Airworthiness Directive · Amendment 39-19350 · Engine controls
GE Aviation Czech s.r.o. Turboprop Engines
Superseded. A later AD replaced this one: AD 2021-20-21. Comply with the one in force.
This AD applies to GE Aviation Czech H80-200 turboprop engines with propeller governor part number, (P/N) P-W22-1, and Avia Propeller AV-725 propellers installed. These engines are installed on Aircraft Industries (AI) L 410 UVP-E20 and L 410 UVP-E20 CARGO airplanes.
We are adopting a new airworthiness directive (AD) for certain GE Aviation Czech H80-200 turboprop engines. This AD requires replacing the beta switch and adjusting the engine push-pull control to prevent the propeller governor control from going to a negative thrust position. This AD was prompted by an accident involving an Aircraft Industries (AI) L 410 UVP-E20 airplane caused by one propeller going to a negative thrust position during the landing approach. We are issuing this AD to address the unsafe condition on these products.
Within 25 flight hours, 20 flight cycles, or 30 days, whichever occurs first after the effective date of this AD, inspect and adjust the engine push-pull control, P/N M601-76.3, and replace beta switch, P/N P-S-2, with beta switch, P/N P-S-2A, in accordance with paragraphs 1.6. and 1.7. of GE Aviation Czech Service Bulletin (SB) SB-H80-76-00-00-0036, Revision No. 02, dated March 29, 2018.
After the effective date of this AD:
(1) Do not install beta switch, P/N P-S-2, on any engine.
(2) Do not install a GE Aviation Czech H80-200 turboprop engine on any airplane unless the required actions in paragraph (g) of this AD have been complied with. This engine installation prohibition does not apply to an engine removal and subsequent re-installation on the same airplane during an airplane maintenance visit.
