Airworthiness Directive · Amendment 39-13762 · BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
All Model Avro 146-RJ series airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes, that requires replacing the existing digital flight guidance computer(s) (DFGC) with a new or modified DFGC(s). This action is necessary to prevent a premature flare from occurring on approach due to erroneous data being provided to the DFGC(s); and also to prevent uncertainty about autopilot engagement status, which could cause the pilot to apply unneeded force to the control column and possibly result in a runaway condition of the autotrim. Either condition could lead to reduced controllability of the airplane. This action is intended to address the identified unsafe conditions.
To prevent a premature flare from occurring on approach due to erroneous data being provided to the DFGC(s); and also prevent uncertainty about autopilot engagement status, which could cause the pilot to apply unneeded force to the control column and possibly result in a runaway condition of the autotrim; either of which conditions could lead to reduced controllability of the airplane; accomplish the following:
(a) Within 29 months after the effective date of this AD, replace the existing DFGC(s) with a new or modified DFGC(s), in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Modification Service Bulletin SB.22-068-70628B, dated November 4, 2002.
(b) Although the service bulletin referenced in paragraph (a) of this AD specifies to submit information to the manufacturer, this AD does not include such a requirement.
(c) In accordance with 14 CFR 39.19, the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate, is authorized to approve alternative methods of compliance for this AD.
