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 NOTE: 340 seconds was chosen to meet the requirement of 5 minutes
____ minimum. Because the time delay relay has a tolerance of |10%, the actual delay is between 5 min 6 sec and 6 min 20 sec.
 D.  A power supply within the IRU furnishes operating power for the MSU and ISDU. It supplies two status indication signals for the MSU, mode selection signals to the input electronics and a power-up initialization signal for the entire IRS.
 14. IRS Cooling System (Fig. 18)
__________________
 A.  It is important that inertial reference units have an adequate cooling air supply since overheating will result in failure of the IRU's.
 B.  An equipment cooling OFF light is mounted on the P5 overhead panel. This light illuminates amber if the airflow detector detects a no-airflow condition. If the air/ground relay is closed (airplane on ground) a no-airflow condition also causes the ground crew call horn to sound.
 15. IRS Digital Interface (Fig. 19 and 20)
_____________________
 A.  Simplified schematics of the IRS digital interface are shown on Fig. 19 and 20.
 B.  Figure 19 shows the input busses from interfacing components to the two IRUs. The data bus tables on the left indicate the parameters utilized by the IRU from the DADC, the FMC, the ISDU and the DAA.
 C.  Figure 20 shows the three output buses of the IRUs to interfacing components. The table on the right shows parameter information used by each interfacing component.
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IRU BUS DATA INPUTS
INPUT DATA WORDS  SOURCE BUS 
DADC  ISDU  FMC 
041 SET LAT  X  X 
042 SET LONG  X  X 
043 SET MAG HDG  X  X 
203 ALTITUDE  X 
210 TAS  X 
212 ALT RATE  X 

 

DAA BUS DATA INPUT
INPUT DATA WORDS  SOURCE BUS 
FMC 
357 BITE WORD  X 

 

IRS Digital Input Interface Schematic
Figure 19

DATA WORDS OUTPUT  SOURCE BUS & DESTINATION 
IRU-3  IRU-1  IRU-2 
ISDU  DAA  FMC  FCC  A/T  DAA  FCC 
010 PRES POS-LAT  X 
011 PRES POS-LONG  X 
012 GROUND SPEED  X  X 
013 TRACK ANGLE  X 
015 WIND SPEED  X 
016 WIND DIRECTION  X 
044 TRUE HEADING  X 
270 IRU DISCRETES  X  X  X  X  X 
310 PRES POS-LAT  X 
311 PRES POS-LONG  X 
312 GROUND SPEED  X  X  X  X  X  X 
314 TRUE HEADING  X 
315 WIND SPEED  X  X 
316 WIND DIRECTION  X  X 
317 TRACK ANGLE-MAG  X  X  X 
320 MAGNETIC HDG X  X  X  X  X 
321 DRIFT ANGLE  X 
ANGLE 322 FLIGHT PATH  X  X 
323 FLIGHT PATH ACCEL  X  X  X 
324 PITCH ANGLE  X  X  X  X  X  X 
325 ROLL ANGLE  X  X  X  X  X  X 
330 BODY YAW RATE  X  X  X  X 
331 BODY LONG ACCEL  X  X  X 
332 BODY LAT ACCEL  X  X  X 
333 BODY NORM ACCEL  X  X  X 
　
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