23-27-00
ALL ú ú 04 Page 102 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~............................................................................... | PROBLEM | POSSIBLE CAUSE | ISOLATION PROCEDURE | CORRECTION | .................................................................................
| VHF transceiver| Make sure that ACARS is | Set the correct|| |
|
| | | | is not tuned | set to the correct data | frequency| | | to the local | link frequency. Refer to| | | | data frequency | vendor information.| | | | | | | | Cannot enter | Defective || Replace the CU with a CU | Replace the CU || |
| | | data at the | button on CU | that you know operates| | | CU: FLT NO., | | correctly.| | | TO ENG, POS, | | | | | etc| | | | | | | | | | OUT/IN | Failed sensor || Do a test of the OOOI | Replace failed || |
| | | event(s) did | circuit on | sensors. Refer to | switch.| | not register | aircraft | 23-27-00/501.| | | | | | | | OFF/ON | Failed ACARS || Do at check of the ACARS | Replace the| |
| | | events did | LANDING DATA | LANDING DATA switc | ACARS LANDING| | not register | switch | | SWITCH| | | | | | | Cannot do GMT | Aircraft not| | Make sure that a door is| | |
| | Open a door and| | auto update | in the "IN" | open and the parking brake | set the parking| | and NO COMM | configuration | is set.| | | is not shown.| | | | | | | | | | Loss of all | Failed circuit | Remove the MU.| Close the | Replace circuit|| |
| | | data during | breaker | ACARS DC circuit breaker. | breaker| | airplane | | Make sure +28VDC is avail-| | | power transfer| | able at pin 10 on connector| | | | | D1967C (pin 11 is ground).| | | | | (NOTE: Due to the very low| | | | | current, the DC circuit| | | | | circuit breaker can| | | | | become contaminated.)| | | | | | | 2...............…................….............................…................1
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23-27-00
ALL ú ú 03 Page 103 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
AIRCRAFT COMMUNICATIONS ADDRESSING AND REPORTING SYSTEM (ACARS) - ADJUSTMENT/TEST
_________________________________________________________________________________
1. General_______
A. There are two tasks in this procedure. The first task is the operational test of the Aircraft Communications Addressing and Reporting System (ACARS). The second task is the system test.
B. The operational test is a minimum check of the basic ACARS and
Interactive Display Unit (IDU) operation.
C. The system test contains checks of all of the primary ACARS functions. The test includes checks of the OOOI sensor operation and of the VHF to the ACARS interface. The checks in the operational test are also in the system test.
D. When the ACARS cannot make a link with the ground station, the NOCOMM indicator will come on. This is usually not an indication of a system failure. One of these conditions will cause the NOCOMM indication:
(1)
The RF path between the VHF antenna and the ground station is blocked. It can help to move the airplane to a better position. You will connnect the VHF-1 antenna cable to the VHF-3 transceiver before the tests. The VHF-1 antenna is on the top of the airplane and will usually give the best results.
(2)
The VHF-3 system does not operate correctly (Ref 23-21-00/501).
(3)
The ground station has a problem. Tell them that you cannot make a link. If they have a problem, other airplanes that use the data link will also get NOCOMM indications.
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