page 38
May 01/2009
Effectivity: 912 Series
Edition 1 / Rev. 1
d04634
INSTALLATION MANUAL
BRP-Powertrain
10.3) General directives for engine suspension
Rubber mounts to be used between engine and aircraft frame to neutralize
vibrations.
Damping elements as generally used in the aircraft industry (e.g. LORD) are
suitable. See Fig. 12.
◆
NOTE:
The Fig. shows rubber mount
Lord J 3608-1 resp. J 3608-2.
▲
WARNING:
All elements to balance out vibrations have to
be of captive design.
Stützscheibe
Zelle
Gummi
distance tube
support washer
shock mount
Distanzrohr
airframe mount
◆
NOTE:
With suspension on the 4 top lugs L3, R3, L4 and R4 only, the
tilting moment due to the pull of the propeller will be avoided
while, if attached on the bottom lugs only, the moment of tilting
has to be taken care of accordingly.
◆
NOTE:
A certified engine suspension frame has been developed by
BRP-Powertrain, especially for the magneto side engine at-
tachment to the fireproof bulk head.
▲
WARNING:
If the engine suspension frame supplied by BRP-Powertrain is
not used the engine installation must by ground run tested to
the specified loads and for vibration behaviour. Certification to
the latest requirements such as FAR or EASA has to be
conducted by the aircraft manufacturer.
▲
WARNING:
The rubber mounts to neutralize vibrations and all the engine
suspension components not in the supply volume must be
ground run tested to the specified loads and for vibration
behaviour. Certification to the latest requirements such as FAR
or EASA has to be conducted by the aircraft manufacturer.
■
CAUTION:
The engine suspension has to be designed to prevent any
excessive engine movement and to minimize noise emission
and vibration on air frame side.
See also SL-912-010 "Identifying abnormal vibrations on
aircrafts", latest issue.
Fig. 12
07600
