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2017-13-11 GULFSTREAM AEROSPACE CORPORATION: Amendment 39-18941; Docket No. FAA-2016-9437; Directorate Identifier 2016-NM-131-AD.
(a) EFFECTIVE DATE

    This AD is effective August 3, 2017.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to  all Gulfstream Aerospace Corporation Model G-IV
    airplanes, certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 27, Flight controls.

(e) UNSAFE CONDITION

    This AD was prompted  by a report indicating  that the G-IV gust  lock
    system allows more throttle travel  than was intended and could  allow
    the throttle  to be  advanced to  reach take-off  thrust. The intended
    function  of  the  gust  lock system  is  to  restrict  throttle lever
    movement to a maximum of  6 degrees of forward travel,  which provides
    an unmistakable  warning to  the pilot  that the  gust lock  system is
    still  engaged,  prohibiting the  use  of the  primary  flight control
    surfaces.  We  are  issuing  this AD  to  prevent  the  throttle lever
    movement from advancing more than  6 degrees of forward travel,  which
    could result in  the aircraft reaching  near take-off thrust  and high
    velocities  without primary  flight controls  (aileron, elevator,  and
    rudder) and cause a failure  to rotate during take-off and  high speed
    runway overrun.

(f) COMPLIANCE

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

(g) MODIFICATION

    Within 36 months after the effective date of this AD, modify the  gust
    lock system by doing a  retrofit of the gust lock  throttle interlock,
    in accordance with the  Accomplishment Instructions of the  applicable
    service information specified in  paragraph (g)(1), (g)(2), or  (g)(3)
    of this AD.

(1) Gulfstream IV Customer Bulletin Number 236B, dated February 3, 2017.

(2) Gulfstream G300 Customer Bulletin Number 236B, dated February 3, 2017.

(3) Gulfstream G400 Customer Bulletin Number 236B, dated February 3, 2017.

(h) MAINTENANCE  OR  INSPECTION PROGRAM REVISION  TO INCLUDE  A FUNCTIONAL
    TEST

    Within  90  days after  the  effective date  of  this AD,  revise  the
    maintenance or  inspection program,  as applicable,  to incorporate  a
    functional test of the  throttle lever gust lock  protection specified
    in the  applicable temporary  revision (TR)  identified in  paragraphs
    (h)(1) through (h)(4) of this AD. The initial compliance time for  the
    functional test is within the applicable time specified in  paragraphs
    (h)(1)  through  (h)(4)  of  this AD,  or  within  90  days after  the
    effective date of this AD, whichever occurs later. The functional test
    must be  done in  accordance with  the applicable  service information
    specified in paragraphs (i)(1) through (i)(4) of this AD.

(1) For  Gulfstream IV  Maintenance Manual TR 5-7,  dated  April 29, 2016:
    Within 12 months or  4,500 flight hours,  whichever occurs first after
    accomplishing the modification required by paragraph (g) of this AD.

(2) For  Gulfstream IV  MSG-3 Maintenance Manual TR 5-6,  dated  April 29,
    2016: Before  the next  1C maintenance  check or  within 4,500  flight
    hours, whichever occurs first after accomplishing the modification re-
    quired by paragraph (g) of this AD.

(3) For  Gulfstream G300 Maintenance Manual TR 5-3,  dated April 29, 2016:
    Before the  next 1C  maintenance check  or within  4,500 flight hours,
    whichever  occurs first  after accomplishing the modification required
    by paragraph (g) of this AD.

(4) For  Gulfstream G400 Maintenance Manual TR 5-3,  dated April 29, 2016:
    Before the  next 1C  maintenance check  or within  4,500 flight hours,
    whichever occurs first  after accomplishing the  modification required
    by paragraph (g) of this AD.

(i) SERVICE INFORMATION FOR THE FUNCTIONAL TEST OF THE THROTTLE LEVER GUST
    LOCK PROTECTION

    The  functional  test  of  the  throttle  lever  gust  lock protection
    specified in paragraph (h) of this AD must be done in accordance  with
    the  applicable  service information  specified  in paragraphs  (i)(1)
    through (i)(4) of this AD.

