Embraer EMB145, Operation Manual

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SUPPLEMENTARY
PROCEDURES
ENVIRONMENTAL
AIRPLANE
OPERATIONS
MANUAL
1-02-79
Page
24
Code
01 REVISION 41
Copyright © by Embraer. Refer to cover page for details.
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IN FLIGHT OPERATIONS
Flight operations in volcanic ash are extremely hazardous and must be
avoided. However, volcanic ash/dust clouds may sometimes extend
for hundreds of miles, reaching altitudes above 60000 ft and an
encounter may be unavoidable.
In case of an inadvertent encounter, proceed as follows:
Volcanic Ash Area......................................................... EXIT/AVOID
Consider performing a 180º turn. Due to the dimensions of the Ash
clouds a 180º turn could be the fastest way to exit an Ash cloud.
Oxygen Masks (if necessary)........................................ Don, 100%
If a significant amount of volcanic ash fills the cockpit or if there is a
strong smell of sulphur, don an oxygen mask and select 100%.
APU .............................................................................. START
Ignitions......................................................................... ON
Thrust Lever (if altitude permits) ................................... IDLE
Anti-Icing Buttons (engine, wing and stabilizer)............ PRESSED
Ice Detection Override Knob......................................... ALL
This action will increase bleed air extraction from the engines and
further improve the engine stall margin.
ITT................................................................................. MONITOR
If the ITT is still increasing even with the thrust levers in idle:
Affected Engine........................................................ Shutdown
If it becomes necessary to shutdown an engine to prevent
exceeding ITT limits, restart the engine once it has cooled down. If
the engine fails to start, repeated attempts should be made
immediately.
NOTE: A successful start may not be possible until the airplane is
clear of the volcanic ash/dust, and the airspeed and altitude
is within the airstart envelope. Take note that engines can
be very slow to accelerate to idle at high altitudes and this
could be interpreted as a failure to start or as an engine
malfuntion.