(a) EFFECTIVE DATE

    This AD is effective May 3, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

(1) This AD  applies to the following Textron Aviation Inc. airplanes; all
    serial numbers, that are certificated in any category:

(i) Models A36TC and B36TC airplanes equipped with a turbocharged engine.

(ii) Models  S35,  V35,  V35A,  and  V35B  airplanes  equipped   with  the
     Continental TSIO-520-D engine  with  AiResearch  turbocharger  during
     manufacture; and

(iii) Models S35, V35, V35A, and V35B airplanes equipped with StandardAero
      Supplemental Type Certificate (STC) SA1035WE.

(2) If the one-piece v-band coupling (clamp), part number (P/N) NH1000897-
    40,  is installed  on Textron Aviation Inc. Models S35, V35, V35A, and
    V35B airplanes equipped  with  the  Continental TSIO-520-D engine with
    AiResearch turbocharger during manufacture,  this AD does not apply to
    those airplanes.

(d) SUBJECT

    Joint Aircraft System Component (JASC)/Air Transport Association (ATA)
    of America Code 81, Turbocharging.

(e) UNSAFE CONDITION

    This AD was prompted  by  a  fatal accident where the exhaust tailpipe
    fell off during takeoff. We are issuing this AD to prevent failure  of
    the  exhaust  tailpipe  v-band  coupling  (clamp)  that  may  lead  to
    detachment of  the exhaust  tailpipe from  the turbocharger  and allow
    high-temperature exhaust gases to enter the engine compartment,  which
    could result in an inflight fire.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.  For the purposes of this AD,  the exhaust tailpipe v-band
    coupling may also be referred to as the exhaust tailpipe v-band clamp.

(g) REVIEW OF THE MAINTENANCE RECORDS

    Within 50 hours time-in-service (TIS) after May 3, 2018 (the effective
    date of  this AD),  do a  maintenance records  review to determine the
    hours  TIS  of the  exhaust  tailpipe v-band  coupling.  If unable  to
    determine the hours TIS of  the exhaust tailpipe v-band coupling,  use
    the compliance time specified in paragraph (h)(2) of this AD.

(h) COMPLIANCE TIMES FOR REPETITIVE REPLACEMENT OF THE V-BAND COUPLING

    Use the following compliance times in paragraph (h)(1)  or (2) of this
    AD for the repetitive replacement of the exhaust tailpipe v-band coup-
    ling as specified in paragraph (i) of this AD.

(1) If from a review of the maintenance records you can positively identi-
    fy that the hours TIS for the exhaust tailpipe v-band coupling is less
    than 500 hours TIS: Do the initial replacement within 500 hours TIS on
    the exhaust tailpipe v-band coupling  or within the next 50  hours TIS
    after May 3,  2018 (the effective  date of this  AD), whichever occurs
    later, and replace repetitively thereafter at intervals not to  exceed
    500 hours TIS on the exhaust tailpipe v-band coupling.

(2) If from a review of the maintenance records you can positively identi-
    fy that the hours TIS for the exhaust tailpipe v-band coupling is  500
    hours TIS or more or you cannot positively identify the hours TIS  for
    the  exhaust  tailpipe  v-band coupling:  Do  the  initial replacement
    within 50 hours TIS after May 3, 2018 (the effective date of this  AD)
    and replace  repetitively thereafter  at intervals  not to  exceed 500
    hours TIS on the exhaust tailpipe v-band coupling.

(i) REPLACEMENT OF THE EXHAUST TAILPIPE V-BAND COUPLING

    Replace  the exhaust  tailpipe v-band  coupling for  the airplanes  in
    paragraphs (i)(1) and (2) of this AD at the applicable compliance time
    as specified in paragraph (h) of this AD.

Note 1 to the introductory text of paragraph (i) of this AD:  We recommend
after installation of the exhaust tailpipe v-band coupling,  you do an en-
gine run and recheck the torque of the v-band coupling.

(1) Models A36TC and B36TC airplanes:  Replace the exhaust tailpipe v-band
    coupling part number (P/N) N4211-375-M  or  P/N 5322C-375-Z with a new
    exhaust tailpipe v-band coupling. When installing the new part, tight-
    en the v-band coupling to 40 in-lbs., tap the periphery of the band to
    distribute tension, and torque again to 40 in-lbs.

