[Federal Register Volume 86, Number 49 (Tuesday, March 16, 2021)]
[Rules and Regulations]
[Pages 14366-14370]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-05513]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0144; Project Identifier MCAI-2021-00255-R; 
Amendment 39-21473; AD 2021-06-06]
RIN 2120-AA64


Airworthiness Directives; Bell Textron Canada Limited Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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SUMMARY: The FAA is superseding Emergency Airworthiness Directive (AD) 
2021-05-52 which applied to certain Bell Textron Canada Limited (Bell) 
Model 505 helicopters. Emergency AD 2021-05-52 required a one-time 
visual inspection of the pilot collective stick and grip assembly 
(pilot collective stick), a fluorescent penetrant inspection (FPI) if 
no crack was found during the visual inspection, and depending on the 
inspection results, removing the pilot collective stick from service 
and reporting certain information to Bell. Emergency AD 2021-05-52 also 
prohibited installing any pilot collective stick on any helicopter 
unless the inspections had been accomplished. This AD removes the 
visual inspection of the pilot collective stick, requires repetitive 
FPIs of the pilot collective stick, and requires revising the existing 
Rotorcraft Flight Manual (RFM) for your helicopter. This AD retains the 
reporting requirement

[[Page 14367]]

and expands the prohibition. This AD was prompted by the determination 
that visual inspections do not adequately detect a crack and additional 
findings that a crack may occur sooner than previously expected. The 
FAA is issuing this AD to address the unsafe condition on these 
products.

DATES: This AD becomes effective March 31, 2021.
    The Director of the Federal Register approved the incorporation by 
reference of certain documents listed in this AD as of March 31, 2021.
    The FAA must receive comments on this AD by April 30, 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 Bell 
Textron Canada Limited, 12,800 Rue de l'Avenir, Mirabel, Quebec J7J1R4; 
telephone (450) 437-2862 or (800) 363-8023; fax (450) 433-0272; or at 
https://www.bellcustomer.com. You may view this service information at 
the FAA, Office of the Regional Counsel, Southwest Region, 10101 
Hillwood Pkwy., Room 6N-321, Fort Worth, TX 76177. For information on 
the availability of this material at the FAA, call (817) 222-5110. It 
is also available at https://www.regulations.gov by searching for and 
locating Docket No. FAA-2021-0144.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2021-0144; 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, the 
Transport Canada AD, any comments received, and other information. The 
street address for Docket Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Hal Jensen, Aerospace Engineer, 
Operational Safety Branch, Compliance & Airworthiness Division, FAA 
National Headquarters, 950 L'Enfant Plaza N SW, Washington, DC 20024; 
telephone (202) 267-9167; email [email protected].

SUPPLEMENTARY INFORMATION:

Background

    On February 22, 2021, the FAA issued Emergency AD 2021-05-52 
(Emergency AD 2021-05-52), which was made immediately effective to all 
known U.S. owners and operators of Bell Model 505 helicopters, serial 
numbers 65011 and subsequent. Emergency AD 2021-05-52 required, before 
further flight, removing the pilot collective stick from the jackshaft 
assembly, cleaning it, and then visually inspecting the complete 
circumference of certain areas for a crack. If the visual inspection 
did not reveal a crack, Emergency AD 2021-05-52 required performing an 
FPI for a crack. Removing from service any cracked pilot collective 
stick was required before further flight, and if a crack was 
discovered, reporting certain information to Bell was required within 
10 days.
    Emergency AD 2021-05-52 was prompted by Canadian Emergency AD CF-
2021-05, dated February 21, 2021 (Canadian AD CF-2021-05), issued by 
Transport Canada, which is the aviation authority for Canada, to 
correct an unsafe condition for Bell Model 505 helicopters, serial 
numbers 65011 and subsequent. Transport Canada advised of a report that 
a pilot collective stick cracked above the cabin floor at the junction 
with the collective jackshaft. This finding occurred prior to engine 
start during the pilot pre-flight check of flight controls for travel. 
The exact cause of the crack was still under investigation, and 
Transport Canada advised that the unsafe condition, if not addressed, 
could result in failure of the pilot collective stick and subsequent 
loss of control of the helicopter.
    Accordingly, Canadian AD CF-2021-05 required a one-time visual 
inspection and as applicable, an FPI of the pilot collective stick to 
detect cracking. If the pilot collective stick was found to be 
unserviceable, Canadian AD CF-2021-05 required replacing the collective 
stick with a serviceable part prior to further flight. Transport Canada 
advised that a serviceable collective stick is a new collective stick 
or a collective stick with no crack found during the visual inspection 
or FPI required by its AD. Transport Canada considered Canadian AD CF-
2021-05 an interim action and stated that further AD action may follow.

