Chapter 1
8500C/8500C+ System Maintenance Manual 1-1
1.
Introduction
Section 1.1  About This Manual............................................................................................1-1
Section 1.2  System Purpose And Function ..........................................................................1-1
Section 1.3  System Physical Description.............................................................................1-2
Section 1.4  Leading Particulars ..........................................................................................1-7
Section 1.5  Related Publications.........................................................................................1-7
1.1 About This Manual
1.1.1 Purpose and Function
This manual contains maintenance instructions at the field replaceable component level for the 
Chadwick-Helmuth 8500C/C+ Balancer/Analyzer Systems. Operating instructions are provided only 
to the extent needed to test the system.
1.2 System Purpose And Function
The 8500C/C+ Balancer/Analyzer system is used for both balance/track operations as well as vibration 
analysis. System uses:
• Track and balance helicopter main and tail rotors. 
• Balance propellers.
• Balance shafts and blowers. 
• Balance high-bypass fans.
As a vibration analyzer, the system can be used for:
• On-condition maintenance through vibration trend analysis.
• Pre- and post-maintenance documentation.
• Hardcopy record-keeping of vibration on new or overhauled aircraft.
• Vibration data collection for the VibraLog System.
• Vibration troubleshooting.