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PROPOSED AD AEROSTAR AIRCRAFT CORPORATION: Docket No. FAA-2020-0574; Product Identifier 2019-CE-015-AD. 
(a) COMMENTS DUE DATE

    The FAA must receive comments by August 10, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  Aerostar Aircraft  Corporation Model  PA-60- 601P
    (Aerostar 601P), PA-60-602P (Aerostar 602P), and PA-60-700P  (Aerostar
    700P) airplanes, all serial numbers, certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 27; Flight Controls.

(e) UNSAFE CONDITION

    This  AD was  prompted by  reports of  corrosion on  the elevator  and
    aileron balance tubes. The FAA is issuing this AD to detect  corrosion
    on the elevator  and aileron balance  tubes. The unsafe  condition, if
    not addressed,  could result  in failure  of the  aileron and elevator
    balance tubes, jamming of  the aileron and/or elevator  balance tubes,
    and loss of control of the airplane.

(f) COMPLIANCE

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

(g) REPETITIVE INSPECTIONS

    Within 10 hours time-in-service after  the effective date of this  AD,
    inspect the elevator and aileron balance tubes for corrosion  (pitting
    and flaking) and rust (discoloration) by following steps 1. through 3.
    of  Part  I  (Inspection) of  the  Instructions  in Aerostar  Aircraft
    Corporation  Service  Bulletin   SB600-138,  dated  August   30,  2018
    (Aerostar SB600-138). For each tube replaced as required by  paragraph
    (h) of  this AD,  using a  borescope, repeat  the inspection within 10
    years after replacing the tube and thereafter as follows:

(1) At intervals not to exceed 10 years as long as no rust is found.

(2) At intervals not to exceed 2 years if only rust is found (without  any
    signs of corrosion).

(h) REPLACEMENTS

    At the following compliance  times, replace each elevator  and aileron
    balance tube by following Part II (Replacement) of the Instructions in
    Aerostar SB600-138, except you are not required to report  information
    to the manufacturer:

(1) Before further flight if corrosion or rust is found (inside or outside
    the tubes) during the initial inspection required by paragraph (g)  of
    this AD.

(2) At  the next  100-hour inspection  or at  the next  annual inspection,
    whichever occurs first, if no  corrosion and no rust is  found (inside
    or  outside  the  tubes) during  the  initial  inspection required  by
    paragraph (g) of this AD.

(3) Before  further flight  if corrosion  is found  (inside or outside the
    tubes) during any repetitive  inspection required by paragraph  (g) of
    this AD.

(i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The  Manager, Seattle  ACO Branch,  FAA, has  the authority to approve
    AMOCs for this AD, if requested  using the procedures found in 14  CFR
    39.19. In  accordance with  14 CFR  39.19, send  your request  to your
    principal  inspector or  local Flight  Standards District  Office,  as
    appropriate. If  sending information  directly to  the manager  of the
    certification  office,  send  it  to  the  attention  of  the   person
    identified in paragraph (j)(1) of this AD. Information may be  emailed
    to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.

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

(j) RELATED INFORMATION

(1) For more  information about this  AD, contact David  Herron, Aerospace
    Engineer, Seattle ACO  Branch, FAA, 2200  S 216th St.,  Des Moines, WA
    98198; phone: (206) 231-3544; email: david.herron@faa.gov.

(2) For service information  identified in this AD, contact  Aerostar Air-
    craft  Corporation, 2265  West Aerostar  Way, Hayden  Lake, ID  83835;
    telephone:   (208)   762-0338;   fax:   (208)   762-8349;    internet:
    https://aerostaraircraft.com. You may view this service information at
    the FAA,  You may  review this  referenced service  information at the
    FAA, Airworthiness  Products Section,  Operational Safety  Branch, 901
    Locust,  Kansas   City,  Missouri   64106.  For   information  on  the
    availability of this material at the FAA, call (816) 329-4148.

Issued  on  June 17, 2020. Lance T.  Gant, Director, Compliance  & Airwor-
thiness Division, Aircraft Certification Service.

