Requirements On The Air Intake System; 1) Requirements On The Intake Air Ducting - Rotax 914 series Installation Manual

16.2) Requirements on the air intake system

▲ WARNING: Carb icing is a common reason for engine trouble. No implements are
▲ WARNING: All items of the air intake have to be secured against loss.
▲ WARNING: The certification to the latest requirements such as FAR and EASA has
Air intake socket (1) on turbo charger
outside dia. ø ........... 60 mm (2 3/8")
slip-on length ......... max. 25 mm (1")
■ CAUTION:

16.2.1) Requirements on the intake air ducting

◆ NOTE:
■ CAUTION:
Effectivity: 914 Series
Edition 2 / Rev. 0
INSTALLATION MANUAL
included in the supply volume for preheating of the intake air.
Because of the generated heat by turbo charging preheating of the
intake air is possibly not necessary. But an alternate air door or flap that
draws air from the engine compartment is recommended as the air filter
could possibly close by formation of ice.
Door or flap must be in front of turbo charger (suction side)!
Preheating of the intake air will result in performance loss because of
the lower air density.
to be conducted by the aircraft manufacturer.
Utilize the full slip-on length on all connection. Secure hoses by suitable
spring type clamp or screw clamp.
- 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")
Compression process in the turbo charger will heat up air
considerably, depending on pressure ratio. Usual temperature
rise of 40 °C (104 °F) at take-off performance.
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. The automatic
back off on boost pressure will protect the engine against
damage from overstressing.
BRP-Rotax
page 98
July 01/2008