cessna-172-training-supplement

G1000 Failures & Partial-Panel Approaches
Training Considerations
For partial-panel training and checkrides, the two most common training
scenarios are PFD failures and ADAHRS failures.
• PFD Failure: Simulate by dimming the PFD screen. The student
should respond by pushing the DISPLAY BACKUP button to activate
reversionary mode and move the flight instrument displays to the
MFD. All instrument procedures remain available. Use the Inset Map for
situational awareness.
• ADAHRS Failure: The ADAHRS has various failure modes that can cause
one or more instrument indications to become unavailable. To simulate
a worst-case scenario in which all of the G1000’s flight instruments are
unusable, dim the PFD screen and do not activate reversionary mode.
Then, fly the airplane using the standby instruments. The MFD should
remain on the moving map screen for situational awareness. GPS
approach procedures remain available. Set the MFD fields to TRK, DTK,
XTK, and DIS to maintain situational awareness of your position relative
to the intended track (in lieu of the CDI).
Other failure modes in which some (but not all) instruments are unavailable can
be simulated using paper or foam cutouts that hang from the COM and NAV
knobs and cover up particular areas of the PFD screen. ATP does not provide
these cutouts.
NOTE: The simulation of failures by pulling circuit breakers is
prohibited in ATP aircraft. Cessna, Garmin, and the FAA all advise
against pulling circuit breakers as a means of simulating failures
on the G1000 system. Pulling circuit breakers, or using them as
switches, has the potential to weaken the circuit breaker to a
point at which it may not perform its intended function.
LRU Failures
If an LRU or an LRU function fails, a red or amber X is displayed over the
window(s) corresponding to the failed data. If this occurs, follow the appropriate
emergency checklist. Generally, this involves checking the circuit breaker for the
affected LRU, then (if the problem is not fixed by resetting the breaker) using the
standby instruments to exit IFR conditions and land as soon as practical.
Aircraft Systems • 13