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required for the phase of flight. Once power is set to maintain the desired airspeed,
avoid further power changes. Change the thrust setting only in case of extreme
airspeed variation. Remember that a transient increase is always more advisable
than a loss in speed, which decreases buffet margins and is difficult to recover.
SUPPLEMENTARY PROCEDURES
Flight in Turbulence
Vol. 1 06−15−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
2. TURBULENCE PENETRATION (CONT'D)
• Select CONT IGNITION to ON. This action will reduce the possibility of flameout
due to engine instability. Once out of the area of turbulence, deselect CONT
IGNITION unless required further.
6. FLAPS/SPOILERS
• Flaps extension in an area of known turbulence should be delayed for as long as
possible, because the airplane can withstand higher gust loads in the clean
configuration. If severe turbulence persists in the area, consider diverting to the
alternate station.
• Whenever the flight spoilers are employed, keep hand on the flight spoilers lever
unless it is necessary to remove hand in order to perform some other specific
function.
7. PASSENGER/CABIN CREW CONSIDERATIONS
• Whenever possible, advise the passenger cabin before or shortly after take-off of
anticipated enroute turbulence, so that they can plan their activities accordingly.
• When mild turbulence is encountered, turn on the ‘Fasten Seat Belt’ sign and
advise the passengers over the PA system of light turbulence and request that they
fasten their seatbelts.
• If other than mild turbulence is encountered, turn on the ‘Fasten Seat Belt’ and ‘No
Smoking’ signs. Make an announcement over the PA system and advise the
passengers of the expected rough air and request that they fasten their seatbelts
snugly. After passing through the area of turbulence, turn off the ‘No Smoking’ sign
and make a PA announcement that the flight is clear of the area of turbulence. The
‘Fasten Seat Belt’ sign may then be turned off.
SUPPLEMENTARY PROCEDURES
Flight in Turbulence
Vol. 1 06−15−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
1. GENERAL
Flight operations in areas of known volcanic activity should be avoided. This consideration is
most important during hours of darkness or daytime instrument meteorological conditions, when
volcanic ash/dust clouds may not be visible.
Flight planning considerations should include the review of pertinent NOTAMs, PIREPs and other
directives concerning the status of volcanic activity, when a flight is planned into areas of possible
volcanic activity. When volcanic activity is currently reported, remain well clear of the area, or, if
possible, stay on the upwind side of the volcanic ash.
2. DETECTION
The airplane’s weather radar is not capable of detecting volcanic ash/dust clouds and is therefore
not reliable under these circumstances. The presence of volcanic ash/dust may be indicated by:
• Smoke or dust appearing in the flight compartment.
• An acrid odor similar to electrical smoke.
• Multiple engine malfunctions such as power loss, fluctuating RPM, stalls, increasing ITTs,
flameouts, etc.
• At night, static discharges (also known as Saint Elmo’s fire or Saint Elmo’s light) can be
observed around the windshield and/or windows, accompanied by a bright orange glow in
the engine inlets.
3. EFFECTS
Flight into volcanic ash/dust clouds can result in the degradation of airplane and engine
performance. The adverse effects of volcanic ash/dust encounters are as follows:
• Rapid erosion and damage to the internal components of the engines.
• Ash/dust build-up and blockage of the guide vanes and cooling holes, which can cause
surge, loss of thrust and/or high ITT.
• Ash/dust blockage of the pitot system, which can result in erratic airspeed indications.
• The abrasive properties of volcanic material can cause serious damage to the engines, wing
and tail leading edge surfaces, windshields, landing lights, etc.
• Volcanic ash/dust can also cause the windshield to become translucent, effectively reducing
visibility.
4. CORRECTIVE ACTIONS
The best course of action to take is still avoidance. However, volcanic ash/dust clouds may
sometimes extend for hundreds of miles and an encounter could be unavoidable. As
previously stated, volcanic ash/dust can cause engine malfunctions, and the need to exit the
area as quickly as possible cannot be overemphasized.
If an inadvertent encounter is experienced, the following procedures are
　
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