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ADs updated daily at www.Tdata.com
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| 2021-13-01 |
LEONARDO S.P.A. (TYPE CERTIFICATES PREVIOUSLY HELD BY
AGUSTA S.P.A. AND AGUSTAWESTLAND S.P.A.): Amendment 39-21606; Docket No. FAA-2021-0304; Project Identifier 2017-SW-108-AD. |
(a) EFFECTIVE DATE
This airworthiness directive (AD) is effective August 3, 2021.
(b) AFFECTED ADS
None.
(c) APPLICABILITY
This AD applies to Leonardo S.p.a. (Type Certificate previously held
by Agusta S.p.A.) Model AB139 and AW139 helicopters and Leonardo
S.p.a. (Type Certificate previously held by AgustaWestland S.p.A.)
Model AW189 helicopters, certificated in any category, with a main
rotor (M/R) slip ring part number (P/N) 4G6220V00151 with a serial
number (S/N) up to and including S/N 0141, except those marked with an
"L" following the S/N, installed.
(d) SUBJECT
Joint Aircraft Service Component (JASC) Code: 6200, Main Rotor System.
(e) UNSAFE CONDITION
This AD was prompted by reports of missing lock wire and loose fasten-
ers. The FAA is issuing this AD to address failure of an M/R slip ring
fastener. The unsafe condition, if not addressed, could result in
failure of the M/R slip ring bearing inner race, reduced M/R control,
and subsequent loss of control of the helicopter.
(f) COMPLIANCE
Comply with this AD within the compliance times specified, unless al-
ready done.
(g) REQUIRED ACTIONS
(1) For an M/R slip ring that has accumulated 900 or more total hours time
-in-service (TIS), within 50 hours TIS after the effective date of
this AD; and for an M/R slip ring that has accumulated less than 900
total hours TIS, within 300 hours TIS after the effective date of this
AD or before accumulating 950 total hours TIS, whichever occurs first:
(i) With the M/R slip ring removed, visually inspect for the presence of
each screw, the presence of any ferrule ended safety cable, the
correct installation of lock wire 0.20 CRES NAS 33540 P/N MS20995C20
(double-twist lock wire), and any missing double-twist lock wire for
each set of upper (connecter) end and lower (pigtail or standpipe) end
fasteners of the M/R slip ring as depicted in Figures 1 and 2 of Annex
A to Leonardo Helicopters Alert Service Bulletin (ASB) No. 139-472,
dated May 9, 2017 (ASB 139-472), or Leonardo Helicopters ASB No. 189
-138, dated May 12, 2017 (ASB 189-138), as applicable to your model
helicopter. Figures 2 and 3 of Annex A to ASB 139-472 and ASB 189-138
also show examples of a ferrule ended safety cable installed that are
not approved.
Note 1 to paragraph (g)(1)(i): Annex A to ASB 139-472 and ASB 189-138 is
Moog Service Bulletin SB 16-01, Revision 5, undated.
(ii) If all of the screws are present, there is not any ferrule ended
safety cable installed, the double-twist lock wire is correctly in-
stalled, and none of the double-twist lock wire is missing on each
set of upper end and lower end fasteners of the M/R slip ring, before
further flight, mark the letter "L" following the S/N on the
identification label by following the Compliance Instructions,
paragraph 3) of Annex A to ASB 139-472 or ASB 189-138, as applicable
to your model helicopter.
(iii) If a screw is missing from the inner diameter (the connector flange)
of the upper end of the M/R slip ring, before further flight, remove
the M/R slip ring from service.
(iv) If a screw is missing from the outer diameter of the upper end, from
the inner diameter of the lower end (shaft extension attachment
area), or from the outer diameter of the lower end, before further
flight, install a new screw and washer, apply a torque to 1-1.25 Nm,
and install double-twist lock wire by following the Compliance
Instructions, paragraphs 9)a) through g) of Annex A to ASB 139-472 or
ASB 189-138, as applicable to your model helicopter.
