EASA 2020-0074

Requires correcting the aviation maintenance manual (AMM) task to check the Horizontal stabilizer primary trim system secondary power source. Certification Maintenance Requirement (CMR) task AL-27-40-022 “Horizontal stabilizer primary trim system secondary power source” was incorrectly implemented in the Pilatus PC-24 AMM Chapter 4. The CMR task requires a test with the right-hand bus loss simulated, while the incorrectly stated AMM task simulates loss of essential (ESS) bus. In this situation, failure of the manual pitch trim—the redundant part that is powered by the essential (ESS) bus—would not be identified by the incorrect AMM task.