Note 2 to paragraph (i)(1) of this AD: P/Ns N4211-375-M and P/N 5322C-375-
Z are also known as  P/N N4211-375M  and  P/N 5322C3752.  The  engineering
drawings list the applicable part number v-band couplings as P/N N4211-375
-M and P/N 5322C-375-Z; however, the parts catalog lists the applicable v-
band couplings as P/N N4211-375M and P/N 5322C3752.

(2) For  Models S35, V35, V35A, and V35B airplanes,  as specified in para-
    graphs (i)(2)(i) and (ii) of this AD:

(i) For  airplanes  equipped  with  the Continental TSIO-520-D engine with
    AiResearch turbocharger during manufacture:  Replace the exhaust tail-
    pipe v-band coupling P/N U4211-375-M  or P/N 4404C375-M with a new ex-
    haust tailpipe v-band coupling. When installing a new P/N U4211-375-M,
    tighten the v-band coupling to 60 in-lbs.,  tap  the  periphery of the
    band to distribute tension,  and  torque again to 60 in-lbs.  When in-
    stalling a new P/N 4404C375-M,  add 20 in-lbs after the running torque
    is overcome. Replacement of exhaust tailpipe v-band coupling P/N U4211
    -375-M  or  P/N 4404C375-M  with  the  one-piece v-band coupling,  P/N
    NH1000897-40, terminates the requirements of this AD.

Note 3 to paragraph (i)(2)(i) and  (ii) of this AD:  P/Ns  U4211-375-M and
4404C375-M may also be known as P/Ns U4211-375M and 4404C375M or 4404C-375
-M.

(ii) For  airplanes equipped with STC SA1035WE:  Replace the exhaust tail-
     pipe v-band coupling P/N U4211-375-M  with  a new exhaust tailpipe v-
     band coupling. When installing the new part, tighten the v-band coup-
     ling to 60 in-lbs.,  tap the periphery of the band to distribute ten-
     sion, and torque again to 60 in-lbs.

(j) REPETITIVE VISUAL INSPECTION OF THE INSTALLED  EXHAUST TAILPIPE V-BAND
    COUPLING

(1) If you remove the exhaust tailpipe v-band coupling  during your annual
    inspection or within the compliance time specified in paragraph (j)(2)
    of this AD, you  may do the inspection  specified in paragraph (k)  of
    this AD in lieu  of the inspection required  in paragraph (j) of  this
    AD.  If  you  already  have the  v-band  coupling  removed,  doing the
    detailed  inspection  as  specified  in  paragraph  (k)  of  this   AD
    eliminates the  possibility of  having to  remove and  reinstall the v
    -band coupling more than once  if certain conditions are found  during
    the inspection required in paragraph (j) of this AD.

(2) At the next annual inspection after May 3, 2018 (the effective date of
    this AD) or within the next 12 months after May 3, 2018 (the effective
    date of this AD), whichever occurs later, and repetitively  thereafter
    at intervals not to  exceed 12 months, do  a visual inspection of  the
    installed exhaust tailpipe v-band  coupling.  Use the inspection steps
    listed in paragraphs (j)(2)(i) through (vii) of this AD.

(i) Inspect the coupling and area around the coupling for signs of exhaust
    stains, sooting, or other evidence of exhaust leakage. If any of those
    conditions  are  found,  remove the coupling and  go to the inspection
    steps in paragraph (k) of this AD  for inspection of a v-band coupling
    that has been removed.

(ii) Inspect the coupling outer band for cracks,  paying particular atten-
     tion to  the spot  weld areas.  If cracks  are found,  before further
     flight,  you  must replace  the  v-band coupling  with  a new  v-band
     coupling and restart the hours TIS for the repetitive replacement  of
     the v-band coupling.

(iii) Inspect the coupling for looseness  or  separation of the outer band
      to the  v-retainer segments(s)  at all  spot welds.  If looseness or
      separation of the outer band to any or multiple retainer segments(s)
      is  found,  before  further  flight,  you  must  replace  the v-band
      coupling with a  new v-band coupling  and restart the  hours TIS for
      the repetitive replacement of the v-band coupling.

