(2)
If the FMC fails its power-up tests with a fatal error, the FMC does not transmit to the CDU. In this case the CDU displays the menu page with the "FMC" prompt removed. This is the indication of a failed FMC.
D. Ground Maintenance Support
(1)
General
(a)
Built-In-Test-Equipment (BITE) is a function of the FMCS. This function provides ground maintenance personnel with a procedure for troubleshooting the FMS.
(b)
A further supplement to ground maintenance is the portable data loader. The protable data loader is used, as required, to load and update the navigation data base of the FMC.
(2)
Fault Recording for Maintenance
(a) The FMCS aids the operator in isolating faults that occur in sensors and components that interface with the FMCS. A failure noted in the air sometimes cannot be duplicated on the ground. To help in deciding which part of the avionics is responsible for interruption of FMS operation, the FMCS provides a group of maintenance function pages. These pages record the in-flight failure history of interfacing sensors and components. The recording is maintained in the FMC NV RAM; the data is collected and held for failure incidents of the past nine flights. The FMCS records the reason for the failure, the approximate time of the failure, and the unit in which the failure was detected.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(3) Total FMS BITE
(a) The CDU acts as the focal control and display for actuating and evaluating FMCS, DFCS, A/T, IRS, and EFIS self-tests. When the airplane is on the ground, these tests are available for use by maintenance personnel. Once the test has been initiated from the CDU, the system under test will transmit plain text messages, for display on the CDU. In response to the messages the operator can set flight deck controls, and/or perform data entries through the CDU. Test passage or failure is indicated on the CDU display.
13. FMCS Messages_____________
A. General
(1)
The FMCS (Flight Management Computer System) displays a set of messages for information. These messages are displayed in the scratch pad line of the CDU when conditions warrant their appearance. There are three categories of messages. the messages have a defined priority for display should their set conditions occur at the same time. The three types, listed in order of highest priority, are: Entry Error Advisory Messages, Alerting Messages, and Readiness Advisory Messages
(2)
AIRPLANES WITHOUT ACARS; The FMCS (Flight Management Computer System) displays a set of messages for information. These messages are displayed in the scratch pad line of the CDU when conditions warrant their appearance. There are three categories of messages. the messages have a defined priority for display should their set conditions occur at the same time. The three types, listed in order of highest priority, are: Alerting Messages, Entry Error Advisory Messages, and Readiness Advisory Messages
(3)
AIRPLANES WITH ACARS; The FMCS (Flight Management Computer System) displays a set of messages for information. These messages are displayed in the scratch pad line of the CDU when conditions warrant their appearance. There are four categories of messages. the messages have a defined priority for display should their set conditions occur at the same time. The four types, listed in order of highest priority, are: Alerting Messages, Entry Error Advisory Messages, Readiness Advisory Messages, and ACARS Annunciation Messages.
B. Entry Error Advisory Messages (Fig. 15)
(1) Entry error advisory messages indicate that an entry of data from the scratch pad into a data field is not correct. The operator must clear the message and repeat the entry in the proper manner. These messages appear only on the CDU on which the data entry attempt was made.
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