Honeywell ASPIRE-400 System Description, Installation And Maintenance Manual page 108

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
(2) Based on the ORT, the ACD retrieves and set the ICAO from one of:
(a)
(b)
(3) The first two valid and matching ICAO address labels received after power up on the
ground is stored in non-volatile memory and used until the next on-ground power up.
NOTE:
(4) The SDU considers any of the following ICAO addresses invalid:
(a)
(b)
(c)
EFFECTIVITY
ALL
© Honeywell International Inc. Do not copy without express permission of Honeywell.
ASPIRE-400
AES ID Input (Labels 275 & 276)
CMU (Labels 214 & 216) and enable the associated labels on the identified
interface.
If present, the stored ICAO is used after in-air power ups.
All zeros (0b)
All ones (1b)
ARINC 429 ICAO words with parity errors.
NOTE: The SSM field has intentionally not been included in the validity
criteria. Thus, ICAO information can be processed from ARINC 429
labels with SSM other than Normal Operation.
23-15-49
3rd rvw Draft as of:
29 January, 2020
Page 2-44
22 Apr 2019