Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 125
6.10.6.6 Level 6 Self-Test - Discrete Input Test
Level 6 self-test provides enunciation of any changes in the state of discrete inputs for the defined configuration. Changes in
the state of the actual self-test discrete are not annunciated as it is directly tested in its use to control the test sequences. This
feature is provided for production aircraft testing of discrete input. Level 6 self-test is initiated by pressing the cockpit self-
test button within 3 seconds of the end of level 5 self-test. The results are described in Figure 6.10.6-8.
If state changes occur on any discrete input other than the self-test input, the functional name of the discrete (per the current
configuration) will be annunciated using the string defined in the Installation Design Guide followed by its new state. For
example, if the glideslope cancel discrete input in the current configuration is defined as ground = cancel, and the discrete
transitions from open to ground, level 6 self-test will say: “GLIDESLOPE CANCELED”. If the input is only momentarily
grounded level 6 self-test will say: “GLIDESLOPE CANCELED - GLIDESLOPE ENABLED.”
During level 6 self-test the message “DISCRETE INPUT TEST - PRESS TO CANCEL” is annunciated every 60 seconds.
This provides additional evidence, along with the continued illumination of the INOP lights/fail annunciations, that self-test is
still in progress. As with all self-test levels, if the aircraft goes “In Air”, then self-test is terminated.
During level 6 self-test, a Short Cancel or Long Cancel terminates the self-test level and “END OF SELF-TEST”
annunciated.
START
LEVEL 6
Yes
ANNUNCIATE
"END OF
SELF TEST"
START LEVEL 6
SCAN FOR INPUT
DISCRETE
CHANGES
ANNUNCIATE
DISCRETE THAT
CHANGED
Yes
LONG OR
SHORT
CANCEL
OR "ST C"
No
* EXCEPT SELF
TEST DISCRETE
*DISCRETE
INPUT
CHANGE
No
ANNUNCIATE
"DISCRETE
INPUT TEST
PRESS TO
CANCEL"
ONCE EVERY 60
SECONDS
No
FIGURE 6.10.6-8: LEVEL 6 SELF-TEST