Viper 4040 User Manual7 Fan Balance – 7-197.1.16. The Tach Power may also be checked from the Main Menu option “Test TachPower” as shown below. Highlight the “Test Tach Power” item and press[ENTER] to access the “Tach Power” screen.7.1.16.1. Each function key on the “Tach Power” screen corresponds to a Tach channel. Bypressing the corresponding function key, power will be routed to that tach channelfor testing or alignment purposes. Only one tach channel can be powered at a time.The powered tach will be identified following the “Tach Power:” statement. Toturn off power to any tach channel press [F5] “Off”. Exit the “Tach Power” screenby pressing [ENTER] or [BACKUP]. Tach power will automatically be turned offto all channels when the screen is exited.7.1.17. Start Aircraft. The “Start Aircraft” banner screen, shown below, will be displayedwith several informational messages. The Run number indicates which run of thebalance job is currently being collected. The second line states “Perform FODcheck, start engine(s) per flight manual and set engine(s) to idle.” Before startingthe engine, make sure all previously installed trim balance jobs have been removed.
