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6.4.1 Cleaning Intervals
● The degree of soiling of the combustion air
cleaner depends on the amount of dust
contained in the air and the size of the filter
used. If very dusty air is to be expected, a
cyclone-type precleaner can be fitted to the air
cleaner.
● Consequently, the cleaning intervals cannot be
fixed generally, but have to be determined from
case to case.
● When a dry-type air cleaner is used, when indi-
cated by the service indicator or switch.
● Air cleaner servicing is needed when :
– Service Indicator
the red sector 1 is fully visible when the
engine is off.
– Service Switch
the yellow pilot light comes on when the
engine is running.
● After having carried out service work, reset the
signal by pressing the button of the service
indicator. The service indicator is ready to
resume its function.
Service and Maintenance 6.4 Combustion Air Cleaner
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6.4.2 Dry-Type Air Cleaner
Dust Discharge Valve Filter Cartridge
● Empty dust discharge valve 1 by pressing apart
lips of discharge slot as indicated by the
arrows.
● Clean discharge slot from time to time.
● Remove any caked dirt by pressing together
the upper section of the valve.
● Release fastening clamps 1.
● Take off hood 2 and remove cartridge 3.
● Clean cartridge, replace at least once a year.
● Clean cartridge 3:
– blow through with dry compressed air (max.
5 bar) from inside to outside, or
– in difficult cases, tap out, taking care not to
damage the cartridge, or
– wash out according to manufacturer’s
instructions.
● Check cartridge for damage to filter paper (by
shining the paper through with a light), and
inspect sealing element. Renew if necessaray.
● After having serviced the filter cartridge five
times, or after two years at the latest, renew
safety cartridge 4 (never clean!).
To do this, proceed as follows:
– Undo hex. nut 5 and remove cartridge 4.
– Insert new cartridge, insert and tighten hex.
nut.
● Install cartridge 3, place hood 2 back in
position and secure fastening clamps 1.
!
Never clean filter cartridge with
petrol (gasoline) or hot liquids!
6.4 Combustion Air Cleaner Service and Maintenance
Property of American Airlines
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