UTC/Date INIT

LSK 1L and 1R are active ACARS UTC and Date value under operation. LSK 2L and 2R - A/C UTC & Date are ARINC 429 broadcast data from CMC. LSK 3L and 3R - UTC & Date are manual entry data. LSK 4L and 4R - Uplink UTC & Date are obtained from ground via label 52 UTC Date Request Downlink. User can select ACARS CMU to base its UTC and Date from 3 given sources via LSK 5L and 5R.

Mark II CMU Specifications

Part Number: 998-0758-001 Power Req.: 115 VAC 400 Hz or 28 VDC, 30 W Max. Power interrupt Transparency: 170 msec Size: 4 MCU per ARINC 600 Weight: 12 lbs Max. Dimensions: Height 7.83 inch / Width 5.04 inch / Length 12.76 inch Cooling: Convention; no forced air is needed Temperature: Operating: -55 deg C to +70 deg C / Storage: -55 deg C to +85 deg C Connector: Per ARINC 758 or ARINC 724B Environmental: do-160c Cat A2BABXXXXXXAAAZZUZA3C3XX Reliability: MTDB > 20,000 Hrs Computing Resources: 486DX4 Processor RAM: 2 Mbytes expandable to 8 Mbytes Program Memory: >4 Mbytes expandable to 16 Mbytes Interfaces: 14 ARINC 429 Transmit, 48 ARINC 429 Receive, 32 Discrete Inputs, 16 Discrete Outputs, 1 Aircraft Personality Module, 1 VHF (MSK) Audio, 2 Relay Contacts, 1 ARINC 724 OAT, 1 ARINC 573, 1 PCMCIA