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.
Larry Troyer, Duncan Aviation Avionics Instrument Tech Rep, troubleshoots the two most common causes of APS-80 Autopilot System failure.
Honeywell issued a second revision to Service Bulletin AS907-72-9045 giving instructions on the installation of an improved annular ball (tower shaft) bearing.
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.