What does the incrementing 4 digit number (above the middle push button at the bottom of the DDI) in the support and tactical pages of the DDI mean?

[JoeAce]

Could not find the meaning of this 4 digit number in the flight manual.  Does anybody know the answer to this?

[razo+r]

Mission time since startup or around there.

[JoeAce]

Is that in the flight manual?

[JoeAce]

I don't understand how the 4 digit number can be considered as mission time.  For example:  4311 <--  how do you interpret this as mission time?

[razo+r]

43min and 11 seconds since startup

[Wiz]

Aircraft system time in the MMSS format used for Post Flight tape debriefs.

[Frederf]

MMSS since first engine generator came online. It wraps around to 0000 after 5959. You don't see it displayed until after takeoff. If you start hot there's some randomization code in there.

Edited September 5, 2021 by Frederf

[FightsOn]

It’s not since engine start.  It’s Zulu time in minutes seconds.  It’s called TISM.

[Tholozor]

1 hour ago, FightsOn said:

It’s not since engine start.  It’s Zulu time in minutes seconds.  It’s called TISM.

Isn't TISM a Rhino thing? Legacy NATOPS section 2.13.4.2.1 describes the MENU option replaced with the system time with weight off wheels. Unless system time is synonymous with Zulu in this case.

Edited September 8, 2021 by Tholozor

[Jenson]

2 hours ago, Tholozor said:

Isn't TISM a Rhino thing? Legacy NATOPS section 2.13.4.2.1 describes the MENU option replaced with the system time with weight off wheels. Unless system time is synonymous with Zulu in this case.

 

 

May I further ask on which occasions will the Elapsed Time count being used (the one below the bingo fuel setting), as sometimes I used this ET right before takeoff to count the time elapsed after takeoff. 

[Frederf]

6 hours ago, FightsOn said:

It’s not since engine start.  It’s Zulu time in minutes seconds.  It’s called TISM.

Then DCS is in error. I did a cold start on the runway, started the airplane and took off, and noted the time. The time was something like 2:58. I took the current time in mission and then subtracted 2:58 from it. Then I went back to the track replay to see what happened at T-2:58. It was the exact moment the engine generator cut in on the #1 engine.