(iv) Inspect the coupling outer band for cupping, bowing, or crowning.  If
     any of these conditions are found, before further flight,  remove the
     coupling  and  go to the inspection steps in paragraph (k) of this AD
     for inspection of a v-band coupling that has been removed.

(v) Inspect the area of the coupling,  including the outer band,  opposite
    the t-bolt for damage or distortion.  If  any  damage or distortion is
    found,  before  further  flight,  you must replace the v-band coupling
    with a new v-band coupling  and  restart the hours TIS for the repeti-
    tive replacement of the v-band coupling.

(vi) Using a mirror, verify there is a space between each v-retainer coup-
     ling segment below the t-bolt.  If there is no space  between each v-
     retainer coupling segment below the t-bolt,  before  further  flight,
     you must replace  the v-band coupling  with a new v-band coupling and
     restart the hours TIS for the repetitive replacement  of  the  v-band
     coupling.

(vii) Verify the v-band coupling nut  is  properly torqued as specified in
      paragraphs (j)(2)(vii)(A) through (C) of this AD:

(A) For P/N N4211-375-M  or  P/N 5322C-375-Z exhaust tailpipe v-band coup-
    ling, torque to 40 in-lbs.

(B) For P/N U4211-375-M exhaust tailpipe v-band coupling, torque to 60 in-
    lbs.

(C) For 4404C375-M exhaust tailpipe v-band coupling,  verify  the  nut  is
    secure. If not secure,  before further flight,  loosen and verify run-
    ning torque and add 20 in-lbs to the running torque when tightened.

(3) These inspections  do  not  terminate  the 500-hour TIS repetitive re-
    placement of the v-band coupling and  do not restart the hours TIS for
    the repetitive replacement of the v-band coupling.

(k) VISUAL INSPECTION OF A REMOVED EXHAUST TAILPIPE V-BAND COUPLING

(1) If during the visual inspection required  in paragraph (j)  of this AD
    you are required to remove of the exhaust tailpipe v-band coupling  to
    do a more detailed inspection, you must do the inspection steps listed
    in paragraphs (k)(1) and  (2) of this AD.  If you removed the  exhaust
    tailpipe v-band coupling  during the annual  inspection or within  the
    compliance time specified in paragraph  (j)(2) of this AD, you  may do
    the inspection specified in  paragraph (k) of this  AD in lieu of  the
    inspection required in paragraph (j)  of this AD. If you  already have
    the  v-band  coupling  removed,  doing  the  detailed  inspection   as
    specified in paragraph  (k) of this  AD eliminates the  possibility of
    having to remove and reinstall  the v-band coupling more than  once if
    certain  conditions  are  found  during  the  inspection  required  in
    paragraph (j) of this AD.

(i) Use crocus cloth and mineral spirits/Stoddard solvent,  to  clean  the
    outer band  of the  v-band coupling.  Pay particular  attention to the
    spot weld areas on the  coupling. If during cleaning corrosion  cannot
    be removed  or pitting  of the  v-band coupling  is found,  do not  re
    -install the v-band coupling.  Before further flight, you must install
    a new  v-band coupling  and restart  the hours  TIS for the repetitive
    replacement of the v-band coupling.

(ii) Use  a  10x magnifier to visually inspect the outer band  for cracks,
     paying particular attention  to the spot weld areas.  If  cracks  are
     found during this inspection,  do not re-install the v-band coupling.
     Before further flight, you must install a new v-band coupling and re-
     start the  hours TIS  for the  repetitive replacement  of the  v-band
     coupling.

(iii) Visually inspect  the flatness of the outer band  using  a  straight
      edge.  Lay the straight edge across the width of the outer band. The
      gap must be less than 0.062 inches.  See figure 1  to paragraphs (k)
      (1)(iii) and (v) of this AD. If the gap exceeds 0.062 inches between
      the outer band and the straight edge,  do not re-install  the v-band
      coupling. Before further flight, you must install a new v-band coup-
      ling and restart the hours TIS for the repetitive replacement of the
      v-band coupling.

                        ILLUSTRATION (Figure 1)

(iv) With the  t-bolt  in the 12 o'clock position,  visually  inspect  the
     coupling  for  the  attachment of  the outer  band to  the v-retainer
     coupling segments by inspecting for  gaps between the outer band  and
     the v-retainer coupling segments between approximately the 1  o'clock
     through 11 o'clock position. It is recommended to use backlighting to
     see gaps. If gaps between the outer band and the v-retainer  coupling
     segments are  found, do  not re-install  the v-band  coupling. Before
     further flight, you  must install a  new v-band coupling  and restart
     the hours TIS for the repetitive replacement of the v-band coupling.

