Figure 7-73.  AHRS unit failed. Figure 7-74  depicts an AHRS and ADC failure. In this failure  scenario, there are no indications of the aircraft’s attitude. The  manufacturer recommends turning on the autopilot, which is  simply a wing leveler.  With a failure of the primary instrumentation on the PFD, the  only references available are the standby instruments. The  standby instrumentation consists of an analog ASI, attitude  indicator, altimeter, and magnetic compass. There is no  standby turn coordinator installed. In extreme nose-high or nose-low pitch attitudes, as well  as high bank angles, the analog attitude indicator has the  potential to tumble, rendering it unusable. The autopilot is equipped with inputs from a turn coordinator  installed behind the MFD screen. This turn coordinator is  installed solely for the use of the autopilot to facilitate the  roll mode, which is simply a wing leveler. This protection  is always available, barring a failure of the turn coordinator  (to aid the pilot if the aircraft attains an unusual attitude). NOTE: The pilot is not able to gain access to the turn  coordinator. This instrument is installed behind the MFD  panel.  [Figure 7-75] Most EFD equipped aircraft are coming from the factory with  autopilots installed. However, the purchaser of the aircraft  can specify if an autopilot is to be installed. Extreme caution  Autopilot Usage 7-58 XPDR 5537 IDNT LCL23:00:34  VOR 1 2  1  1  2  4 3 50 3100  3000  2900  3900  2700  2600  2500  3600  3500  3440000  3300  3200  3100  20 80 28  4100  170  160 150 140 130 120 110 5 134 3 TAS 134KT  OAT 7°C  NAV1 108.00 113.00 NAV2 108.00 110.60 134.000 118.000 COM1 123.800 118.000 COM2 $_{WPT }$_ _ _ _ _ _$_{ DIS }$_ _ ._ $_{NM}$ $_{DTK }$_ _ _$_{°}$ TRK 360° HDG ATTITUDE FAIL  CRS 071°  HDG 273°  TRAFFIC should be utilized when flying an EFD equipped aircraft  without an autopilot in IMC with an AHRS and ADC failure. The autopilot should be utilized to reduce workload, which  affords the pilot more time to monitor the flight. Utilization  of the autopilot also decreases the chances of entry into an  unusual attitude. Flying an EFD-equipped aircraft without the use of an autopilot  has been shown to increase workload and decrease situational  awareness for pilots first learning to flying the new system. The following errors have the potential to disrupt a pilot’s  situational awareness and lead to unusual attitudes. Common Errors Leading to Unusual Attitudes 1.  Improper trimming techniques. A failure to keep the  aircraft trimmed for level flight at all times can turn  a momentary distraction into an emergency situation  if the pilot stops cross-checking. 2.  Poor crew resource management (CRM) skills. Failure  to perform all single-pilot resource management  duties efficiently. A major cause of CRM-related  accidents comes from the failure of the pilot to  maintain an organized flight deck. Items that are  being utilized for the flight portion should be neatly  arranged for easy access. A disorganized flight deck  can lead to a distraction that causes the pilot to cease  cross-checking the instruments long enough to enter  an unusual attitude.