Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B19 (Regional Jet Series 100) series airplanes, that currently requires revising the Airplane Flight Manual (AFM) to require the flight crew to check, and reset, if necessary, certain instrument settings prior to each takeoff and after any event during which generators are switched. This action would add a new revision to the AFM and would revise the applicability of the existing AD. This action also would require modification of the air data reference systems. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent uncommanded changes in certain instrument settings on the pilot's and co-pilot's instrument displays, which could result in confusion among the flight crew about the correct position and flight configuration of the airplane.