Honeywell International Inc. DMA-37B2 Manuale Utente

Page 1010

10 Oct 2007

DMA-37B DME System

© Honeywell International Inc. Do not copy without express permission of Honeywell.

(1) The maintenance mode is entered from either one of the two Test Complete screens 

(Figure 1004 or Figure 1005). The maintenance mode allows troubleshooting of all 

components of the DMA-37B DME System, both internal and external.

(2) All pages have the MORE selection on the right key.

• MORE

Pressing this key cycles through all of the maintenance pages. When on 

the last page, the MORE key causes a return to the first displayed 

maintenance screen.

(3) All pages have the RETURN selection on the left key.

• RETURN Pressing this key causes the system to return to the Normal Mode 

screen (Figure 1001).

(4) There is no timeout in the maintenance mode when the aircraft is on the ground. But, 

while in the air, not pressing a key for five minutes causes the system to return to the 

Normal Mode screen (Figure 1001).

(5) Figure 1015 thru Figure 1021 show typical maintenance-mode pages that can be 

encountered.

(6) In Figure 1016, row one, PORT X will be either PORT A or PORT B. Lines 2 thru 7 

display the status of up to six tuning words by showing the contents of their SSM, Mode, 

Ident, Display, and Frequency fields. Mode 0 thru 5 frequencies are displayed if a Mode 

0 (standby) frequency is being received. If the DMA-37B is not in standby, then Mode I 

thru 6 frequencies will be displayed. Column six displays either  I, D, or B, when the Ident 

bit is on, when the Display is on, and when both Ident and Display bits are on, 

respectively. If the selected port does not meet the minimum total update rate check for 

Default Mode then all fields display X.
NOTE: The Status field displays FAILED if either an external or an internal failure is 

detected.