Zeke From Hong Kong, joined Dec 2006, 9481 posts, RR: 76
Reply 1, posted (9 years 1 month 2 weeks 20 hours ago) and read 4628 times:
Its called a DCDU - Data Communication Display Unit, you can find them on anything from the 320 series to 380. Its for CPDLC (Controller Pilot Data Link Communications), the pilots "Log On" to the ATC centre and instructions to and from the aircraft are passed to the aircraft via CPDLC instead of voice communications on VHF or HF radio.
The flightcrew is alerted to an incoming message by means of a flashing blue «ATC MSG» light in two pushbuttons on the glareshield, as well as by a dedicated audio sound which is similar to a telephone sound. The alert is stopped by pressing one of these two pushbuttons or by answering the message, directly on the DCDU. For normal messages the buttons flash, and the audio signal is repeated about every 15 seconds (with the first signal delayed by 15 seconds, so as not to multiply audio warnings). The message will appear on the DCDU if the screen is empty. If the screen is not empty, a flashing cue (e.g. «MSG 1/2») reminds the crew of the arrival of the message. For urgent messages the buttons flash, the audio signal is repeated about every 5 seconds, and the message is displayed on the DCDU regardless of the state of the screen.
To reply to a message, the flightcrew either uses the standard replies on the DCDU (WILCO, UNABLE, STANBY, ROGER, AFFIRM, NEGATIVE etc) or composes a reply on a menu-page from the MCDU. After composing the message on the MCDU it is transferred to the DCDU for sending.
We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
FrancoBlanco From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 1 month 2 weeks 9 hours ago) and read 4532 times:
Could it be that Boeings have the same system integrated in the FMC/CDU? While watching the Just Planes DVD about the United 777 I noticed (or it is even mentioned by the captain) that the flightcrew were reading off messages from the CDU from time to time; obviously there were not only ACARS messages but also ATC communication going on (e.g. departure clearance, oceanic clearance).
SNA350 From Belgium, joined Dec 2005, 129 posts, RR: 0
Reply 6, posted (9 years 1 month 1 week 3 days 5 hours ago) and read 4168 times:
Quoting ClearedDirect (Reply 5): Is it my blurred vision or does the EICAS on that pic still show them in CLB (climb) mode?
don't think so it will be CRZ (cruise)
because the alt mode is active on the autopilot (and not the vert speed mode as it would be in a climb) and also the vert speed is zero (you can see that on the PFD on the far right
BuckFifty From Canada, joined Oct 2001, 1316 posts, RR: 19
Reply 10, posted (9 years 1 month 1 week 3 days 2 hours ago) and read 4085 times:
It's actually called an ECAM on the Airbus. And it shows CLB because the thrust levers are in the CLB detent (which is standard for cruise). The percentage figure beside it shows the available thrust while the levers are in this detent.
The mode changes depending on the phase of flight, and the mode and detent that the thrust levers are in.