Document ID: chunk:federal_register_of_legislation:F2006B11373:body:0:p2
Version: federal_register_of_legislation:F2006B11373
Segment Type: other
Provision Reference: 
Character Range: 3031–4281

depressed;

                  ii.        The master electric power switch is positioned to "OFF";

                  iii.      The autopilot master switch or the radio master switch or the engage/disengage switch on the autopilot controller (as appropriate), is positioned to "OFF" (On some MU 2B aircraft not equipped with an autopilot master switch beside the controller, the radio master switch must be used to disconnect the system in lieu of the autopilot master switch.);

                  iv.      The autopilot circuit breaker is pulled; or

                  v.        When the "GA" go-around switch on the left power lever is depressed on MU 2B aircraft equipped with Sperry SPZ 500 autopilot.

           Note 1: It is very important that the manual pitch trim wheel stops moving after each of the operations of paras 3 or 4b is accomplished.

           Note 2: FAA AD 88-21-01 refers.

 Compliance: Prior to 31 March 1990.

           Background: This AD resulted from a request by the National Transportation Safety Board (US) who while investigating a number of fatal MU 2B accidents, concluded that pilots were becoming confused in the operation of the interrupt/disconnect switches for the electric pitch trim and autopilot systems.