Message Name:

FMS BATTERY MAINT REQD (CYAN) ON SCRATCHPAD

Message Code:	346OBS005
Effectivity:	All
System:	Flight Management System (FMS)
System Description:	None
Schematic Diagram:	None
Wiring Diagram:	None

The Integrated Avionics Computer/Flight Management System (IAC/FMS) sets an FMS BATTERY MAINT REQD message on the /Flight Management System Control-and-Display Unit (FMS CDU) scratchpad in the event the IAC Internal Battery wears out prior to being changed.

NOTE:

• Replacement of the IAC Battery can be done on site. Sending the IAC to a Honeywell repair shop will incur additional charges for shipping and IAC recertification
• 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 Non-Volatile Memory (NVM) data

• Integrated Avionics Computer (IAC) Battery

Advisory Wire/Service Bulletin:

• AW700-31-0140 - IAC (IC-800) Low Battery Annunciation
• AW700-31-0473 - Integrated Avionic Computer (IAC) - No Fault Found (NFF) investigation Conclusions
• AW700-34-0241 - Data Loader DL-950 Loading Erratic
• AW700-34-0348 - Control Display Unit (CDU820) - Intermittent Blanking Display and No Fault Found Update

Forum Articles/Infoservice/Newsletter: None

Honeywell Service Information Letter:

• Honeywell TNL A23-1146-001 Rev 02 - IC-800 Low Battery Annunciation and Maintenance
• Honeywell SIL No. D201105000003 Rev 2 - NZ-2000 Navigation Computer, PN 7018879-03XXX, IC-615 Integrated Avionics Computer, PN 7017000-XXXXX, IC-800 Integrated Avionics Computer, PN 7017300 XXXXX; Flight Management System(FMS) CNTL-D and Hyperstart Procedures
• Honeywell SIL No. D201111000038 Rev 0 - DL-950 Data Loader (DL-950), PN G7226-01 and-02; Release of Gables Service Bulletin, Publication Number G7226-01-34-04 and G7226-02-34-04, Modification (MOD) F to the DL-950
• Honeywell SIL No. D201402000051 Rev 2 - Global Express P-2000XP IC-800/IC-810 Integrated Avionics Computer (IAC), Internal Battery Information and Internal Battery 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 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"
• Date and Time
• PERF Related Aircraft Specific Parameters
• Basic Operating Weight (BOW)
• Flight Crew Preferences (Speed Targets etc.)
• Integrated Maintenance Test (IMT) RAM
• FMS CUSTOM DB RAM (Custom waypoints and stored flight plans)
• FMS AIRCRAFT DB RAM (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:

• IAC 1 BATTERY FAULT
• IAC 2 BATTERY FAULT
• IAC 3 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

NOTE: These faults will only be available on aircraft that have a PMAT loaded with Dove 0.026 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 (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
• Operator should evaluate optional maintenance task per the Maintenance Planning Document (MPD) document for IAC Battery replacement every 15 months, where the interval can be adjusted based on operation

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 ]
Access to Non-Volatile Memory (NVM) Management	AMM 45-45-00-970-822 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Integrated Avionics Computers (IAC)	AIPC 31-41-01-13 [ Global Express ]  [ G5000 ]  [ Global XRS ]

1. Confirm that the battery has low voltage and replace as required AMM TASK 31-41-01-960-801.
   NOTE: In service experience has shown that a low or marginal battery voltage even when not triggering any of battery messages may affect operation of the functions using holdup power listed in the Honeywell SIL D201402000051 Rev 2.
2. Check for the following MDC CAIMS message, to also evaluate a low battery voltage status.
   Select the CAIMS messages:3151019FW1 - IAC 1 BATTERY FAULT3151019FW2 - IAC 2 BATTERY FAULT3151019FW3 - IAC 3 BATTERY FAULT

   1. If the messages are not present, do close out.
   2. If the messages are present, continue with next step.

3. Troubleshoot the messages.
4. Do close out.

Post Battery Replacement:

NOTE: In the event of a failure related to Navigation Database and Aircraft Database (ACDB) upload procedure/ problems, check AW700-34-0241 latest revision for further information.

If IAC intermittent failures are present or problems with the databases are still present:

1. Perform an HYPERSTART (Honeywell SIL No. D201105000003 Rev. 2) in order to reset IACs internal RAM. Since the battery holds up different RAMs in the IAC, the battery could be related to the corruption.
2. Field experience shows that sometimes intermittent failures have been cleared through IAC NVMs erase. The following are IMT messages associated with intermittent failures, shown in CAIMS Active Faults, that can be cleared through IAC NVMs erase:

   • "FMS 1 inop"
   • "external ascb fault"
   • "external monitor fault"
   • "SG Inop"
   • "iac/ext clk interface"
   • "IAC/LX ARINC intfc"
   • "external monitor fault"
   • "FMS-invalid-IAC fault"

NOTE:

• Prior to erasing a NVM it is always suggested to download and save its content
• The procedure that should be always followed is the AMM Task 45-45-00-970-822
• Operators should also keep in mind, that in order to avoid any sort of NVM download issues, it is recommended to start CAIMS before launching the NVM download software and to keep it open until the NVMs’ download is completed