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FLIGHT OPERATIONS WITH VOLCANIC ASH
Applicable to: ,
Avoid flight into areas of known volcanic activity.
If a volcanic eruption is reported while the aircraft is in flight, reroute the flight to remain well clear of
the affected area (volcanic dust may be spread over several hundred miles). If possible, stay on the
upwind side of the volcano (at least 20 nm upwind of it if it is erupting).
In hours of darkness or in meteorological conditions that obscure volcanic dust, one or several of the
following phenomena indicate that the aircraft may be flying into ash cloud:
• smoke or dust in the cockpit,
• acrid odor similar to electric smoke,
• at night, the appearance of St. Elmo fire and static discharges around the windshield,
• bright white or orange glow appearing in the engine inlets,
• sharp, distinct beams from the landing lights,
• multiple engine malfunctions, such as rising EGT decreasing, power, stall or flame out.
If the aircraft enters a volcanic ash cloud:
ESCAPE MANEUVER (terrain permitting)........................................................................ INITIATE
Because the lateral dimensions of ash cloud are not known, the pilot should if possible turn
180 °.
ATC....................................................................................................................................NOTIFY
A/THR......................................................................................................................................OFF
This will prevent thrust variations.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
ADVERSE WEATHER - OPERATIONS IN VOLCANIC ASH, SAND OR DUST
A330/A340 FLEET PRO-SUP-91-40 P 6/8
FCOM 19 AUG 10
THRUST (terrain permitting).........................................................................................DECREASE
This helps to maintain the engine stall margin by reducing the amount of ash ingestion and
limiting the EGT. Il also holds the accumulation of molten volcanic ash on turbine vanes to a
minimum. Do not climb, since this increases EGT.
CREW OXYGEN............................................................................................................. ON/100 %
CABIN CREW..................................................................................................................... NOTIFY
PAX OXYGEN................................................................................................................. AS RQRD
Depending on contamination.
ENG ANTI ICE............................................................................................................................ON
WING ANTI ICE..........................................................................................................................ON
PACK FLOW...............................................................................................................................HI
Maximum airbleed gives the engines additional stall margin.
Note: If CARGO VENTILATION system is installed, it is recommended to switch off the
CARGO ISOL VALVES, to prevent a cargo smoke warning being triggered.
APU (if available)..................................................................................................................START
This prepares the aircraft for a starter-assisted engine relight.
ENGINES PARAMETERS...............................................................................................MONITOR
Monitor the EGT carefully to see that it does not go over its limit.
Note: • If the EGT increases up to the limits, an accumulation of molten volcanic ash on the
turbine vanes must be suspected.
This accumulation may be cleared by engine shutdown, then restart.
• If first engine restart attempt is unsuccessful, repeated successive attemps should be
made immediately.
• A successful engine restart may not be possible until the aircraft has exited the
volcanic ashcloud.
• Upon restart, the engine acceleration may be very low and should not be
misinterpreted as a failure to start.
• Consider compressor and turbine blades have been eroded, avoid rapid thrust
commands. An increased fuel flow and EGT may be noticed.
AIRSPEED INDICATIONS.............................................................................................. MONITOR
Volcanic ash may clog the pitot probes. If the airspeed indication is lost or becomes unreliable,
(Refer to STLO-ABN-34 UNRELIABLE SPEED INDIC/ADR CHECK PROC).
Note: Electrostatic conditions may cause communication problems.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
ADVERSE WEATHER - OPERATIONS IN VOLCANIC ASH, SAND OR DUST
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 11(140)
