Setting BIT/ACK switch to ACK will not clear MST, MEM,or HOOK status messages from the DU. Engine, FIRE and RPM warnings cannot be cleared from the DU. The faulty unit or warning must be removed from the aircraft. When both engines fail at the same time, en-gine priority is: ENG 1 then ENG 2.
4.4.5.4 Programming Procedure.
NOTE
The programming procedure for the pilot and copilot is identical except for the loca-tion of controls on the CCU.
1.
Select mode to be programmed (1N-4N). The .rst mode that will appear is 1N (normal mode 1).

2.  
P-PGM/CP-PGM/OP switch -P-PGM or CP-PGM.

3.  
PROG blinking in display -Check. Verify that a complete set of symbology is displayed and attitude reference symbol is blinking. Verify PGM is displayed in the HUD FAIL message location for the DU not being programmed.

4.  
BIT/ACK switch -ACK to program the full display or go to step 5 and select desired sym-bols.

5.  
PGM SEL/NXT control -SEL to select sym-bol. Selected symbol stops blinking. If symbol is not desired, toggle switch to NXT and the symbol will disappear.

NOTE
All symbols have been programmed when the PROG annunciator is the only symbol .ashing.
6.  
BIT/ACK switch -ACK. (Hold switch to ACK for one second.)

7.  
OK displayed -Check. (OK will be displayed for two seconds.)

NOTE
If programming is not accepted, FAIL will be displayed. If a FAIL message is dis-played, attempt to reprogram the same mode, if FAIL reappears notify mainte-nance.
Declutter mode is recognized by .ashing ground speed indicator in lieu of attitude ref-erence symbology.

3

2 4
28 7
827
26

12

9 25 10
24 11
22 23 13

19  16
AA9222
18

17  SA
Figure 4-3. Master Mode Display
8.  MODE 1-4/DCLT -DCLT (1D-4D). The .rst 4.4.5.5 Adjustment of Barometric Altitude, Pitch, DCLT mode that will appear is 1D (declutter and Roll. mode 1).
NOTE

If MODE 1-4/DCLT switch is toggled to DCLT a second time the display will cycle back to the DCLT’s normal mode (1N-4N). The MODE 1-4/DCLT switch must be set to MODE 1-4 to advance to another normal mode.
9.
Repeat steps 4 through 7, for declutter.

10.
MODE 1-4/DCLT switch -As required.

11.
Repeat steps 4 through 10 until all desired modes are programmed.

12.
P-PGM/CP-PGM/OP switch -OP.

An improperly adjusted barometric altimeter will result in an improperly set HUD barometric altitude display.
NOTE
Barometric altimeter should be set to the most current altimeter settings, .eld eleva-tion.
1.
Ensure P-PGM/CP-PGM/OP switch is in the OP position.

2.  
ADJ/ON/OFF switch -Pull and set to ADJ.

NOTE

VERSION NUMBER AND DATE WILL CHANGE AS SOFTWARE IS UPDATED.

AA9223
SA

3. ADJ blinking in display -Check.  craft instrument indicator and take the 
NOTE  appropriate action. 
Changes to barometric altimeter settings re-quire a corresponding change to the HUD barometric altitude. Each .01 inch change in  Excessive brightness of the symbology dis-play may impair vision outside the cock-pit. 
pressure equals 10 feet. 4. INC/DEC switch -As required.  Interruption of electrical power, such as change over from APU generator to NO. 1 and NO. 2 generators and vice versa, will cause DU to default to dim and 
5. BIT/ACK switch -ACK. 6. Repeat steps 3 through 5 for pitch and roll. 7. ADJ/ON/OFF switch -ON.  MODE 1N. Any adjustments made to the barometric altitude, pitch and roll prior to .ight will be lost, thereby decreasing the accuracy of the barometric altitude, pitch and roll. 
4.4.5.6 In-.ight Operation.  1. BRT/DIM switch -As desired. 
　
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