94 Chadwick-Helmuth Company, Inc.
Chapter 5 - General Operation
NOTE: With the
BLADE SPREAD
key set to
<ON>
, the
SPREAD FACTOR
key becomes active. In this case, the user can set
the spacing of the blades by pressing this context key until the user
obtain a correct viewing spread. With the
BLADE SPREAD
key
<OFF>
, the blades are superimposed on each other.
10. When the user is finished, press the
GO BACK
key as many times as
necessary to return to the Main Menu screen.
5.5.2 Main Rotor Balance
Find complete installation instructions for main rotor balance in the
manufacturer’s maintenance manual or the appropriate Chadwick-
Helmuth Model 177M-6A Vibrex Balancer checklist.
Do main rotor balance operations, as follows:
1. Press
TRACK & BALANCE
from the Main Menu screen to acquire a
main rotor balance reading.
2. Operate the aircraft in the run condition specified by the balance
chart. This condition is usually hover for balance measurements and
straight and level for vertical measurements.
3. Select the desired channels (either 1A or 2B) the user wants to read
from.
NOTE: If the user is using lateral and vertical sensors that share
the same magnetic pickup, press the
CHANGE CHANNELS
context
key and choose 1A and 2A for the appropriate two-channel
assignments. These choices are the defaults.
4. Store the readings by pressing
START after they have been acquired.
The user can store up to 50 balance readings (total), after which the
first readings are overwritten.
NOTE: The readings from the Vibrex unit are compatible with the
paper balance graphs used with the Chadwick-Helmuth
Model 177M and Model 8350 Vibrex Balancers.
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