Airworthiness Directive · Amendment 39-22554 · Landing gear brake system
Aircraft Industries, a.s. Airplanes
This AD applies to Aircraft Industries, a.s. Model L-420, L 410 UVP-E20, and L 410 UVP-E20 CARGO airplanes, all serial numbers, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Aircraft Industries, a.s. Model L-420, L 410 UVP-E20, and L 410 UVP-E20 CARGO airplanes. This AD was prompted by reports of the pressure plates within the main landing gear (MLG) wheel brake unit malfunctioning. This AD requires replacing certain MLG wheel brake units with serviceable parts and prohibits installing an affected part on any airplane. The FAA is issuing this AD to address the unsafe condition on these products.
The following definitions apply to this AD:
(1) An “affected part” is an MLG wheel brake unit part number (P/N) K38-1200-7 having serial number XXX-35, XXX-36, XXX-37, or XXX-38, where X represents any numerical value and where the MLG wheel brake unit has not been modified using sections B. and C. of the Implementation Information in LET Aircraft Industries Service Bulletin L-410/039a, Revision 1, dated October 25, 2022 (LET SB L-410/039a, Revision 1).
(2) A “serviceable part” is an MLG wheel brake unit that is not P/N K38-1200-7 having serial number XXX-35, XXX-36, XXX-37, or XXX-38, where X represents any numerical value or where the MLG wheel brake unit P/N K38-1200-7 having serial number XXX-35, XXX-36, XXX-37, or XXX-38 has been modified using sections B. and C. of the Implementation Information in LET SB L-410/039a, Revision 1.
(1) For airplanes with an affected part installed: Before each affected part accumulates 1,500 hours time-in-service (TIS) since the affected part's first installation on any airplane or within 10 hours TIS after the effective date of this AD, whichever occurs later, replace each affected part with a serviceable part.
(2) As of the effective date of this AD, do not install an affected part on any airplane.
