The following was released by Cessna to all Operators of Citation Aircraft.

Cessna - On Ground Operations for Volcanic Ash Fallout

Operation from or to airports contaminated with volcanic ash should be avoided if possible. Should volcanic ash exposure be unavoidable, Cessna recommends utilizing the following procedures for Citations:
Note: Operators may use their discretion in determining which actions to take if the airplane is placed in a hangar.
If aircraft cannot be placed in a hangar, complete the following:
Caution: It is not recommended to use clear or aircraft color matching vinyl tape in the applications used in the procedures below.
• Refer to Chapter 10 in the applicable maintenance manual for parking and mooring procedures
• With an auxiliary power source or hydraulic mule, make sure the speed brakes are stowed, flaps are set at 0 degrees, and the thrust reversers are stowed
• Set the flight controls gust lock (if applicable)
• Install engine inlet and exhaust, and pylon inlet covers
• Install pitot tube covers
• Install windshield cover (if available)
• Cover air conditioner inlet and exhaust openings (if applicable)
• Cover Auxiliary Power Unit (APU) inlet and exhaust openings (if applicable)
• Cover Air Cycle Machine inlet and exhaust openings (if applicable)
• Apply colored vinyl tape over all static ports
• Apply colored vinyl tape around the cabin door, escape hatch, and baggage door(s)
• Apply colored vinyl tape to all ram air opening(s) on fuselage
• Apply colored vinyl tape to seam between radome and fuselage
• Apply colored vinyl tape to seams between air inlets and engine cowlings
• Apply colored vinyl tape to seams between thrust reverser and engine cowlings
• Apply colored vinyl tape to inlet and exhaust ports on engine cowlings
• Apply colored vinyl tape to openings around thrust reverser hydraulic actuators
• Apply colored vinyl tape to cover speed brakes
• Apply colored vinyl tape to seam between the wings and ailerons, including hinge points
• Apply colored vinyl tape to seam between the wings and flaps, including rollers or hinge points
• Apply colored vinyl tape to seam between horizontal stabilizers and elevators, including hinge points
• Apply colored vinyl tape to seam between vertical stabilizer and rudder, including hinge points

If volcanic ash settles on aircraft, complete following:
• Refer to Chapter 12 in the applicable maintenance manual for external cleaning procedures
• Thoroughly wash the airplane using care to keep the ash out of all aircraft openings and lubricated parts
• Remove all vinyl tape and covers from the aircraft
• Refer to Chapter 10 in the applicable maintenance manual for return to service procedures

Questions, please contact:
Customer Service Hot Line
1-800-835-4090
316-517-6261 (International)
hotline@cessna.textron.com