Airworthiness directives › 2019-19-12
AD 2019-19-12 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Models named: S-76C. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Sikorsky Aircraft Corporation Model S-76C helicopters, certificated in any category, with a Turbomeca, S.A., Arriel 2S1 or Arriel 2S2 engine with an engine collective position transducer (CPT) part number (P/N) 76900-01821-104 or 76900-01821-105 installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 130 hours time-in-service (TIS): (i) Measure resistance of each engine CPT and replace the CPT if the measured resistance is not within tolerance by following the Accomplishment Instructions, paragraphs 3.C.(1) through 3.C.(8)(b), of Sikorsky S-76 Helicopter Alert Service Bulletin ASB 76-73-8, Revision A, dated December 4, 2015 (ASB 76-73-8A), if using Test Box P/N 76700-40009-042 or by following paragraph 3.B.(11) of Sikorsky Maintenance Manual, SA 4047-76C-2, Temporary Revision No. 73-08, dated September 20, 2017 (TR 73-08) or paragraph 3.B.(11) of Sikorsky Maintenance Manual, SA 4047-76C-2, Temporary Revision No. 73-10, dated June 25, 2019 (TR 73-10), if using Test Box P/N 76700-40009-043. You are not required to use Sikorsky's CPT data sheet or submit a data sheet to Sikorsky. (ii) Measure the linearity resistance movement of each engine CPT and replace the CPT if there is a linear abnormality or change in resistance that is not within tolerance by following the Accomplishment Instructions, paragraphs 3.D.(1) through 3.D.(14)(b), of ASB 76-73-8A, if using Test Box P/N 76700-40009-042 or by following paragraph 3.B.(12) of TR 73-08 or paragraph 3.B.(12) of TR 73-10, if using Test Box P/N 76700-40009-043. You are not required to use Sikorsky's CPT data sheet or submit a data sheet to Sikorsky. (iii) Measure the differential voltage of each engine CPT and replace the CPT if the measured voltage is not within tolerance by following the Accomplishment Instructions, paragraphs 3.E. through 3.G.(1) of ASB 76-73-8A, if using Test Box P/N 76700-40009-042 or by following paragraph 3.B.(13) of TR 73-08 or paragraph 3.B.(13) of TR 73-10, if using Test Box P/N 76700-40009-043. You are not required to use Sikorsky's CPT data sheet or submit a data sheet to Sikorsky. (2) Thereafter, at intervals not to exceed 300 hours TIS: (i) If using Test Box P/N 76700-40009-042: (A) Measure resistance of each engine CPT and replace the CPT if the resistance is not within tolerance by following paragraph 4.B.(11) of Sikorsky Maintenance Manual, SA 4047-76C-2, Temporary Revision No. 73-07, dated August 17, 2016 (TR 73-07), except you are not required to use Sikorsky's CPT data sheet or return a failed CPT to Sikorsky. (B) Measure the linearity resistance movement of each engine CPT and replace the CPT if the movement exceeds tolerance by following paragraphs 4.B.(12)(a) through 4.B.(13)(f) of TR 73-07, except you are not required to use Sikorsky's CPT data sheet or return a failed CPT to Sikorsky. (C) Measure the differential voltage of each CPT by following paragraphs 4.B.(14) through 4.B.(15)(h) of TR 73-07, except you are not required to use Sikorsky's CPT data sheet. If the maximum voltage is greater than 100 millivolts or the minimum voltage is less than −100 millivolts, replace the CPT. (ii) For helicopters using Test Box P/N 76700-40009-043: (A) Measure resistance of each engine CPT and replace the CPT if the resistance is not within tolerance by following paragraph 5.B.(11) of TR 73-07, paragraph 3.B.(11) of TR 73-08, or paragraph 3.B.(11) of TR 73-10, except you are not required to use Sikorsky's CPT data sheet or return a failed CPT to Sikorsky. (B) Measure the resistance linearity of each engine CPT and replace the CPT if the resistance is not within tolerance by following paragraph 5.B.(12) of TR 73-07, paragraph 3.B.(12) of TR 73-08, or paragraph 3.B.(12) of TR 73-10, except you are not required to use Sikorsky's CPT data sheet or return a failed CPT to Sikorsky. (C) Measure the differential voltage of each engine CPT and replace the CPT if the resistance is not within tolerance by following paragraphs 5.B.(13)(a) through 5.B.(13)(k) of TR 73-07, paragraph 3.B.(13) of TR 73-08, or paragraph 3.B.(13) of TR 73-10, except you are not required to use Sikorsky's CPT data sheet or return a failed CPT to Sikorsky.
Unsafe condition
This AD was prompted by reports of wear of the CPT that has resulted in several One Engine Inoperative (OEI) incidents. The FAA is issuing this AD to prevent failure of a CPT. The unsafe condition, if not addressed, could result in a reduction in power to one engine resulting in an annunciated momentary OEI condition and subsequent emergency landing.
Affected ADs
This AD replaces AD 2018-10-07, Amendment 39-19282 (83 FR 23355, May 21, 2018).
Read the original on the Federal Register →
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