Data Link
Downlinks are data link messages transmitted to a ground station. Requests for data and reports of FMC information are two types of downlinks. Requests are made manually by the flight crew. Reports can be made manually or may occur automatically.
Uplinks are messages transmitted to the airplane. Most uplinks require manual selections by the flight crew. Some uplinks are input automatically.
Manual Downlinks
Select a REQUEST prompt to start the downlink request for data. REQUEST prompts are on PERF INIT, PERF LIMITS, TAKEOFF REF, PROGRESS, DES FORECASTS, RTE, ALTERNATE DEST, RTE DATA, and SUPP NAV DATA pages. Downlink reports of the active route may be accomplished by selection of the REPORT prompt on the PERF LIMITS or PROGRESS page and a position report may be downlinked by selection of the REPORT prompt on the PROGRESS page. The contents of the supplemental navigation database can be downlinked by selection of the REPORT prompt on the SUPP NAV DATA page.
When the communications function is unable to process FMC downlinks, the words FAIL, VOICE, NO COMM, or FULL are displayed on the CDU pages in place of the REQUEST and REPORT prompts and the header line displays the word DATALINK. The status messages are:
.
FAIL

.
the ACARS management unit is inoperative

.
VOICE

.
radio is operating in the VOICE mode

.
NO COMM

.
radio is operational but not available

.
FULL

.
all available downlink space is full.

Copyright . The Boeing Company. See title page for details.
11.33.2  March 29, 2004

Flight Management, Navigation -Company Data Link 737 Flight Crew Operations Manual
Reports
A REPORT prompt on each page downlinks a unique report applicable to that page. The pages below contain report prompts.

Report Status
Below is a typical sequence of status in response to sending a report.

Automatic Downlinks
The FMC can be configured by the airline to automatically transmit downlinks of FMC data at predetermined points during the flight or in response to specific information requests from the airline dispatcher. The FMC response in these cases is completely automatic and no crew action is necessary.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Company Data Link 737 Flight Crew Operations Manual

Uplinks
Uplinked data may be loaded automatically or may require flight crew action. Three uplinks automatically load data into the FMC when the REQUEST prompt is selected and do not require execution.
Uplinked data that waits in system memory for flight crew action are considered to be pending. A pending uplink is included or discarded when the flight crew selects the applicable prompt. Flight crew response to an uplink depends on the type of uplink. Flight crew action is made with ACCEPT/REJECT or LOAD prompts, FMC modification ERASE prompt or EXEC key, or when the page with the uplink is selected.
Data can be uplinked from the airline dispatcher directly to the FMC. The uplinks are annunciated to the crew by the FMC alert lights. The uplink is identified by a CDU scratchpad message.
PERF INIT uplinks are available only on the ground and after an origin airport has been entered on the RTE page.
RTE DATA cruise winds are available when not in descent and a cruise altitude and a flight plan route exist.
DES FORECASTS winds are available if a cruise altitude exists.
Long Delete Function YA801 - YA809, YC411 - YD655
During uplink, CDU keys are ignored until data is loaded into the FMC. The uplink may be suspended by pressing and holding down the DEL key for at least one second. For all uplinks, except SUPP NAV DATA uplinks, the loaded data is then removed from the flight plan and placed back into the ready to be loaded state.Uplinks that do not generate a modified plan are reloaded when there has been no CDU pushbutton activity for 30 seconds. Uplinks that do generate a modified plan can be reloaded using the LOAD prompt on the appropriate page.
When the long delete is used during a SUPP NAV DATA uplink, the uplink is suspended, but the data loaded up to that point remains in the database.After 30 seconds of keyboard inactivity, the remaining data is loaded.
Copyright . The Boeing Company. See title page for details.
11.33.4  June 1, 2005

Flight Management, Navigation -Company Data Link 737 Flight Crew Operations Manual
Requests
A REQUEST prompt on each page downlinks a unique request applicable to that page. The pages below contain request prompts.

Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Company Data Link

Request Status
　
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