Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 4-23
190-00716-01 Revision 4
4.10 G1000 Redundant Connection Check
NOTE
Throughout this check prior to the 0985.07 software version, indicators showing “GDC
74” are applicable to the GDC 7400 air data computers.
Perform the following steps to verify the following:
(A) The primary (PRI) and secondary (SEC) power sources for GIA 1, GRS 1, PFD 1, and GDC 1
(B) The AHRS and ADC data path to PFD
(C) PFD and MFD Ethernet connection (includes ARINC connection between ADC and MFD and
DISPLAY BACKUP button function)
(D) Engine data availability to the displays and GPS data availability to the AHRS with either GIA
inoperative
(A) PRI and SEC power sources for PFD 1, GIA 1, GRS 1 and GDC 1 check
1. Connect a ground power unit to the external power receptacle and turn on the ground power unit.
2. Set the BAT, EXT PWR and AVIONICS MASTER PWR switches to ON.
3. With the G1000 system in normal mode, pull the following circuit breakers on the right hand circuit
breaker panel:
• PFD 1 (PRI)
• AHRS 1 (PRI)
• ADC 1 (PRI)
• GIA 1 (PRI)
4. Wait at least 5 seconds, then verify the data on PFD1 remains valid and the following alert messages
are not present:
• GIA 1 FAIL (or any related message such as COM1, NAV1, XPDR1, GPS1)
• AHRS 1 FAIL
• ADC 1 FAIL
• FAILED DATA PATH
5. Close the circuit breakers listed in step 3.
6. Repeat step 4.
7. Pull the following circuit breakers on the right hand circuit breaker panel:
• PFD 1 (SEC)
• AHRS 1 (SEC)
• ADC 1 (SEC)
• GIA 1 (SEC)
8. Wait at least 5 seconds, then repeat step 4.
9. Close the circuit breakers listed in step 7.
(B) AHRS and ADC data path check
1. Verify there are no AHRS loss of data messages, such as:
• AHRS not receiving any GPS information
• AHRS not receiving backup GPS information
• AHRS using backup GPS source