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PROPOSED AD BRITISH AEROSPACE (OPERATIONS) LIMITED AND BRITISH AEROSPACE REGIONAL AIRCRAFT: Docket No. FAA-2021-0961; Project Identifier MCAI-2021-00924-A.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    December 27, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to British Aerospace (Operations) Limited and  British
    Aerospace  Regional  Aircraft Model  Jetstream  Series 200,  Jetstream
    Model  3101,  and Jetstream  Model  3201 airplanes,  serial  numbers 1
    through  927  and  929  through  936  inclusive,  certificated  in any
    category.

(d) SUBJECT

    Joint Aircraft System  Component (JASC)  Code  2770,  Gust Lock/Damper
    System.

(e) UNSAFE CONDITION

    This AD was prompted by 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 a bent control rod  within the
    gust lock system, which may enable both power levers to be pushed into
    the flight range with  the gust lock lever  fully engaged. The FAA  is
    issuing this AD to detect and correct bent push rod assemblies of  the
    power  lever baulk  system. The  unsafe condition,  if not  addressed,
    could result in loss of airplane control.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) ACTION

    Within 2 years  after the effective date of this AD,  replace push rod
    assembly  part  number (P/N)  137201E419  with push  rod  assembly P/N
    137201E429 by following the Accomplishment Instructions, sections 2.A.
    through 2.C. in Jetstream Series 3100/3200 Service Bulletin 27-JM 5350
    Revision 1, dated May 6, 1994.

(h) 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
    certification  office,  send  it  to  the  attention  of  the   person
    identified in paragraph (i)(1) of this AD or email: 9-AVS-AIR-730-AMOC
    @faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(i) RELATED INFORMATION

(1) For more information  about this AD,  contact  Doug Rudolph,  Aviation
    Safety Engineer,  General Aviation & Rotorcraft Section, International
    Validation Branch, FAA, 901 Locust,  Room 301,  Kansas City, MO 64106;
    phone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@faa.
    gov.

(2) For the Jetstream Series 3100/3200 service information  identified  in
    this AD,  contact  BAE Systems (Operations) Ltd,  Customer Information
    Department, Prestwick International Airport, Ayrshire,  KA9 2RW, Scot-
    land,  United Kingdom;  phone: +44 3300 488727;  fax: +44 1292 675704;
    email: RApublications@baesystems.com; website: https://www.baesystems.
    com/Businesses/RegionalAircraft/.  You may view  this service informa-
    tion at the FAA,  Airworthiness Products Section,  Operational  Safety
    Branch,  901 Locust,  Kansas City, MO 64106.  For information  on  the
    availability of this material at the FAA, call (816) 329-4148.

Issued on November 2, 2021. Lance T Gant, Director, Compliance & Airworth-
iness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this proposed AD  by December 27,
2021.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0961; Project Identifier MCAI-2021-00924-A]
RIN 2120-AA64

Airworthiness Directives; British Aerospace (Operations) Limited
and British Aerospace Regional Aircraft 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 British Aerospace (Operations) Limited and British
Aerospace Regional Aircraft Model Jetstream Series 200, Jetstream Model
3101, and Jetstream Model 3201 airplanes. This proposed AD was prompted
by 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 identifies the unsafe
condition as a bent control rod within the gust lock system, which may
enable both power levers to be pushed into the flight range with the
gust lock lever fully engaged. This proposed AD would require replacing
the push rod assembly with a modified push rod assembly. 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
27, 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 NPRM, contact BAE
Systems (Operations) Ltd, Customer Information Department, Prestwick
International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom;
phone: +44 3300 488727; fax: +44 1292 675704; email:
RApublications@baesystems.com; website: https://www.baesystems.com/Businesses/RegionalAircraft/.
You may view this service information at the FAA, Airworthiness
Products Section, Operational Safety Branch, 901 Locust, Kansas City,
MO 64106. For information on the availability of this material at the
FAA, call (816) 329-4148.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0961; 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 MCAI,
any comments received, and other information. The street address for
Docket Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aviation Safety
Engineer, General Aviation & Rotorcraft Section, International
Validation Branch, FAA, 901 Locust, Room 301, Kansas City, MO 64106;
phone: (816) 329-4059; fax: (816) 329-4090; email:
doug.rudolph@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-2021-0961; Project Identifier
MCAI-2021-00924-A'' 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
this 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
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 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 Doug
Rudolph, Aviation Safety Engineer, General Aviation & Rotorcraft
Section, International Validation Branch, FAA, 901 Locust, Room 301,
Kansas City, MO 64106. Any commentary that the FAA receives which is
not specifically designated as CBI will be placed in the public docket
for this rulemaking.

