Reference
Modification-No.
- 0 -
Page
63
Date
1996 05 10
Install
914 F
16.2.1) Requirements on the intake air ducting
➪ max. length of ducting 500 mm (20 in.)
➪ min. inside dia. at least outside dia. of the intake socket on turbo charger
➪ min. mean bending radius 100 mm (4")
◆ NOTE: Compression process in the turbo charger will heat up air
considerably, depending on pressure ratio. Usual tempera-
ture rise of 40°C (72°F) at take-off performance.
■ ATTENTION: High engine performance needs air temperature as low as
possible at turbo air intake. Therefore the air filter should be
located in a recess of the engine cowling or separated from
warm air by partitioning such that via on opening ambient air
can be aspirated.
Air temperature above the limit will automatically reduce boost pressure with
consequent performance loss.
◆ NOTE: The automatic back off on boost pressure will protect the
engine against damage by overstressing.
Notes regarding too high air temperatures in the air box:
If in case of high intake air temperature the max. air temperature in the airbox is
frequently or permanently above the limit, the arrangement of air intake has to
be improved or an intercooler has to be installed.
◆ NOTE: Intercooler is not in the supply volume.
Intercooler has to be installed between pressure side of turbo W and inlet E
into airbox.
Requirements on the intercooler:
➪ a minimum flow rate of 300 m
3
/h (390 yd
3
/h) has to be warranted for all
conditions
➪ the pressure loss must not exceed 15 hPa
■ ATTENTION: No additional forces or moments are allowed on turbo
charger or airbox, therefore the intercooler has be supported
independent and free of vibrations.
▲ WARNING: The certification to the latest requirements such as FAR and
JAR has to be conducted by the aircraft builder.
16.2.2) Airfilter
■ ATTENTION: A minimum flow rate of 300 m
3
/h (390 yd
3
/h) has to be
warranted for all conditions.
The pressure loss must not exceed 5 hPa.
▲ WARNING: Use only filter elements which will not tend to restrict the flow
when in contact with water.
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