(1) Gulfstream IV Maintenance Manual TR 27-3, dated April 29, 2016.

(2) Gulfstream IV MSG-3 Maintenance Manual TR 27-3, dated April 29, 2016.

(3) Gulfstream G300 Maintenance Manual TR 27-3, dated April 29, 2016.

(4) Gulfstream G400 Maintenance Manual TR 27-3, dated April 29, 2016.

(j) NO ALTERNATIVE ACTIONS AND INTERVALS

    After  the  maintenance  or inspection  program  has  been revised  as
    required by paragraph  (h) of this  AD, no alternative  actions (e.g.,
    inspections) or intervals may be used unless the actions or  intervals
    are  approved  as  an  alternative  method  of  compliance  (AMOC)  in
    accordance with the procedures specified in paragraph (m) of this AD.

(k) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for the actions required  by paragraph
    (g) of this AD, if  those actions were performed before  the effective
    date of this AD using the applicable service information identified in
    paragraph (k)(1), (k)(2), or (k)(3) of this AD.

(1) Gulfstream IV Customer Bulletin Number 236, dated June 1, 2016 or 236A
    dated August 8, 2016.

(2) Gulfstream G300 Customer Bulletin Number 236,  dated June 1, 2016;  or
    236A, dated August 8, 2016.

(3) Gulfstream G400 Customer Bulletin Number 236,  dated June 1, 2016;  or
    236A, dated August 8, 2016.

(l) EXCEPTION FOR REPORTING AND RETURN OF PARTS

    Although the service information  identified in paragraph (g)  of this
    AD specifies to submit certain information to the manufacturer and  to
    return  parts  to  the manufacturer,  this AD  does not  include those
    requirements.

(m) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, Atlanta Aircraft Certification Office (ACO), 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 ACO, send  it to the attention  of the
    person identified in paragraph (n)(1) of this AD.

(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.

(3) For  service  information  that  contains  steps  that  are labeled as
    Required for Compliance (RC),  the provisions  of paragraphs (m)(3)(i)
    and (m)(3)(ii) of this AD apply.

(i) The steps labeled as RC,  including substeps under an RC step  and any
    figures identified in an RC step, must be done to comply with the  AD.
    If a step or substep is  labeled "RC Exempt," then the RC  requirement
    is removed  from that  step or  substep. An  AMOC is  required for any
    deviations to RC steps, including substeps and identified figures.

(ii) Steps not labeled as RC may be deviated  from  using accepted methods
     in accordance with the  operator's maintenance or inspection  program
     without  obtaining  approval  of  an  AMOC,  provided  the  RC steps,
     including  substeps  and identified  figures,  can still  be  done as
     specified,  and  the  airplane  can  be  put  back  in  an  airworthy
     condition.

(n) RELATED INFORMATION

(1) For more information  about this AD,  contact  Gideon Jose,  Aerospace
    Engineer,  Systems and Equipment Branch,  ACE-119A,  FAA, Atlanta ACO,
    1701 Columbia Avenue,  College Park,  GA 30337;  phone:  404-474-5569;
    fax: 404-474-5606; email: gideon.jose@faa.gov.

(2) Service information  identified in this AD that is not incorporated by
    reference is available at the addresses specified in paragraphs (o)(3)
    and (o)(4) of this AD.

(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 the AD specifies otherwise.

(i) Gulfstream G300 Customer Bulletin Number 236B, dated February 3, 2017.

(ii) Gulfstream  G300  Maintenance Manual  Temporary Revision 27-3,  dated
     April 29, 2016.

(iii) Gulfstream  G300  Maintenance Manual  Temporary Revision 5-3,  dated
      April 29, 2016.

(iv) Gulfstream G400 Customer Bulletin Number 236B dated February 3, 2017.

(v) Gulfstream G400 Maintenance Manual Temporary Revision 27-3 dated April
    29, 2016.

