Central Advisory and Warning System (CAWS 4800) - Indicating and Recording Systems
CAWS 4800 Display Unit 4801 Computer Unit 4802
The Central Advisory and Warning System (CAWS) is a data acquisition, logic processing and display system. It indicates the system status and alerts the crew in the event of an aircraft system malfunction.
The CAWS indicates the system status and alerts the crew to a system malfunction via colored legends situated on an annunciator panel and by voice warnings via the aircraft audio system.
The system consists of two units:
The Computer Unit serves as an interface between the aircraft systems and the Display Unit. In the event of an aircraft system malfunction the failure status will be presented to the pilot/copilot via an illuminated legend on the Display Unit and/or by a voice call-out from the Computer Unit.
The communication between the Computer Unit and the Display Unit is realized by a CAN bus.
Power consumption in normal mode: 1.2 Amp at 27.5 VDC nom
Power consumption in lamp test mode: 2.7 Amp at 27.5 VDC nom
Certifications: Qualification in acc. with RTCA DO 160C
software in accordance with DO 178B
FMEA:
- Computer Unit MTBF = 53668 hours
- Display Unit MTBF = 19355 hours
Working temperature: -55 °C to +105 °C
Signal inputs:
27.5 VDC / GND and OPEN discrete,
26 VAC / 400 Hz control input,
DC under voltage control
Computer unit / display unit communication: CAN Bus
Log book data: Read out with RS 232 data bus.
The housing of CAWS 4801 display unit is a metal housing. The front-side is a LED display with e.g. 48 warning annunciations. The display is realized in aluminum with a black surface and hidden letters. It will be mounted with 4 DZUS-fasteners. The printed foil is under a removable cover.
Connector on display unit: P1 Plug 15 pol. with Pins D SUB.
Weight: 1,200 g
The housing of CAWS 4802 computer unit is a metal housing in 4 MCU dimension.
Connectors on computer unit:
- P1 plug 37 pol. with pins D SUB
- P2 plug 50 pol. with pins D SUB
- P3 plug 10 pol. with pins Series 851
- P4 plug 25 pol. with pins D SUB
Weight: 2,900 g