Actions Since Emergency AD 2021-05-52 was Issued

    Since the FAA issued Emergency AD 2021-05-52, Bell has twice 
revised its service information. The service information was first 
revised to remove the procedures for a visual inspection and instead 
specify recurring FPIs, and Transport Canada superseded Canadian AD CF-
2021-05 accordingly with Emergency AD CF-2021-05R1, dated February 26, 
2021 (Canadian AD CF-2021-05R1). Canadian AD CF-2021-05R1 advised that 
examination of a pilot collective stick and another cracked pilot 
collective stick by Bell revealed fatigue cracking. Based on these 
findings, Bell determined that a visual inspection is not adequate for 
detecting smaller cracks. Accordingly, Canadian AD CF-2021-05R1 
required an initial FPI for cracks before further flight and then at 
intervals not to exceed 25 hours time-in-service (TIS). Canadian AD CF-
2021-05R1 also contained a ferry flight provision that specifies that 
ferry flights are permitted to a maintenance base to carry out the FPI, 
provided that the helicopter is flown from the copilot seat only. 
Transport Canada considered Canadian AD CF-2021-05R1 an interim action 
and stated that further AD action may follow.
    Bell then again revised its service information to specify 
inserting a temporary revision (TR) into the RFM that prohibits single 
pilot operations from the right crew seat. Transport Canada again 
superseded its AD accordingly with Emergency AD CF-2021-05R2, dated 
March 4, 2021 (Canadian AD CF-2021-05R2). Canadian AD CF-2021-05R2 
specifies that subsequent to the issuance of Canadian AD CF-2021-05R1, 
additional FPI findings showed that cracking of the pilot collective 
stick could occur at very low flight hours. As a result, Bell published 
revised service information to introduce TRs to the RFMs to prohibit 
single pilot operations from the right crew seat. Transport Canada 
considers Canadian AD CF-2021-05R2 an interim action as well and states 
that further AD action may follow to mandate further corrective actions 
to modify the pilot collective stick to prevent cracking and subsequent 
failure.

FAA's Determination

    These helicopters have been approved by the aviation authority of 
Canada and are approved for operation in the United States. Pursuant to 
the FAA's bilateral agreement with Canada, Transport Canada, its 
technical representative, has notified the FAA of the unsafe condition 
described in its AD. The FAA is issuing this AD after evaluating all 
known relevant information and determining that the unsafe condition 
described previously is likely to exist or develop

[[Page 14368]]

on other helicopters of the same type design.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Bell Alert Service Bulletin 505-21-20, Revision B, 
dated March 3, 2021 (ASB 505-21-20 Rev B). ASB 505-21-20 Rev B provides 
instructions for an initial and recurring FPIs for cracks in the pilot 
collective stick and grip assembly part number M207-20M478-041/-043/-
047 on Bell Model 505 helicopters, serial numbers 65011 and subsequent. 
ASB 505-21-20 Rev B also specifies inserting TRs into the RFMs that 
prohibit single pilot operations from the right crew seat until further 
notice. Finally, ASB 505-21-20 Rev B specifies that if the right crew 
seat pilot collective stick assembly was previously confirmed 
serviceable following an FPI in accordance with Bell Alert Service 
Bulletin 505-21-20, Revision A, dated February 26, 2021 (ASB 505-21-20 
Rev A), which is not incorporated by reference in this AD, then the 25 
flight hour recurring FPI of the right crew seat pilot collective stick 
assembly is no longer required provided that the helicopter is only 
operated single pilot in command (PIC) from the left crew seat. If 
conducting dual pilot operations, ASB 505-21-20 Rev B specifies a 25 
flight hour recurring FPI of the right crew seat pilot collective stick 
assembly.
    The FAA also reviewed Bell 505 RFM TR for Pilot Collective (ASB 
505-21-20), BHT-505-FM-1, Temporary Revision (TR-6) (BHT-505-FM-1, TR-
6) and Bell 505 RFM TR for Pilot Collective (ASB 505-21-20), BHT-505-
FM-2, Temporary Revision (TR-1), each dated March 3, 2021. These TRs 
specify changes to Section 1 of the RFM Limitations Section that the 
minimum flight crew consists of one pilot that shall operate from the 
left crew seat and that dual operation is approved provide that the PIC 
occupies the left crew seat. BHT-505-FM-1, TR-6 also prohibits use of 
SPLIT-COM mode.
    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.

