Document ID: chunk:federal_register_of_legislation:F2005L03166:body:0:p2
Version: federal_register_of_legislation:F2005L03166
Segment Type: other
Provision Reference: 
Character Range: 2907–4918

and the NDB software in the left and right FMCs; install the common display system (CDS) OPC software in the left and right display electronic units if applicable; and do configuration checks to ensure that certain software is properly installed.
                  b. If the incorrect software version of the OPS, OPC software, CDS OPC software if applicable, or MEDB software if applicable, is found installed during any configuration check required by the above sub-paragraph, before further flight, reinstall the software, in accordance with the applicable service bulletin.
             Later revisions of the above ASBs or SBs, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-19-19, are considered acceptable for compliance with the equivalent Requirements of this Directive.
             Note 3:  FAA AD 2005-19-19 Amdt 39-14284 refers.
Compliance:  For Requirement 1 - Within 180 days after the effective date of this Directive.
             For Requirement 2 - Before further flight, after the Requirement 1.b. configuration check.
             This Airworthiness Directive becomes effective on 24 November 2005.
Background:  The United States Federal Aviation Administration (FAA) has received advice from an operator reporting FMC map shifts on several Model 737-400 series aeroplanes with dual FMCs, using OPS version U10.4A.  This condition if not corrected could prevent adequate alerting of a potential navigation error and could result in a near miss with other aeroplanes or terrain, or collision if other warning systems also fail.
             This Directive requires the installation of an updated version of the operational program software (OPS) and certain other software in the flight management computers (FMCs) together with the completion of configuration checks to ensure that certain software is properly installed.

Jayaprakashan Ambali
Delegate of the Civil Aviation Safety Authority

12 October 2005