Sennheiser SI 234 - ANNEXE 802 Operations Instructions download pdf (Page 157)

100

101

DA 42 NG AFM

Emergency

Procedures

Doc. No. 7.01.16-E Rev. 3 01-Apr-2014 Page 3 - 73

3.12.9 AUTOPILOT OR ELECTRIC TRIM MALFUNCTION / FAILURE

NOTE

An autopilot or electric trim malfunction may be recognized

by an unexpected deviation from the desired flight path,

abnormal flight control or trim wheel movement, or flight

director commands which cause unexpected or contradictory

information on the other cockpit displays. It may be

accompanied by the aural autopilot disconnect tone, a red

AFCS, red PTCH, red ROL, red YAW, red AP or yellow AP

indication on the PFD, or a yellow CHECK ATTITUDE on the

PFD. The autopilot and AHRS monitors normally detect

failures and automatically disconnect the autopilot.

Failure of the electric pitch trim, indicated by a red boxed

PTRM flashing on the PFD, may not cause the autopilot to

disconnect. Be alert to possible autopilot out of trim conditions

(see AUTOPILOT OUT OF TRIM procedure below), and

expect residual control forces upon disconnect. The autopilot

will not re-engage after disconnect with failed pitch trim. If

AUTOPILOT OUT OF TRIM ELE indication is present, expect

substantial elevator forces on autopilot disconnect.

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Sennheiser SI 234 - ANNEXE 802 Operations Instructions Page 157

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