(vi) Gulfstream G400 Maintenance Manual Temporary Revision 5-3 dated April
     29, 2016.

(vii) Gulfstream IV Customer Bulletin Number 236B, dated February 3, 2017.

(viii) Gulfstream IV  Maintenance  Manual  Temporary Revision 27-3,  dated
       April 29, 2016.

(ix) Gulfstream IV Maintenance Manual Temporary Revision 5-7,  dated April
     29, 2016.

(x) Gulfstream IV MSG-3 Maintenance Manual Temporary Revision 27-3,  dated
    April 29, 2016.

(xi) Gulfstream IV MSG-3 Maintenance Manual Temporary Revision 5-6,  dated
     April 29, 2016.

(3) For  service information  identified  in this AD,  contact  Gulfstream
    Aerospace  Corporation,  Technical Publications Dept.,  P.O. Box 2206,
    Savannah, GA 31402-2206;  telephone 800-810-4853; fax 912-965-3520; e-
    mail pubs@gulfstream.com;  Internet http://www.gulfstream.com/product_
    support/technical_pubs/pubs/index.htm.

(4) You may view this service information at the FAA,  Transport  Airplane
    Directorate, 1601 Lind Avenue SW., Renton, WA. For information on  the
    availability of this material at the FAA, call 425-227-1221.

(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, call 202
    -741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-
    locations.html.

Issued in Renton, Washington,  on June 16, 2017. Michael Kaszycki,  Acting
Manager, Transport Airplane Directorate, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Gideon Jose, Aerospace Engineer,  Systems
and Equipment Branch, ACE-119A, FAA, Atlanta Aircraft Certification Office
(ACO), 1701 Columbia Avenue, College Park, GA 30337; phone:  404-474-5569;
fax: 404-474-5606; email: gideon.jose@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-9437; Directorate Identifier 2016-NM-131-AD;
Amendment 39-18941; AD 2017-13-11]
RIN 2120-AA64

Airworthiness Directives; Gulfstream Aerospace Corporation
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for all
Model G-IV airplanes. This AD was prompted by a report indicating that
the G-IV gust lock system allows more throttle travel than was intended
and could allow the throttle to be advanced to reach take-off thrust.
This AD requires modification of the gust lock system, and a revision
of the maintenance or inspection program to incorporate functional
tests. We are issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective August 3, 2017.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of August 3,
2017.

ADDRESSES: For service information identified in this final rule,
contact Gulfstream Aerospace Corporation, Technical Publications Dept.,
P.O. Box 2206, Savannah, GA 31402-2206; telephone 800-810-4853; fax
912-965-3520; email pubs@gulfstream.com; Internet http://www.gulfstream.com/product_support/technical_pubs/pubs/index.htm. You
may view this referenced service information at the FAA, Transport
Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information
on the availability of this material at the FAA, call 425-227-1221. It
is also available on the Internet at http://www.regulations.gov by
searching for and locating Docket No. FAA-2016-9437.

Examining the AD Docket

You may examine the AD docket on the Internet at http://www.regulations.gov
by searching for and locating Docket No. FAA-2016-9437;
or in person at the Docket Management Facility between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays. The AD docket
contains this AD, the regulatory evaluation, any comments received, and
other information. The address for the Docket Office (phone: 800-647-
5527) is Docket Management Facility, U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Gideon Jose, Aerospace Engineer,
Systems and Equipment Branch, ACE-119A, FAA, Atlanta Aircraft
Certification Office (ACO), 1701 Columbia Avenue, College Park, GA
30337; phone: 404-474-5569; fax: 404-474-5606; email:
gideon.jose@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 by adding an AD that would apply to all Gulfstream Aerospace
Corporation Model G-IV airplanes. The NPRM published in the Federal
Register on December 12, 2016 (81 FR 89397) (``the NPRM''). The NPRM
was prompted by a report indicating that the G-IV gust lock system
allows more throttle travel than was intended and could allow the
throttle to be advanced to reach take-off thrust. The intended function
of the gust lock system is to restrict throttle lever movement to a
maximum of 6 degrees of forward travel, which provides an unmistakable
warning to the pilot that the gust lock system is still engaged,
prohibiting the use of the primary flight control surfaces. The NPRM
proposed to require modification of the gust lock system, and a
revision of the maintenance or inspection program to incorporate
functional tests. We are issuing this AD to prevent the throttle lever
movement from advancing more than 6 degrees of forward travel, which
could result in the aircraft reaching near take-off thrust and high
velocities without primary flight controls (aileron, elevator, and rudder)
and cause a failure to rotate during take-off and high speed runway overrun.

