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TM 1-6625-724-13&P
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TASK 1 – TEST EQUIPMENT INSTALLATION/CHECKOUT
PROCEDURE 1: AIRCRAFT PREPARATION – Main Rotor
a. Ensure that blade static phasing has been accomplished as per applicable maintenance manual.
b. Check accelerometer type. Select appropriate “AIRCRAFT TYPE” (AH64, AH64NB, AH64D, or AH64D2) from
main screen on CADU. Select manager option (F4), then select SETUP and select ACCELEROMETER. For
AH64 and AH64D script files, verify accelerometer channels 5-14 are defined as “AH64 Acc”. For AH-64NB and
AH64D2 script files verify, accelerometers 1-14 are set to “Wil M991”, or to the type that is being used for the
external wiring of accelerometers.
c.
Ensure that the black paint on the underside of each main rotor blade is uninterrupted from the leading edge to
the trailing edge along the blade span from the start of the swept tip to tab pocket 10 (i.e., no shiny leading edge
visible on the blade bottom). If not, touch up with flat black spray paint, being careful to avoid runs and not over
paint.
NOTE
Track measurements may be in error if the color contrast
of the blade is not consistent in the area that the tracker
sees the blade. Those errors may not be obvious from the
measured track numbers, but they will degrade the
effectiveness of the AVA-computed corrections.
d. Ensure that blades have been correctly and visibly marked as 1 through 4. Blade one is over the nose when the
double interrupter is over the magnetic pick-up. Blade 2 will be on the right, Blade 3 Aft and Blade 4 on aircraft
left as viewed from the pilot’s seat. Ensure that blade tab pockets have been visibly numbered from 0 through 10.
e. Ensure magnetic pickup gap is between 0.030 to 0.070 inches. Check the interrupters to ensure that they are not
deformed.
f.
If new blades have been installed or if previously tracked blades have been installed in different positions, zero
out all trim tabs (pockets 0 through 12) and remove all balance weights.
g. If blades are installed which have been previously tracked together in the same positions, measure and record
trim tab settings. If the trim tabs are bent in a uniform direction, don’t adjust tabs before flying. If the trim tabs are
bent in opposing directions, zero the trim tabs for all blade pockets (0-12). If trim tabs in pockets 0-3 are not 0,
this should be noted for possible future trouble-shooting.
h. If a FM antenna is installed, it should be removed before running aircraft for balance to prevent damage to
antenna. The antenna should be installed when balance is complete.
PROCEDURE 2: EQUIPMENT INSTALLATION (SPU INTERFACE)
Figure 1. Typical AVA Test Setup Configuration