DATES: The FAA  must receive comments  on this proposed  AD by August  10,
2020.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0574; Product Identifier 2019-CE-015-AD]
RIN 2120-AA64

Airworthiness Directives; Aerostar Aircraft Corporation 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 all Aerostar Aircraft Corporation Model PA-60-601P (Aerostar 601P),
PA-60-602P (Aerostar 602P), and PA-60-700P (Aerostar 700P) airplanes.
This proposed AD was prompted by reports of corrosion on the elevator
and aileron balance tubes. This proposed AD would require repetitively
inspecting the elevator and aileron balance tubes for corrosion and
rust and replacing the tube. The FAA is issuing this proposed AD to
address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by August 10, 2020.

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 Aerostar
Aircraft Corporation, 2265 West Aerostar Way, Hayden Lake, ID 83835;
telephone: (208) 762-0338; fax: (208) 762-8349; internet:
https://aerostaraircraft.com. You may view this service information at the FAA,

You may review this referenced service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 901 Locust,
Kansas City, Missouri 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 on the internet at https://www.regulations.gov
by searching for and locating Docket No. FAA-2020-
0574; 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, any comments received, and other information. The street
address for Docket Operations is listed above. Comments will be
available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: David Herron, Aerospace Engineer,
Seattle ACO Branch, FAA, 2200 S 216th St, Des Moines, WA 98198; phone:
(206) 231-3544; email: david.herron@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 the ADDRESSES section. Include "Docket No. FAA-2020-0574;
Product Identifier 2019-CE-015-AD" at the beginning of your comments.
The FAA specifically invites comments on the overall regulatory,
economic, environmental, and energy aspects of this NPRM. The FAA will
consider all comments received by the closing date and may amend this
NPRM because of those comments.

The FAA will post all comments received, without change, to
https://www.regulations.gov, including any personal information you provide.
The FAA will also post a report summarizing each substantive verbal
contact received about this NPRM.

Discussion

The FAA received reports of corrosion on the elevator and aileron
balance tubes. Aerostar Aircraft Corporation (Aerostar) reported that,
during repair of a Model PA-60-601P airplane, corrosion was found on
the balance tubes used in the elevator and aileron systems. Corrosion
on balance tubes in the elevator and aileron system may be hidden by
rubber boots. These balance tubes counteract the effects of cabin
pressurization. The majority of the Aerostar PA-60 airplane fleet have
pressurized cabins. After the finding on the first airplane, Aerostar
inspected four additional airplanes in the PA-60 fleet. Aerostar
reported four out of these five airplanes had corrosion on both the
aileron and elevator balance tubes. This condition, if not addressed,
could result in failure of the aileron and elevator balance tubes. This
failure could cause the aileron and/or elevator balance tubes to jam
and result in loss of control of the airplane.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Aerostar Service Bulletin SB600-138, dated August
30, 2018. The service bulletin contains procedures for repetitively
inspecting the elevator and aileron balance tubes for corrosion and
rust and replacing the tubes at a specified time and repetitively if
necessary. This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in the ADDRESSES section.

FAA's Determination

The FAA is proposing this AD because it evaluated all relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

This proposed AD would require accomplishing the actions specified
in the service information described previously.

Differences Between This Proposed AD and the Service Information

This proposed AD would not require completing the reply card and
returning it to Aerostar as specified in Step 13 of Part II of the
service information.

Costs of Compliance

The FAA estimates that this proposed AD affects 404 airplanes of
U.S. registry.

The FAA estimates the following costs to comply with this proposed AD:

Estimated Costs

ACTION
LABOR COST
PARTS COST
COST PER PRODUCT
COST ON U.S. OPERATORS
Inspect elevator and aileron balance tubes. 1 work-hour x $85 per hour = $85 per inspection cycle. Not Applicable $85 per inspection cycle. $34,340 per inspection cycle.
Replace elevator and aileron balance tubes. 8 work-hours x $85 per hour = $680. $1,187 $1,867 $754,268.

The FAA estimates the following costs to do any necessary
replacements that would be required based on the results of the
proposed repetitive inspections, assuming separate replacement
intervals. The FAA has no way of determining the number of airplanes
that might need these replacements:

On-Condition Costs

ACTION
LABOR COST
PARTS COST
COST PER PRODUCT
Replace elevator balance tube 8 work-hours x $85 per hour = $680.
$594
$1,274
Replace aileron balance tube 8 work-hours x $85 per hour = $680.
594
1,274

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) Will not affect intrastate aviation in Alaska, 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.

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 (AD):