Airworthiness Directive · Amendment 39-14284 · Boeing Model 737-300, -400, -500, -600, -700, -700C, -800 and -900 Series Airplanes
Boeing Model 737-300, -400, -500, -600, -700, -700C, -800 and -900 Series Airplanes
This AD applies to Boeing Model 737-300, -400, -500, -600, -700, -700C, -800 and -900 series airplanes, certificated in any category; equipped with two Smiths Industries Aerospace Flight Management Computers (FMCs) having part number 171497-05-01 or 176200-01-01; installed with operational program software (OPS) version U10.3, U10.4, U10.4A, or U10.5.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, -500, -600, -700, -700C, -800 and - 900 series airplanes. This AD requires installing an updated version of the operational program software (OPS) and certain other software in the flight management computers (FMCs); and doing configuration checks to ensure that certain software is properly installed and doing other specified actions. This AD also requires reinstalling software, if necessary. This AD results from one operator reporting FMC map shifts on several Model 737-400 series airplanes with dual FMCs, using OPS version U10.4A. We are issuing this AD to prevent the FMC from displaying the incorrect actual navigation performance value to the flightcrew, which could prevent adequate alerting of a potential navigation error. This condition could result in a near miss with other airplanes or terrain, or collision if other warning systems also fail.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 180 days after the effective date of this AD, do the actions specified in paragraphs (f)(1) and (f)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-34A1801, dated July 15, 2004 (for Model 737-600, -700, -700C, -800 and -900 series airplanes); or Boeing Alert Service Bulletin 737-34A1821, dated July 15, 2004 (for Model 737-300, -400, and -500 series airplanes); as applicable. Where the service bulletin specifies a configuration check, certificated maintenance personnel must perform the configuration check.
(1) Install the updated version of the OPS, the compatible model/engine database (MEDB) software if applicable, the current version of the navigational database (NDB) software, and the software options database (OPC) in the left and right FMCs.
(2) Do configuration checks of the left and right FMCs to ensure that the updated version of the OPS, compatible version of the MEDB software if applicable, and OPC software is correctly installed.
If the incorrect software version of the OPS, MEDB software if applicable, or OPC software is found installed on any FMC during any configuration check required by paragraph (f) of this AD: Before further flight, reinstall the software, as applicable. Do the reinstallation of any software in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-34A1801, dated July 15, 2004; or Boeing Alert Service Bulletin 737-34A1821, dated July 15, 2004; as applicable.
Doing the applicable actions specified in paragraphs (h)(1) and (h)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-34-1768, dated August 11, 2005 (for Model 737-600, -700, -700C, -800, and -900 series airplanes); or Boeing Service Bulletin 737-34-1879, dated August 11, 2005 (for Model 737-300, -400, and -500 series airplanes), as applicable, is acceptable for compliance with the corresponding requirements of paragraphs (f) and (g) of this AD.
(1) Install version U10.6 of the OPS software, the applicable OPC software, the new compatible MEDB software if applicable, 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. Where the service bulletin specifies a configuration check, certificated maintenance personnel must perform the configuration check.
(2) 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 paragraph (h)(1) of this AD: Before further flight, reinstall the software, as applicable. Do the reinstallation of any software in accordance with the applicable service bulletin.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
