not show: 

Note: Confirm the airplane has electrical power to activate the synoptic page. 

- 21 AIR COND / PRESS - IASC lB INOP info 

- 21 AIR COND / PRESS - IASC 2B INOP info 

-21 AIR COND / PRESS -IASC lB FAULT info 

-21 AIR COND / PRESS -IASC 2B FAULT info