Users Manual

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EFFECTIVITY
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22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(b) Recording the occurrence of deassertion to the Event log
(c) Define "Command" as the state of indication of "Control Bus Input" of ARINC-
429 label 350 HPA Maintenance word for that and subsequent reporting intervals
until asserted otherwise.
(5) If ARINC-429 label 357 HPA Detector Sample Control word is not detected within the
greater of 1s or +50% of its expected scheduling from the preceding ARINC-429 label
357 HPA Detector Sample Control word then the HPA reacts by:
(a) Identifying "No Computed Data" (Detector) as a ARINC-429 word reportable
SSM condition of the HPA to be applied to ARINC-429 label 357 Aero Power
word
(b) Recording the absence of detection as an event in the Event log.
(6) On the successive detection of ARINC-429 label 357 HPA Detector Sample Control word
in compliance with the expected scheduling ±50ms the HPA reacts as follows:
(a) No longer identifying "No Computed Data" (Detector) as a ARINC-429 word SSM
reportable condition of the HPA to be applied to ARINC-429 label 357 Aero
Power word until identified otherwise
(b) Recording the occurrence of deassertion to the Event log.
B. HPA Status Word - ARINC 429 Label 143
(1) The HPA assigns the state of indication of the various Indicators that define the ARINC-
429 label 143 HPA Status word format in accordance to the Table 2-5:
Table 2-5. States of Indication Assigned to Indicators by HPA
Indicator State of Indication of Indicator
Label
Default: 143 Octal
Source Destination ID Derived from SDI straps or Manufacturing SDI data in
memory
PA Backoff Range Derived from Manufacturing data in memory
PA Control Defined by states “Carrier On” or “Carrier Off”
HPA Type
Default: “Linear”
Actual Power Out Status Defined by states “Actual Power” or “Held Power”
Max Avail RMS Power Default
Actual Peak Power
Defined by the largest forward power sample
Sign Status Matrix Defined by States: “Failure Warning”, “No Computed
Data (Command), “Functional Test”, “Normal Operation”
Parity
Defined by computed Odd parity over word
10. SDU Modes of Operations
A. Power-On Mode
(1) Power-On Mode is entered when power is applied to the SDU and is responsible for:
DRAFT
3rd rvw Draft as of:
29 January, 2020