System Operation; General; System Overview; Modes Of Operations - Honeywell ASPIRE-400 System Description, Installation And Maintenance Manual

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
1.

General

A.

System Overview

(1) The Aspire 400 SDU/SCM/HPA (Satellite Data Unit/ SDU Configuration Module/ High
Power Amplifier) subsystem is part of the Aircraft Earth Station (AES) that facilitates
airborne satellite communications using Swift Broadband (SBB) services over the
Inmarsat L-Band satellite communications network.
2.

Modes of Operations

A.

Modes of Operation Transition Path

(1) The modes of operation begins with "Power On" where the OS boots
(2) The SDU begins its configuration and testing based on the ORT loading operational
software where the SDU then boots up and begins validation
(a)
(3) The SDU will then have the option for several tests and checks:
(a)
(4) At all steps in the process, except for the Aircraft Test Mode, data is sent to be checked
against the ORT and is either sent back to the SDU configuration and testing or the
process is interrupted and the data load progress is reset.
(5) Figure 2-1 provides an understanding of the modes of operation and the possible
transitions between the different modes.
EFFECTIVITY
ALL
© Honeywell International Inc. Do not copy without express permission of Honeywell.
ASPIRE-400
SECTION 2 – SYSTEM OPERATION
If the validation fails then the system begins a safe power shut down:
1 Data load command signal will begin a load progress reset
2 SDU configuration or ORT operation software must be fixed.
Maintenance Test Command which places the system in Aircraft Test Mode,
once finished, the system returns to SDU Configuration is supported and the
application is loaded for the Inmarsat configuration services. The system can
now enter Aircraft Test Mode.
23-15-49
3rd rvw Draft as of:
29 January, 2020
Page 2-1
22 Apr 2019