Deviation Request #12 ETSO-C109#1 ETSO-C109#2 Airborne Navigation Data Storage System,

Use of a bi-directional data bus instead of two independent data buses one for data request and the other for data delivery. Exclude the Disk Drive Unit and the embedded Disk Controller from the 100% screening requirement.

ETSO-C109#1 Airborne Navigation Data Storage System

Use of a bi-directional data bus instead of two independent data buses one for data request and the other for data delivery.

ETSO-C109#2 Airborne Navigation Data Storage System

Exclude the Disk Drive Unit and the embedded Disk Controller (Commercial of the Shelf subcomponents) from the 100% screening requirement applying if the specified equipment performance exceeds the component manufacturer’s specified performance.