Fault Message:

IAC 1 BATTERY FAULT

Fault Code:

3151019FW1

Associated CAS:

None

Reporting LRU:	Integrated Avionics Computer (IAC) 1
System Description:	31-40-00
Schematic Diagram:	31-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram:	31-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

The Integrated Avionics Computer (IAC)/Flight Management System (FMS) sets an IAC 1 BATTERY FAULT message on CAIMS in the event the IAC internal Battery wears out prior to being changed.

NOTE: Replacement of the IAC Battery has to be done on site. Sending the IAC to a Honeywell repair shop will incur additional charges for shipping and IAC recertification.

• Integrated Avionics Computer (IAC) 1 (A11)

Advisory Wire/Service Bulletin:

• AW 700-31-0140 - IAC (IC-800) Low Battery Annunciation

Forum Articles/Infoservice/Newsletter:

• TNL A23-1146-001 - Rev 002, IC-800 Low Battery Annunciation and Maintenance

The IC-800 Integrated Avionics Computer, Honeywell Part No. 7017300-6xxxx, has an internal battery, which maintains data stored in Random Access Memory (RAM) when aircraft power is removed from the LRU. The internal battery, which provides maintenance free operation for years in normal service, provides holdup power for the following functions:

• Auto Flight Control System (AFCS) - Integrated Maintenance Test (IMT) RAM
• Electronic Display System (EDS) - Integrated Maintenance Test (IMT) RAM
• Fault Warning Computer (FWC):

  • Integrated Maintenance Test (IMT) RAM
  • Fault Warning Trend/Limit Data RAM
  • Fault Warning CAS Message RAM

• Flight Management System (FMS):

  • Last Known “Present Position”
  • Integrated Maintenance Test (IMT) RAM
  • FMS CUSTOM DB RAM (Custom waypoints and stored flight plans)
  • FMS AIRCRAFT DB RAM (Smart Perf)

NOTE: The NAV Database is not affected by loss of the internal battery.

In the event the internal battery wears out prior to being changed, the data listed above, sometimes referred to as NVM data, will be lost when power is removed from the LRU.While NVM data including all stored fault history may be lost, the LRU will continue to function properly when power is re-applied.The IC-800 has a battery monitor that detects a low battery voltage condition, which is indicated via CAIMS on the AM-200 PMAT and also indicated on the FMS CDU. When a low battery is detected the PMAT will display one of the following CAIMS active faults:

• IAC1 BATTERY FAULT
• IAC2 BATTERY FAULT
• IAC3 BATTERY FAULT

Symptom Text: IAC BATTERY VOLTAGE DETECTED LOW, BATTERY NEEDS TO BE REPLACED.On the FMS CDU, the scratchpad will display: FMS BATTERY MAINT REQD.A low battery condition does not require an immediate maintenance action nor does it limit in any way dispatch of the aircraft. Honeywell recommends the battery be replaced during the next scheduled maintenance, not to exceed 3 weeks, to prevent loss of NVM data.

NOTE: These faults will only be available on aircraft that have a PMAT loaded with Dove.026 or later LDI. The scratchpad message on the CDU displays only if the aircraft is at Batch 2 configuration (IC800 P/N 7017300-6X007) or later.

If battery power is lost the FMS setup options will revert to default settings during the next power-up, and can be reprogrammed before each flight. Other FMS parameters (active flight plan, performance entries, and offside radio commands) are automatically loaded from the cross-side IC-800 when the LRU is powered up and the system comes up in “DUAL” mode. The CUSTOM DB can be manually loaded from the cross-side FMS or re-loaded from diskette (or memory stick) if previously saved via the Data Loader. The AIRCRAFT DB (Smart Perf) can only be re-loaded via diskette (or memory stick).

NOTE: It is recommended a copy of the AIRCRAFT DB be kept onboard the aircraft in the event this maintenance action is required at an out-station.

Replacement of the Internal Battery	AMM 31-41-01-960-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Integrated Avionics Computers (IAC)	AMM 31-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Integrated Avionics Computers (IAC)	AMM 31-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults	AMM 45-45-00-970-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics	AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]

1. Replace IAC internal battery.
2. Do close out.