Compliance with SB No. 3719 is highly recommended and can be operation critical. Keep reading to determine if the units on your aircraft are affected.
Honeywell issued a second revision to Service Bulletin AS907-72-9045 giving instructions on the installation of an improved annular ball (tower shaft) bearing.
Larry Troyer, Duncan Aviation Avionics Instrument Tech Rep, troubleshoots the two most common causes of APS-80 Autopilot System failure.
Universal Avionics discontinued repair support for the LCD display in the UNS-1 Csp and UNS-1 Csp+ due to obsolete parts.
Bearing loss is not out of the ordinary. However, a small number of engine surges have been reported.