Airworthiness Directive · Amendment 39-19348 · Rotorcraft cooling fan system
Leonardo S.p.A. Helicopters (Type Certificate Previously Held By Finmeccanica S.p.A., AgustaWestland S.p.A)
This AD applies to Leonardo S.p.A. (Type Certificate previously held by Finmeccanica S.p.A., AgustaWestland S.p.A) Model A109E, A109S, and AW109SP helicopters with an oil cooler fan assembly (fan assembly) part number (P/N) 109-0455-01-103 installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Leonardo S.p.A. (Leonardo) Model A109E, A109S, and AW109SP helicopters with an oil cooler fan assembly (fan assembly) installed. This AD requires inspecting each oil cooler system pulley assembly (pulley assembly) bearing and replacing each fan assembly. This AD is prompted by reports of degraded pulley assembly bearings. The actions of this AD are intended to correct an unsafe condition on these products.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 5 hours time-in-service (TIS), remove the fan belt from each pulley assembly and, using a borescope inspect the grease shield of each bearing P/N 109G6320L01-101 for a crack, leaking grease, and position of the grease shield.
(i) If there is a crack, any leaking grease, or if the grease shield is out of position, before further flight, replace each fan assembly P/N 109-0455-01-103 on both sides of the helicopter with a fan assembly P/N 109-0455-01-101.
(ii) If there are no cracks, no leaking grease, and the grease shield is correctly positioned, inspect each bearing P/N 109G6320L01-101 for axial and radial play and freedom of rotation.
(A) If there is any axial or radial play, rotation resistance, or binding, before further flight, replace each fan assembly P/N 109-0455-01-103 on both sides of the helicopter with a fan assembly P/N 109-0455-01-101.
(B) If there is no play, no rotation resistance, and no binding, within 20 hours TIS, replace each fan assembly P/N 109-0455-01-103 on both sides of the helicopter with a fan assembly P/N 109-0455-01-101.
(2) After the effective date of this AD, do not install a fan assembly P/N 109-0455-01-103 on any helicopter.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
