Columbia 400 - Left or Right Bus Failure;Crosstie Discharges Working Bus; Electric Trim;Autopilot Failure

Section 3
Columbia 400 (LC41-550FG) Emergency Procedures
Initial Issue of Manual: December 9, 2005 RC050005
Latest Revision Level/Date: C/10-10-2006 3-11
6. Good Alternator⎯ ENSURE PROPER OPERATION (If the “Alt Off” message is displayed,
reduce loads or increase RPM until the annunciation clears and the batteries are in a charging
state.)
7.
Electrical System ⎯ If the electrical system is not restored, land as soon as practicable.
LEFT OR RIGHT BUS FAILURE/CROSSTIE DISCHARGES WORKING BUS
(Activating the crosstie switch causes the current sensor of the working bus to discharge
significantly, e.g., the left bus was showing a positive charge prior
to activating the crosstie switch.)
1.
Crosstie Switch ⎯ OFF
2. Master Switch of the failed bus ⎯ OFF
3.
Review the following table for items that are on the failed bus and make appropriate
allowances.
ITEMS UNAVAILABLE WITH A BUS FAILURE
Left Bus Items Right Bus Items
Aileron Trim
Pitot Heat
SpeedBrakes
Position Lights
Landing Light
Left Voltage Regulator
Fan
Strobe Lights
Taxi Light
Right Voltage Regulator
Door Seal/Power Point
Carbon Monoxide Detector
Oxygen
Display Keypad
Air Conditioning
4. Depending on which bus failed (left or right) and the dictates of the current conditions, i.e.,
day, night, IMC, VMC, land the airplane as soon as practicable or possible.
ELECTRIC TRIM/AUTOPILOT FAILURE (sudden and unexplained changes in control stick
force.)
1. Flight ⎯ MANUALLY CONTROL THE AIRCRAFT
2.
Red Autopilot Disconnect/Trim Interrupt Button on Control Stick– PRESS
3.
A/P Trim System Switch in Overhead ⎯ OFF
4. Power Settings ⎯ REDUCE TO 50% BHP OR LESS (Or to a setting that relieves forces.)
5.
Airspeed ⎯ 100 to 110 KIAS (Or to speed that relieves forces.)
6.
Circuit Breakers ⎯ PULL AS REQUIRED
7. Flight⎯ TERMINATE AS SOON AS PRACTICABLE OR POSSIBLE (This depends on the
magnitude of control force(s) required to maintain a normal flight attitude.)
8.
Landing⎯ PREPARE FOR CONTROL FORCE CHANGES (When power is reduced and
airspeed is reduced, there can be substantial changes in the required control pressures.)
WARNING
In a runaway trim emergency the two most important considerations are
to (1)
IMMEDIATELY turn off the trim system and (2) maintain control
of the airplane. The airplane will not maintain level flight and/or proper
directional control without pilot input to the affected flight control(s). If
excessive control force is required to maintain level flight, land as soon as
possible. Pilot fatigue can be increased significantly in this situation with
the potential for making the landing difficult.