1)General Directives For Ducting Of The Cooling Air - Rotax 912 ULS 3 Installation Manual

12.11.1)General directives for ducting of the cooling air

Effectivity: 912 Series
Edition 1 / Rev. 1
BRP-Powertrain
INSTALLATION MANUAL
See Fig. 2/3/4.
For front installation in a closed fuselage, ducting of cooling air to the
cylinders is recommended. In this case a costly horizontal partitioning
(baffles) can be avoided.
◆ NOTE:
The engine remains in this case completely on the
warm side of the engine compartment and is very well
accessible. In special cases a separate cold air supply
to the air intake filters has to be provided.
BRP-Powertrain has developed especially for this application a non-
certified cooling air ducting.
▲ WARNING: Certification to the latest requirements to FAR or
EASA has to be conducted by the aircraft manufac-
turer.
The following recommendations should assist the aircraft manu-
facturer at the planning of a suitable cooling air ducting.
- The cooling air ducting to be adequate to transfer thermal energy
of approx. 6 kW (5,7 BTU/s) at take-off power.
- required cross section of air duct: at least 100 cm
- material:
glass fibre reinforced plastic or heat resistant non-inflammable
material.
- attachment:
formlocking on engine case and cylinders
◆ NOTE:
In case formlocking attachment won`t be adequate,
additional attachment is possible on two tapped lugs
M8 on top side of engine.
2 (16 in 2 )
page 64
May 01/2009