Background

The Civil Aviation Authority (CAA), which is the aviation authority
for the United Kingdom, has issued CAA AD G-2021-0005, dated August 3,
2021 (referred to after this as ``the MCAI''), to address an unsafe
condition on certain serial-numbered BAE Systems (Operations) Ltd Model
Jetstream Series 3100 and Series 3200 airplanes. The MCAI states:

On 8 October 2019, a Jetstream Series 3200 aircraft aborted
take-off at a speed of approximately 130 kt and veered off the
runway. The investigation into the serious incident concluded the
take-off was initiated with an engaged Gust Lock Mechanism,
resulting in a temporary loss of aircraft control. Damage was
identified in the Gust Lock mechanism, which allowed both power
levers to be moved beyond flight idle with the gust locks engaged.
The serious incident investigation determined that a bent
control rod within the gust lock system made it possible to move
both power levers simultaneously to the max position, even though
the gust locks were still engaged.
The gust-lock system is designed to lock and prevent damage to
the control surfaces when the aircraft is parked during gusting wind
conditions. The system contains a mechanical baulk which prevents
both power levers from being moved beyond the flight idle position
when the gust locks are engaged.
Three previous occurrences in which a bent control rod enabled
both power levers to be moved simultaneously beyond the flight idle
position while the gust lock system was engaged have been identified
by the Type Certificate Holder. Service Bulletin 27-JM 5350 was
first published in 1992 to introduce a stronger control rod.
This condition, if not prevented, could lead to partial or total
loss of aircraft control. To address this potential unsafe
condition, this [CAA] AD mandates the installation of a modified
push rod assembly.
BAE Systems operating manuals contain pre-flight checks that are
designed to ensure the gust locks are not engaged during take-off.
You may examine the MCAI in the AD docket at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-0961.

Related Service Information Under 1 CFR Part 51


The FAA reviewed Jetstream Series 3100/3200 Service Bulletin 27-
JM5350, Revision 1, dated May 6, 1994. This service information
specifies procedures for replacing push rod assembly part number (P/N)
137201E419 with push rod assembly P/N 137201E429. 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 ADDRESSES.

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 referenced above. The FAA is issuing this NPRM
after determining 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 accomplishing the actions specified
in the service information already described, except as discussed under
``Differences Between this Proposed AD and the MCAI.''

Differences Between This Proposed AD and the MCAI

The MCAI does not apply to the Model Jetstream Series 200, whereas
this proposed AD would include the Model Jetstream Series 200 because
this model has an FAA type certificate and shares a similar type design
in the affected area. The MCAI and service information apply to Model
Jetstream Series 3100 and Jetstream Series 3200 airplanes, which are
identified on the FAA type certificates as Jetstream Model 3101 and
Jetstream Model 3201 airplanes, respectively.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 43 airplanes of U.S. registry.
The FAA also estimates that it would take about 6 work-hours per
airplane to replace the push rod assembly. The average labor rate is
$85 per work-hour. Required parts would cost about $300 per airplane.
Based on these figures, the FAA estimates the cost of the proposed
AD on U.S. operators to be $34,830 or $810 per airplane.

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.

Sec. 39.13 [Amended]


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