Textron Cessna Skyhawk SP - Air Data System Failure; Attitude and Heading Reference System (Ahrs) Failure; Red X - Horizontal Situation Indicator (HSI); Red X - PFD Airspeed Indicator

CESSNA SECTION 3
MODEL 172S NAV III EMERGENCY PROCEDURES
GFC 700 AFCS
U.S.
AIR DATA SYSTEM FAILURE
RED X - PFD AIRSPEED INDICATOR
1. ADC/AHRS Circuit Breakers - CHECK IN (ESS BUS and AVN
BUS 1). If open, reset (close) circuit breaker. If circuit breaker
opens again, do not reset.
2. Standby Airspeed Indicator - USE FOR AIRSPEED
INFORMATION
RED X - PFD ALTITUDE INDICATOR
1. ADC/AHRS Circuit Breakers - CHECK IN (ESS BUS and AVN
BUS 1). If open, reset (close) circuit breaker. If circuit breaker
opens again, do not reset.
2. Standby Altimeter - CHECK current barometric pressure SET.
USE FOR ALTITUDE INFORMATION.
ATTITUDE AND HEADING REFERENCE SYSTEM
(AHRS) FAILURE
RED X - PFD ATTITUDE INDICATOR
1. ADC/AHRS Circuit Breakers - CHECK IN (ESS BUS and AVN
BUS 1). If open, reset (close) circuit breaker. If circuit breaker
opens again, do not reset.
2. Standby Attitude Indicator - USE FOR ATTITUDE
INFORMATION
RED X - HORIZONTAL SITUATION INDICATOR (HSI)
1. ADC/AHRS Circuit Breakers - CHECK IN (ESS BUS and AVN
BUS 1). If open, reset (close) circuit breaker. If circuit breaker
opens again, do not reset.
2. Non-Stabilized Magnetic Compass - USE FOR HEADING
INFORMATION
172SPHBUS-00
3-21