Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 7-12
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
2 Invalid for 3 consecutive samples (SSM not set to Normal or Functional
Test).
ELSE
3 Set bit to active (0).
(3) The SDU sets bit 19 to inactive (1) in label 270 SDU to ACARS MU/CMU Status Word to
the CMU for the following condition
(a) When CMU 2 is ORTenabled and Label 270 on "Data from CMU 2" is either:
1 Missing for 3.3 seconds.
2 Invalid for 3 consecutive samples (SSM not set to Normal or Functional
Test).
ELSE
3 Set bit to active (0).
(4) The SDU sets bit 20 to fault (1) in label 270 SDU to ACARS MU/CMU Status Word to the
CMU under the following circumstances:
(a) Both of the following conditions are met:
1 Bit 21 of Label 270 SDU to ACARS MU/CMU Status Word to the CMU is
set to fault (1).
2 Bit 29 of Label 270 SDU to ACARS MU/CMU Status Word to the CMU is
set to 1.
OR
(b) If ORT configured to Aircraft Directed Dual Safety SATCOM, Label 272 from all
three TCP inputs is missing or invalid.
ELSE
(c) Set bit to no fault (0).
(5) The SDU sets bit 21 to fault (1) in label 270 SDU to ACARS MU/CMU Status Word to the
CMU for the following condition:
(a) When a SATCOM Cockpit Fault is detected.
ELSE
(b) Set bit to no fault (0).
NOTE: A SATCOM Cockpit Fault is a fault that prevents the SATCOM
system’s ability to provide safety voice and safety data and can be
present on any SATCOM LRU such as the SDU, the antenna and
power amplifier combination, SCM, etc. The SDU has both circuit
switched and packet switched cockpit voice channels therefore to
have no voice both CS (voice) and PS (data) cockpit voice channels
have to have failed.
(6) The SDU sets bit 29 to 1 in label 270 SDU to ACARS MU/CMU Status Word to the CMU
for any of the following condition:
(a) No active ACARS MU/CMU.
(b) Any SATCOM failures prohibiting safety data link services.
DRAFT
3rd rvw Draft as of:
29 January, 2020