Other Related Service Information

    The FAA reviewed Bell ASB 505-21-20, dated February 20, 2021 (ASB 
505-21-20) and ASB 505-21-20 Rev A. ASB 505-21-20 specifies a one-time 
inspection for cracks of the pilot collective stick and grip assembly. 
ASB 505-21-20 Rev A removes the visual inspection and adds a repetitive 
FPI.

AD Requirements

    This AD requires, before further flight, revising Section 1, the 
Limitations section of the existing RFM for your helicopter to prohibit 
single pilot operations from the right crew seat, require the pilot in 
command to occupy the left crew seat for dual pilot operations, and 
depending on configuration, prohibiting the use of SPLIT-COM mode. This 
AD also requires, before further flight and thereafter at intervals not 
to exceed 25 hours TIS, removing the pilot collective stick from the 
jackshaft assembly, cleaning it as specified in ASB 505-21-20 Rev B, 
and performing an FPI for a crack as specified in ASB 505-21-20 Rev B. 
Removing from service any cracked pilot collective stick is required 
before further flight. In addition, this AD requires, within 10 days 
after the discovery of any crack, reporting certain information to 
Bell. This AD also prohibits installing any pilot collective stick and 
grip assembly on any helicopter unless it has successfully passed the 
FPI inspection requirements of this AD. Lastly, this AD prohibits 
relief under any Master Minimum Equipment List or Minimum Equipment 
List for the Audio Panel when the aircraft is operated with a single 
pilot.

Differences Between This AD and the Transport Canada

    This AD prohibits relief under any Master Minimum Equipment List or 
Minimum Equipment List for the Audio Panel when the aircraft is 
operated with a single pilot, whereas Canadian AD CF-2021-05R2 does 
not. Canadian AD CF-2021-05R2 requires the repetitive FPI if the 
aircraft is not flown solely from the left crew seat whereas this AD 
requires FPI regardless.

Interim Action

    The FAA considers this AD to be an interim action and acknowledges 
that the requirement to revise the existing RFM for your helicopter to 
require the pilot in command to occupy the left crew seat, and, 
depending on configuration, prohibit the use of SPLIT-COM mode may 
impact seat-dependent training for some helicopters operating under 
Part 135. However, the unsafe condition requires the FAA to mandate 
these requirements for continued operational safety. The inspection 
reports that are required by this AD will enable the FAA to obtain 
better insight into the cause of the cracking, and eventually develop 
final action to address the unsafe condition. Once final action has 
been identified, the FAA might consider further rulemaking.

Justification for Immediate Adoption and Determination of the Effective 
Date

    Section 553(b)(3)(B) of the Administrative Procedure Act (APA) (5 
U.S.C. 551 et seq.) authorizes agencies to dispense with notice and 
comment procedures for rules when the agency, for ``good cause,'' finds 
that those procedures are ``impracticable, unnecessary, or contrary to 
the public interest.'' Under this section, an agency, upon finding good 
cause, may issue a final rule without providing notice and seeking 
comment prior to issuance. Further, section 553(d) of the APA 
authorizes agencies to make rules effective in less than thirty days, 
upon a finding of good cause.
    An unsafe condition exists that requires the immediate adoption of 
this AD without providing an opportunity for public comments prior to 
adoption. The FAA has found that the risk to the flying public 
justifies foregoing notice and comment prior to adoption of this rule 
because certain requirements must be accomplished before further 
flight. Accordingly, notice and opportunity for prior public comment 
are impracticable and contrary to the public interest pursuant to 5 
U.S.C. 553(b)(3)(B).
    In addition, the FAA finds that good cause exists pursuant to 5 
U.S.C. 553(d) for making this amendment effective in less than 30 days, 
for the same reasons the FAA found good cause to forego notice and 
comment.

