Airworthiness Directive · Amendment 39-16656 · Honeywell International Inc. LTS101 Series Turboshaft Engines and LTP101 Series Turboprop Engines
Honeywell International Inc. LTS101 Series Turboshaft Engines and LTP101 Series Turboprop Engines
This AD applies to Honeywell International LTS101-600A-2, -3, -3A, LTS101-700D-2, LTS101-650B-1, LTS101-650C-3, LTS101-650C-3A, LTS101-750B-1, LTS101-750B-2, LTS101-750C-1, and LTS101-850B-2 turboshaft engines; and LTP101-600A-1A and LTP101-700A-1A turboprop engines with power turbine rotor, part number (P/N) 4-141-290-01, -02, -03, -05, -06, -11, -12, -13, -14, or -16, installed. These engines are installed on, but not limited to, Eurocopter AS350 and BK117 series and Bell 222 series helicopters; and Page Thrush, Air Tractor AT-302, and Pacific Aero 08-600, Piaggio P166 DL3, and Riley International R421 airplanes.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires removing certain power turbine rotors from service using a specific drawdown schedule. This AD was prompted by reports of fatigue cracks in the airfoil of the power turbine blades. We are issuing this AD to prevent fracture of the power turbine blade airfoil, which could result in sudden loss of engine power and prevent continued safe flight or safe landing.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
(f) For engines with power turbine rotors, P/Ns 4-141-290-11, -12, -13, and -14, marked with “ORI T41881,” on the aft hub in the vicinity of the P/N, no further action is required.
For LTS101-600A-2, -3, -3A, and LTS101-700D-2 turboshaft engines and LTP101-600A-1A and LTP101-700A-1A turboprop engines, remove power turbine rotors, P/Ns 4-141-290-01, -02, -03, -05, -06, -11, -12, -13, -14, or -16, using the cycles specified in Table 1 of this AD:
| If power turbine rotor time on the effective date of this AD is... | Then remove the power turbine rotor from the engine... |
|---|---|
| (1) Fewer than 5,000 cycles-since-new (CSN) | Between 5,000 and 5,500 CSN. |
| (2) 5,000 to 7,899 CSN | Within 500 cycles-in-service (CIS) after the effective date of this AD or before exceeding 8,000 CSN, whichever occurs first. |
| (3) 7,900 to 9,999 CSN | Within 100 CIS after the effective date of this AD or before exceeding 10,050 CSN, whichever occurs first. |
| (4) 10,000 or more CSN | Within 50 CIS after the effective date of this AD. |
Remove power turbine rotors, P/Ns 4-141-290-01, -02 -03, -05, -06, -11, -12, -13, -14, or -16, using the cycles specified in Table 2 of this AD:
| If power turbine rotor time on the effective date of this AD is... | Then remove the power turbine rotor from the engine... |
|---|---|
| (1) Fewer than 5,500 CSN | Between 5,000 and 7,200 CSN. |
| (2) 5,500 to 7,999 CSN | Within 1,700 CIS after the effective date of this AD or before exceeding 8,950 CSN, whichever occurs first. |
| (3) 8,000 to 9,999 CSN | Within 950 CIS after the effective date of this AD or before exceeding 10,400 CSN, whichever occurs first. |
| (4) 10,000 or more CSN | Within 400 CIS after the effective date of this AD. |
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.
Engines
