Embraer EMB145 - Page 296

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SUPPLEMENTARY

PROCEDURES

ENVIRONMENTAL

AIRPLANE

PERATIONS

MANUAL

1-02-79

Page

Code

REVISION 41

145/1114

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.

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