Comments Invited

    The FAA invites you to send any written data, views, or arguments 
about this final rule. Send your comments to an address listed under 
ADDRESSES. Include ``Docket No. FAA-2021-0144; Project Identifier MCAI-
2021-00255-R'' at the beginning of your comments. The most helpful 
comments reference a specific portion of the final rule, 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 
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, to 
https://www.regulations.gov, including any personal information you 
provide. The agency will also post a report summarizing each 
substantive verbal contact received about this final rule.

[[Page 14369]]

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 Hal 
Jensen, Aerospace Engineer, Operational Safety Branch, Compliance & 
Airworthiness Division, FAA National Headquarters, 950 L'Enfant Plaza N 
SW, Washington, DC 20024; telephone (202) 267-9167; email 
[email protected]. Any commentary that the FAA receives which is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Regulatory Flexibility Act

    The requirements of the Regulatory Flexibility Act (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 prior notice and 
comment, RFA analysis is not required.

Costs of Compliance

    The FAA estimates that this AD affects 88 helicopters of U.S. 
Registry. Labor rates are estimated at $85 per work-hour. Based on 
these numbers, the FAA estimates the following costs to comply with 
this AD.
    Removing, cleaning, performing the FPI of the pilot collective 
stick, and installing a serviceable pilot collective stick takes about 
3 work-hours for an estimated cost of $255 per helicopter and $22,440 
for the U.S. fleet per inspection cycle. A replacement pilot collective 
stick costs about $1,979 per helicopter. If required, reporting 
information takes about 1 work-hour for an estimated cost of $85 per 
instance.
    Revising the existing RFM for your helicopter takes about 0.5 work-
hour for an estimated cost of $43 per helicopter.
    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some of the costs of this AD 
may be covered under warranty, thereby reducing the cost impact on 
affected operators.

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a currently valid OMB Control Number. The OMB 
Control Number for this information collection is 2120-0056. Public 
reporting for this collection of information is estimated to be 
approximately 1 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Send comments regarding this burden estimate 
or any other aspect of this collection of information, including 
suggestions for reducing this burden, to: Information Collection 
Clearance Officer, Federal Aviation Administration, 10101 Hillwood 
Parkway, Fort Worth, TX 76177-1524.

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, 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

0
1. The authority citation for part 39 continues to read as follows:

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


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

2021-06-06 Bell Textron Canada Limited: Amendment 39-21473; Docket 
No. FAA-2021-0144; Project Identifier MCAI-2021-00255-R.

(a) Effective Date

    This airworthiness directive (AD) is effective March 31, 2021.

(b) Affected ADs

    This AD replaces Emergency AD 2021-05-52, Project Identifier 
MCAI-2021-00217-R, dated February 22, 2021.

(c) Applicability

    This AD applies to Bell Textron Canada Limited Model 505 
helicopters, serial numbers 65011 and subsequent, certificated in 
any category.

(d) Subject

    Joint Aircraft Service Component (JASC) Code: 6710, Main Rotor 
Control.

(e) Unsafe Condition

    This AD was prompted by a report of a cracked pilot collective 
stick. The FAA is issuing this AD to detect a cracked pilot 
collective stick which, if not corrected, could result in failure of 
the pilot collective stick and subsequent loss of control of the 
helicopter.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    (1) Before further flight after the effective date of this AD, 
revise the Limitations section of the existing Rotorcraft Flight 
Manual (RFM) for your helicopter by inserting Bell 505 RFM Temporary 
Revision (TR) for Pilot

[[Page 14370]]