(v) Visually  inspect  the  bend radii of the coupling v-retainer coupling
    segments for cracks.  Inspect the radii  throughout the length  of the
    segment. See figure 1 to paragraphs (k)(1)(iii) and (v) of this AD. If
    any cracks are  found, do not  re-install the v-band  coupling. Before
    further flight, you must install a new v-band coupling and restart the
    hours TIS for the repetitive replacement of the v-band coupling.

(vi) Visually  inspect  the  outer  band  opposite  the  t-bolt for damage
     (distortion, creases, bulging, or  cracks), which may be  caused from
     excessive  spreading  of  the  coupling  during  installation  and/or
     removal.  If  any  damage  is found,  do  not  re-install  the v-band
     coupling.  Before  further  flight, you  must  install  a new  v-band
     coupling and restart the hours TIS for the repetitive replacement  of
     the v-band coupling.

(2) If the removed exhaust tailpipe v-band coupling passes  all of the in-
    spection steps listed in paragraphs (k)(1)(i) through (vi) of this AD,
    you may re-install the same v-band coupling. After the coupling is  re
    -installed  and  torqued as  specified  in Replacement  of  the V-Band
    Coupling, paragraph (i) of this AD, verify there is space between each
    v-retainer coupling  segment below  the t-bolt.  If there  is no space
    between  each v-retainer  coupling segment  below the  t-bolt,  before
    further flight, you must install a new v-band coupling and restart the
    hours TIS for the repetitive replacement of the v-band coupling.

(3) The inspections required in paragraphs (k)(1) and (2)  of this AD only
    apply to re-installing the same exhaust tailpipe v-band coupling  that
    was removed  as specified  in paragraph  (j) of  this AD.  It does not
    apply to installation of a  new v-band coupling. These inspections  do
    not terminate the  500-hour TIS repetitive  replacement of the  v-band
    coupling  and  do  not  restart  the  hours  TIS  for  the  repetitive
    replacement of the v-band coupling.

(4) As of May 3, 2018 (the effective date of this AD),  do  not  install a
    used exhaust tailpipe v-band coupling  on the airplane except for  the
    reinstallation of the inspected exhaust tailpipe v-band coupling  that
    was removed as specified in paragraphs (j) and (k) of this AD.

(l) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The  Manager,  Wichita ACO Branch,  FAA,  has the authority to approve
    AMOCs for this AD,  if requested using the procedures found  in 14 CFR
    39.19.  The Manager,  Chicago ACO Branch,  FAA,  has  the authority to
    approve  AMOCs  concerning  STC SA1035WE,  if requested using the pro-
    cedures 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 Wichita ACO Branch, send it to the attention of the
    person identified in paragraph (m) of this AD.  If sending information
    directly to the manager  of the Chicago ACO Branch,  send  it  to  the
    attention of John Tallarovic,  Aerospace Engineer, AIR-7C3 Chicago ACO
    Branch, 2300 East Devon Avenue, Des Plaines, IL 60018-4696; telephone:
    (847) 294-8180; fax: (847) 294-7834; email: john.m.tallarovic@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.

(m) RELATED INFORMATION

    For more information about this AD,  contact Thomas Teplik,  Aerospace
    Engineer, Wichita ACO Branch, FAA, 1801 Airport Rd, Room 100, Wichita,
    Kansas 67209;  phone (316) 946-4196; fax (316) 946-4107; email thomas.
    teplik@faa.gov.

(n) MATERIAL INCORPORATED BY REFERENCE

    None.

Issued  in  Kansas City, Missouri,  on March 20, 2018.  Melvin J. Johnson,
Deputy Director, Policy & Innovation Division, Aircraft Certification Ser-
vice.

FOR FURTHER INFORMATION CONTACT: Thomas Teplik,Aerospace Engineer, Wichita
ACO Branch, FAA, 1801 Airport Road, Room 100, Wichita, Kansas 67209; phone
(316) 946-4196; fax: (316) 946-4107; email: thomas.teplik@faa.gov.