Division Agusta A109 Series Helicopters - AD/A109/62 - Engine - Power Turbine Speed - Operational Limitation - Agusta A109 Series Helicopters

Agusta A109 Series Helicopters

AD/A109/62	Engine - Power TurbineSpeed - Operational Limitation	4/2009 TX

Applicability:	Agusta S.p.A. A109A, A109AII and A109C helicopters, all serial numbers if equipped with Rolls-Royce Corporation (formerly Allison) engine model 250-C20B or 250-C20R/1 with a third stage turbine wheel having part number (P/N) 23065833 installed.
Requirement:	Accomplish the requirements specified below in accordance with the instructions of Agusta BT 109-129 dated 16 February 2009.1. Avoid steady-state operation in the 95-97% N2 range for more than 60 seconds in single or cumulative events. If steady-state operation in the 95-97% N2 range exceeds 60 seconds in single or cumulative events, before further flight perform specific corrective actions as per Rolls-Royce CEB A-1400 Rev. 3.Note 1: Steady-state operation is defined as any manoeuvre during which an attempt is being made to maintain a constant engine speed within 2% N2.2. Install on the instruments panel below or near the “ENGINE & ROTOR RPM POWER TURBINE (N2)” indicator, in an area visible by the pilot(s), one of the two decals (depending on the applicable instruments panel configuration) shown in figure 1 of Agusta BT 109-129 reporting the following text:“MIN. CONT. 97% N2 - MIN. TRANS. 95% N2”3. A109A and A109AII helicopters:Insert page 5 or 6, as applicable depending on the helicopter model, of Agusta BT 109-129 in the Flight Manual, Section I - OPERATING LIMITATIONS, paragraph “POWER PLANT LIMITATIONS”.4. A109C helicopters:Insert page 7 of Agusta BT 109-129 in the Flight Manual, Section I -LIMITATIONS, paragraph “POWER PLANT AND TRANSMISSION LIMITATIONS”.The use of later approved revisions of the documents detailed in this AD is acceptable for compliance with the requirements of this AD.

Applicability:

Agusta S.p.A. A109A, A109AII and A109C helicopters, all serial numbers if equipped with Rolls-Royce Corporation (formerly Allison) engine model 250-C20B or 250-C20R/1 with a third stage turbine wheel having part number (P/N) 23065833 installed.

Requirement:

Accomplish the requirements specified below in accordance with the instructions of Agusta BT 109-129 dated 16 February 2009.1. Avoid steady-state operation in the 95-97% N2 range for more than 60 seconds in single or cumulative events. If steady-state operation in the 95-97% N2 range exceeds 60 seconds in single or cumulative events, before further flight perform specific corrective actions as per Rolls-Royce CEB A-1400 Rev. 3.Note 1: Steady-state operation is defined as any manoeuvre during which an attempt is being made to maintain a constant engine speed within 2% N2.2. Install on the instruments panel below or near the “ENGINE & ROTOR RPM POWER TURBINE (N2)” indicator, in an area visible by the pilot(s), one of the two decals (depending on the applicable instruments panel configuration) shown in figure 1 of Agusta BT 109-129 reporting the following text:“MIN. CONT. 97% N2 - MIN. TRANS. 95% N2”3. A109A and A109AII helicopters:Insert page 5 or 6, as applicable depending on the helicopter model, of Agusta BT 109-129 in the Flight Manual, Section I - OPERATING LIMITATIONS, paragraph “POWER PLANT LIMITATIONS”.4. A109C helicopters:Insert page 7 of Agusta BT 109-129 in the Flight Manual, Section I -LIMITATIONS, paragraph “POWER PLANT AND TRANSMISSION LIMITATIONS”.The use of later approved revisions of the documents detailed in this AD is acceptable for compliance with the requirements of this AD.

	Note 2: EASA Emergency AD 2009-0037-E dated 19 February 2009 refers.
Compliance:	For Requirements 1 through 4 - Within the next 5 flight hours after the effective date of this AD but no later than 28 February 2009, whichever occurs first.
	This Airworthiness Directive becomes effective on 23 February 2009.
Background:	Following several third stage turbine wheel failures, the engine Type Certificate holder, Rolls-Royce Corporation, issued Commercial Engine Bulletin (CEB) A-1400 Rev. 3 to introduce an operational limitation on the power turbine N2 speed range (95% - 97%) for more than 60 seconds in single or cumulative events for engines with a third stage turbine wheel having P/N 23065833 installed.Thereafter, Agusta issued Bollettino Tecnico (BT) 109-129 to introduce the same operating limitation, which is also required by this AD, on the affected helicopters.

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