CMC electronic Esterline CMA-5024 User Manual

INSTALLATION MANUAL
CMA-5024 GLSSU
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Page A.3
November 21, 2008
1.1.2.1 Functional/Guidance Test Discrete input
The GLSSU reads the Functional/Guidance Test discrete input pin and determines its state as defined
below:
- Discrete pin open indicates no Self-Test / Guidance Test request.
- Discrete pin at Ground indicates a Self-Test / Guidance Test request.
The GLSSU reacts to changes in the Functional/Guidance Test Discrete input within a one second
period.
1.1.2.2 Tune/Guidance Test Inhibit Discrete input
The GLSSU reads the Tune/Guidance Test Inhibit Discrete input pin and determine its state as defined
below:
- Discrete pin at Ground indicates that the GLSSU inhibits approach selections and guidance test
requests.
- Discrete pin open indicates that the GLSSU allows approach selection and guidance test requests.
The GLSSU reacts to changes in the Tune/Guidance Test Inhibit Discrete input within a 50 ms period.
Note: This input is typically feed from the autopilot, in order to disable the manual tests once the
autopilot is engaged
1.1.2.3 ILS/GLS Source Select Discrete input
The GLSSU reads the ILS/GLS Source Select Discrete input pin and determine its state as defined
below:
- Discrete pin open indicates that the ILS and DME input data is passed-through by the HIS.
- Discrete pin at Ground indicates that ILS and DME input data is selectively substituted by ILS/DME
look-alike data computed internally by the GLSSU.
The GLSSU reacts to changes in the ILS/GLS Source Select Discrete input within a one second period.
1.1.2.4 APD Select Parity Discrete input
The GLSSU read the APD Select Parity Discrete input pin and determine its state as defined below:
- Discrete pin open indicates a logical 0
- Discrete pin at Ground indicates a logical 1
The APD Select Parity validates the GLSSU SDI and the APD Select settings, if enabled by the APD
Parity Discrete Check APD setting. Refer to Appendix E.
The state of the APD Select Parity Discrete is determined only during Self-Test mode; later state
changes will not be detected.
Caution: The GLSSU will not operate if the APD Select parity Discrete input is incorrect.
Note: The APD Select Parity pin (J3-16) must be set so that the number of the APD Select Parity
pin, APD Select Parity pins (J3-14, 15, 45, 66), and SDI pins (J1-5, 36) being connected to
ground is odd. A pin connected to ground indicates a logical "1"; a pin left opened indicates
a logical "0". For example, for APD = 0 (pins J3-14, 15, 45 and 66 opened) and SDI =
Center Unit (pins J1-5 and 36 grounded), J3-16 must be grounded. Conversely for APD= 2
34-52-81-1
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CMC electronic Esterline CMA-5024 Specifications

General

Brand	CMC electronic
Model	Esterline CMA-5024
Category	Accessories
Language	English