Airworthiness directives › 2010-26-09
AD 2010-26-09 Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model S76A, B, and C Helicopters
Models named: S-76A, B, C. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model S-76A, B, and C helicopters, with LITEF LCR-100, Attitude Heading and Reference System (AHRS) Unit, part number (P/N) 145130-7100, installed, certificated in any category.
Compliance
Within 5 days, unless accomplished previously, and any time thereafter when installing a LITEF LCR-100, AHRS Unit, P/N 145130-7100. To implement operating limitations based on an anomaly in the AHRS related to the 26-volt AC inverter that could result in a decoupling of both autopilots and to prevent loss of the helicopter during instrument meteorological conditions (IMC) and while operating under instrument flight rules (IFR) and night flight, do the following: (a) By referencing the nameplate of the No. 1 and No. 2 AHRS unit, determine whether the modification (Mod) status is at “18.” If the Mod status is “18” for either AHRS unit: (1) Install instrument panel placards as shown in Figure 2 in the areas depicted in Figure 3 of Sikorsky Alert Service Bulletin No. 76-34-11, dated May 17, 2010 (ASB), and by following the Accomplishment Instructions, paragraph 3.A.(6)(c) through (d) of the ASB. (2) Revise the “Minimum Flight Crew” section of the Operating Limitations section of the Rotorcraft Flight Manual (RFM) as follows: “For helicopters with an LCR-100 Mod Status ‘18’ AHRS installed, two pilots are required for IFR and night flights.” (3) Revise the “Airspeed Limits” section of the Operating Limitations section of the RFM as follows: “For helicopters with an LCR-100 Mod Status ‘18’ AHRS installed, airspeed is limited to 120 knots indicated airspeed (KIAS) when both autopilots are uncoupled and operating at night or in IMC.” (4) When present, remove and discard the following Active Temporary Revisions from the Operating Limitations section of the RFM for each affected helicopter: Table 1 Model RFM document No. Active temporary rev. No. S-76A SA-4047-76-1 T-Revision 3. S-76B SA 4047-76B-1 T-Revision 3. S-76C (TurboMeca Arriel 1S1 engines installed) SA 4047-76C-1 T-Revision 3. S-76C (TurboMeca Arriel 2S1 engines installed) SA 4047-76C-10 T-Revision 4. S-76C (TurboMeca Arriel 2S1 engines installed and s/n 760511 and subsequent) SA 4047-76C-14 T-Revision 4. S-76C (TurboMeca Arriel 2S2 engines installed) SA 4047-76C-15 T-Revision 1. (5) Revise the Operating Limitations section of the RFM by inserting a copy of this AD into the appropriate section of the RFM. (b) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Boston Aircraft Certification Office, FAA, Attn: Tony Pigott, Aviation Safety Engineer, 12 New England Executive Park, Burlington, MA 01803, telephone (781) 238-7158, fax (781) 238-7170. (c) The Joint Aircraft System/Component (JASC) Code is 3420: Navigation. (d) Installing the placards shall be done by following the specified portions of Sikorsky Alert Service Bulletin No. 76-34-11, dated May 17, 2010. The Director of the Federal Register approved this incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Sikorsky Aircraft Corporation, Attn: Manager, Commercial Technical Support, mailstop s581a, 6900 Main Street, Stratford, CT, telephone (203) 383-4866, e-mail address tsslibrary@sikorsky.com, or at http://www.sikorsky.com. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas, or 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/code_of_federal_regulations/ibr_locations.html. (e) This amendment becomes effective on January 12, 2011. Issued in Fort Worth, Texas, on December 13, 2010. Lance T. Gant, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 2010-31962 Filed 12-27-10; 8:45 am] BILLING CODE 4910-13-P
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1