B10. KCI 310 does not display proper attitude (INS selected).
Defective INS/GYRO switch.
Defective navigation junction box No. 2.
Defective INS computer.
B11. KCI 310 displays excessive difference between GYRO
attitude and INS attitude.
Vertical gyro installed off-level.
INS computer installed off-level.
B12. FAST ERECT switch does not stop gyro tumble.
Open wiring between switch and vertical gyro or switch and
2001-7 in nose avionics compartment.
Defective vertical gyro.
B13. Fuel quantity indicator fluctuates or reads low.
Defective pins in connector on harness that mates with gage.
Defective pins in connector on fuel probes and wing harness used
to connect fuel probes.