page 38
July 01/2008
Effectivity: 914 Series
Edition 2 / Rev. 0
d04276
INSTALLATION MANUAL
BRP-Rotax
Stützscheibe
Zelle
Gummi
distance tube
support washer
shock mount
Distanzrohr
airframe mount
Fig. 12
07600
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.
◆ 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.
▲ WARNING: The rubber mounts to neutralize vibrations and all the engine suspen-
sion 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.
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