Attitude And Heading Reference System (Ahrs); Red X - Pfd Attitude Indicator; Red X - Horizontal Situation Indicator (Hsi); Display Cooling Advisory - Cessna 172S Skyhawk SP NAV III 2005 Information Manual

SECTION 3
EMERGENCY PROCEDURES
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
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.

DISPLAY COOLING ADVISORY

PFD1 COOLING OR MFD1 COOLING ANNUNCIATOR(S)

1. Cabin Heat (CABIN HT) - REDUCE (minimum preferred)
2. Forward Avionics Fan - CHECK (feel for airflow from screen
on glareshield)
IF FORWARD AVIONICS FAN HAS FAILED
3. STBY BATT Switch - OFF (unless needed for emergency
power)
IF PFD1 COOLING OR MFD1 COOLING ANNUNCIATOR
DOES NOT GO OFF WITHIN 3 MINUTES OR IF BOTH PFD1
COOLING AND MFD1 COOLING ANNUNCIATORS COME ON
3. STBY BATT Switch - OFF (land as soon as practical)
I
3-20 U.S.
Attitude Indicator
MODEL 172S NAV III
- USE FOR ATTITUDE
172SPHAUS-03
CESSNA