(v) If any double-twist lock wire is not correctly installed, is missing,
or if there is a ferrule ended safety cable installed on any set of
upper end or lower end fasters of the M/R slip ring, before further
flight, remove the incorrectly installed lock wire or ferrule ended
safety cable from service, as applicable, and inspect the fastener
torque by applying 1-1.25 Nm of torque.
(A) If the torque of a screw installed in the inner diameter (the connect-
or flange) of the upper end of the M/R slip ring is below 1 Nm of
torque, do not remove or replace the screw, before further flight,
apply a torque of 1-1.25 Nm.
(B) If the torque of a screw installed in the outer diameter of the upper
end, in the inner diameter of the lower end (shaft extension attach-
ment area), or in the outer diameter of the lower end is below 1 Nm of
torque, before further flight, remove the affected screw and washer
from service, install a new screw and washer, and apply a torque of 1
-1.25 Nm.
(C) Install double-twist lock wire by following the Compliance Instruc-
tions, paragraphs 9)a) through g) of Annex A to ASB 139-472 or ASB 189
-138, as applicable to your model helicopter.
(vi) Mark the letter "L" following the S/N on the identification label by
following the Compliance Instructions, paragraph 3) of Annex A to ASB
139-472 or ASB 189-138, as applicable to your model helicopter.
(2) As of the effective date of this AD, do not install an M/R slip ring
identified in paragraph (c) of this AD unless the requirements of para
-graph (g)(1) of this AD have been accomplished.
(h) SPECIAL FLIGHT PERMITS
Special flight permits are prohibited.
(i) 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 Branch, send it to the attention of the
person identified in paragraph (j)(1) of this AD. Information may be
emailed to: 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.
(j) RELATED INFORMATION
(1) For more information about this AD, contact Steven Warwick, Aerospace
Engineer, Certification Section, Fort Worth ACO Branch, Compliance &
Airworthiness Division, 10101 Hillwood Pkwy., Fort Worth, TX 76177;
telephone (817) 222-5225; email steven.r.warwick@faa.gov.
(2) Moog Service Bulletin SB 16-01, Revision 5, undated, is attached as
Annex A to both ASB 139-472 and ASB 189-138. As the design approval
holder for the products identified in paragraph (c) of this AD, con-
tact Leonardo Helicopters for the Moog service information at the con-
tact information specified in paragraph (k)(3) of this AD. It is also
available at the contact information specified in paragraph (k)(4) of
this AD.
(3) The subject of this AD is addressed in European Aviation Safety Agency
(now European Union Aviation Safety Agency) (EASA) AD 2017-0083, dated
May 10, 2017, and EASA AD 2017-0087, dated May 12, 2017. You may view
the EASA ADs at https://www.regulations.gov in Docket No. FAA-2021-
0304.
(k) 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) Leonardo Helicopters Alert Service Bulletin (ASB) No. 139-472, dated
May 9, 2017.
(ii) Leonardo Helicopters ASB No. 189-138, dated May 12, 2017.
(3) For Leonardo Helicopters service information identified in this AD,
contact Leonardo S.p.A. Helicopters, Emanuele Bufano, Head of Airworth
-iness, Viale G.Agusta 520, 21017 C.Costa di Samarate (Va) Italy; tele
-phone +39-0331-225074; fax +39-0331-229046 or at https://www.leonardo
company.com/en/home.
(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 refer-
ence at the National Archives and Records Administration (NARA). For
information on the availability of this material at NARA, email:
fedreg.legal@nara.gov, or go to: https://www.archives.gov/federal-
register/cfr/ibr-locations.html.
Issued on June 8, 2021. Lance T Gant, Director, Compliance & Airworthiness
Division, Aircraft Certification Service.
FOR FURTHER INFORMATION CONTACT: Steven Warwick, Aerospace Engineer, Cer-
tification Section, Fort Worth ACO Branch, Compliance & Airworthiness
Division, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone (817) 222-
5225; email steven.r.warwick@faa.gov.
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