Airworthiness Directive · Amendment 39-21794 · Electrical power system
ASI Aviation (Type Certificate Previously Held by Reims Aviation S.A.) Airplanes
This AD applies to ASI Aviation (type certificate previously held by Reims Aviation S.A.) Model F406 airplanes, all serial numbers, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all ASI Aviation (type certificate previously held by Reims Aviation S.A.) Model F406 airplanes. This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as failure of a circuit breaker (CB) switch. This AD requires replacing certain CB switches and establishing a life limit for the CB switches. The FAA is issuing this AD to address the unsafe condition on these products.
Within 200 hours time-in-service (TIS) or within 12 months, whichever occurs first after the effective date of this AD, prepare the airplane and gain access in accordance with steps 1 through 7 of the Accomplishment Instructions in ASI Aviation Service Bulletin No. F406-62, Revision 01, dated December 14, 2018 (SB F406-62R1), and inspect each avionics bus CB switch part number (P/N) CM3589-50 to identify the date code.
(1) If a CB switch does not have a date code, before further flight, remove the CB switch from service and install CB switch P/N 4061-2400-1 in accordance with steps 9 through 14 of the Accomplishment Instructions in SB F406-62R1.
(2) If a CB switch has a date code earlier than 0434, before the CB switch exceeds 1,000 hours TIS since first installation on an airplane, remove the CB switch from service and install CB switch P/N 4061-2400-1 in accordance with steps 9 through 14 of the Accomplishment Instructions in SB F406-62R1.
(3) If a CB switch has a date code 0434 or later, before the CB switch exceeds 6 years since first installation on an airplane or within 12 months after the effective date of this AD, whichever occurs later, remove the CB switch from service and install CB switch P/N 4061-2400-1 in accordance with steps 9 through 14 of the Accomplishment Instructions in SB F406-62R1.
Within 200 hours TIS or within 12 months, whichever occurs first after the effective date of this AD, remove each CB switch P/N CM3589-20 from service, re-identify the CB panel, and install CB switches with P/N 406E2450-00000-100 in accordance with Part 1, steps 1 through 13, of the Accomplishment Instructions in ASI Aviation Service Bulletin No. F406-90, dated December 14, 2018 (SB F406-90).
Before exceeding 6 years since first installation on an airplane and thereafter at intervals not to exceed 6 years, remove each CB switch P/N 4061-2400-1 and P/N 406E2450-00000-100 from service and replace it in accordance with steps 9 through 14 of the Accomplishment Instructions in SB F406-62R1 or Part 1, steps 1 through 13, of the Accomplishment Instructions in SB F406-90, as applicable.