Comments

We gave the public the opportunity to participate in developing
this AD. We have considered the comment received. The commenter, the
National Transportation Safety Board (NTSB), supported the NPRM.

New Service Information

Since we issued the NPRM, we received the following customer
bulletins that clarify the modification instructions, and we have
revised paragraph (g) of this AD to refer to these bulletins:
Gulfstream IV Customer Bulletin Number 236B, dated
February 3, 2017;
Gulfstream G300 Customer Bulletin Number 236B, dated
February 3, 2017; and
Gulfstream G400 Customer Bulletin Number 236B, dated
February 3, 2017.
We have also added the following customer bulletins to paragraph
(k) of this AD to provide credit for the actions required by paragraph
(g) of this AD if those actions were performed before the effective
date of this AD:
Gulfstream IV Customer Bulletin Number 236A, dated August
8, 2016;
Gulfstream G300 Customer Bulletin Number 236A, dated
August 8, 2016; and
Gulfstream G400 Customer Bulletin Number 236A, dated
August 8, 2016.

Conclusion

We reviewed the relevant data, considered the comment received, and
determined that air safety and the public interest require adopting
this AD with the changes described previously and minor editorial
changes. We have determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM for correcting the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
We also determined that these changes will not increase the
economic burden on any operator or increase the scope of this AD.

Related Service Information Under 1 CFR Part 51

We reviewed the following customer bulletins:
Gulfstream IV Customer Bulletin Number 236B, dated
February 3, 2017;
Gulfstream G300 Customer Bulletin Number 236B, dated
February 3, 2017; and
Gulfstream G400 Customer Bulletin Number 236B, dated
February 3, 2017.
The service information describes procedures for modifying the gust
lock system by doing a retrofit of the gust lock throttle interlock.
These documents are distinct since they apply to different airplane
models in different configurations.
We also reviewed the following temporary revisions (TRs):
Gulfstream IV Maintenance Manual TR 27-3, dated April 29,
2016;
Gulfstream IV MSG-3 Maintenance Manual TR 27-3, dated
April 29, 2016;
Gulfstream G300 Maintenance Manual TR 27-3, dated April
29, 2016; and
Gulfstream G400 Maintenance Manual TR 27-3, dated April
29, 2016.
The service information describes procedures for a functional test
of the throttle lever gust lock protection. These documents are
distinct since they apply to different airplane models in different
configurations.
We also reviewed the following temporary revisions:
Gulfstream IV Maintenance Manual TR 5-7, dated April 29,
2016;
Gulfstream IV MSG-3 Maintenance Manual TR 5-6, dated April
29, 2016;
Gulfstream G300 Maintenance Manual TR 5-3, dated April 29,
2016; and
Gulfstream G400 Maintenance Manual TR 5-3, dated April 29,
2016.
The service information describes an airworthiness limitation
(certification maintenance requirement) task to do functional tests of
the throttle lever gust lock protection. These documents are distinct
since they apply to different airplane models in different
configurations.
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.

Costs of Compliance

We estimate that this AD affects 425 airplanes of U.S. registry. We
estimate the following costs to comply with this AD:

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Modification and Maintenance or Inspection Program Revision 109 work-hours x $85 per hour = $9,265 $9,080 $18,345 $7,796,625

According to the manufacturer, some of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
individuals. We do not control warranty coverage for affected
individuals. As a result, we have included all costs in our cost
estimate.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: ``General
requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.

Regulatory Findings

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 above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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.

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

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):