Collective (ASB 505-21-20), BHT-505-FM-1, Temporary Revision (TR-6) 
or Bell 505 RFM TR for Pilot Collective (ASB 505-21-20), BHT-505-FM-
2, Temporary Revision (TR-1), each dated March 3, 2021, as 
applicable to your helicopter. Using a different document with 
information identical to the information for the ``Flight Crew'' and 
``Configuration,'' as applicable to your helicopter, in the RFM TR 
specified in this paragraph for your helicopter is acceptable for 
compliance with the requirements of this paragraph. This action may 
be performed by the owner/operator (pilot) holding at least a 
private pilot certificate and must be entered into the aircraft 
records showing compliance with this AD in accordance with Sec.  
43.9(a)(1) through (4) and Sec.  91.417(a)(2)(v). The record must be 
maintained as required by Sec.  91.417, Sec.  121.380, or Sec.  
135.439.
    (2) Before further flight after the effective date of this AD, 
and thereafter at intervals not to exceed 25 hours time-in-service:
    (i) Remove the pilot collective stick and grip assembly from the 
jackshaft assembly and clean the areas specified in Figure 2 of Bell 
Alert Service Bulletin 505-21-20, Revision B, dated March 3, 2021 
(ASB 505-21-20 Rev B) with a clean cloth C-516C or equivalent 
moistened with dry cleaning solvent C-304 or equivalent.
    (ii) Perform a fluorescent penetrant inspection (FPI) for a 
crack by following the Accomplishment Instructions, paragraph 5. 
(but not paragraphs 5.a. and b.) of ASB 505-21-20 Rev B. Perform 
this FPI in the areas specified in Figure 2 of ASB 505-21-20 Rev B. 
If there is a crack, before further flight, remove the pilot 
collective stick and grip assembly from service.
    (3) Within 10 days after the discovery of any crack, report the 
information specified in paragraph 5.a. of ASB 505-21-20 Rev B to 
Bell Product Support Engineering at [email protected].
    (4) As of the effective date of this AD, do not install any 
pilot collective stick and grip assembly on any helicopter unless 
the actions required by paragraphs (g)(2)(i) and (ii) have been 
accomplished.
    (5) As of the effective date of this AD, relief under any Master 
Minimum Equipment List or Minimum Equipment List for the Audio Panel 
is prohibited when the aircraft is operated with a single pilot.

(h) Credit for Previous Actions

    If you performed an FPI of the pilot collective stick and grip 
assembly before the effective date of this AD using Bell Alert 
Service Bulletin 505-21-20, dated February 20, 2021, or Bell Alert 
Service Bulletin 505-21-20, Revision A, dated February 26, 2021, you 
met the before further flight FPI requirement of paragraph (g)(2) of 
this AD.

(i) Special Flight Permits

    A special flight permit to a maintenance facility may be granted 
provided that:
    (1) There are no passengers on-board,
    (2) The helicopter is flown from the copilot seat only, and
    (3) The GMA (intercom) is operative.

(j) Alternative Methods of Compliance (AMOCs)

    (1) 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 local Flight 
Standards District Office, as appropriate. If sending information 
directly to the manager of the International Validation office, send 
it to the attention of the person identified in paragraph (k)(1) of 
this AD. Information may be emailed to: [email protected].
    (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.

(k) Related Information

    (1) Hal Jensen, Aerospace Engineer, Operational Safety Branch, 
Compliance & Airworthiness Division, FAA National Headquarters, 950 
L'Enfant Plaza N SW, Washington, DC 20024; telephone (202) 267-9167; 
email [email protected].
    (2) The subject of this AD is addressed in Transport Canada 
Emergency AD CF-2021-05R2, dated March 4, 2021. You may view the 
Transport Canada AD on the internet at https://www.regulations.gov 
in Docket No. FAA-2021-0144.

(l) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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) Bell Alert Service Bulletin 505-21-20, Revision B, dated 
March 3, 2021.
    (ii) Bell 505 Rotorcraft Flight Manual Temporary Revision for 
Pilot Collective (ASB 505-21-20), BHT-505-FM-1, Temporary Revision 
(TR-6), dated March 3, 2021.
    (iii) Bell 505 Rotorcraft Flight Manual Temporary Revision for 
Pilot Collective (ASB 505-21-20), BHT-505-FM-2, Temporary Revision 
(TR-1), dated March 3, 2021.
    (3) For service information identified in this AD, contact Bell 
Textron Canada Limited, 12,800 Rue de l'Avenir, Mirabel, Quebec 
J7J1R4; telephone (450) 437-2862 or (800) 363-8023; fax (450) 433-
0272; or at https://www.bellcustomer.com.
    (4) You may view this service information at the FAA, Office of 
the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 
6N-321, Fort Worth, TX 76177. For information on the availability of 
this material at the FAA, call (817) 222-5110.
    (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: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on March 10, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2021-05513 Filed 3-12-21; 4:15 pm]
BILLING CODE 4910-13-P