INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page 209
November 21, 2008
D. Rotor blade interference test
This test is applicable to rotorcraft installations only, wherein the synchronous interference due to
periodic line-of-sight obstruction by the rotor blades may become perceptible at specific rotor rates.
Proceed to the test first on the ground, and then repeat during a test flight since the interference effects
depend upon the incidence of the blades, as well as upon the rotor rate.
The measurements from the test paragraph B above will serve as a baseline to detect possible rotor
blade interference effects. This baseline should be updated about every half hour. Monitor for
significant changes relative to the baseline data, while varying progressively and slowly the rotor
rotation rate over its operating range.
Should a significant effect be apparent, the rotor rate should be briefly increased or decreased and then
returned to the critical value for a few times, in order to confirm the effect and to eliminate coincidences
and normal noise fluctuations. Beware of extraneous factors such as RF interference from mobile
radios and cellular phones, nearby vehicles and other aircrafts, etc....
A harmful rotor blade interference condition should be declared when the pattern of the effects is found
related systematically to the rotor rate test pattern.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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