Hpa Status Word - Arinc 429 Label 143; Sdu Modes Of Operations; Power-On Mode - Honeywell ASPIRE-400 System Description, Installation And Maintenance Manual

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
(b)
(c)
(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)
(b)
(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)
(b)
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
Label
Source Destination ID
PA Backoff Range
PA Control
HPA Type
Actual Power Out Status
Max Avail RMS Power
Actual Peak Power
Sign Status Matrix
Parity
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:
EFFECTIVITY
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ASPIRE-400
Recording the occurrence of deassertion to the Event log
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.
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
Recording the absence of detection as an event in the Event log.
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
Recording the occurrence of deassertion to the Event log.
State of Indication of Indicator
Default: 143 Octal
Derived from SDI straps or Manufacturing SDI data in
memory
Derived from Manufacturing data in memory
Defined by states "Carrier On" or "Carrier Off"
Default: "Linear"
Defined by states "Actual Power" or "Held Power"
Default
Defined by the largest forward power sample
Defined by States: "Failure Warning", "No Computed
Data (Command), "Functional Test", "Normal Operation"
Defined by computed Odd parity over word
23-15-49
3rd rvw Draft as of:
29 January, 2020
Page 2-17
22 Apr 2019