ABNORMAL NAVIGATION SYSTEM FAILURES
Attitude Heading Reference System (AHRS) Failures
Single AHRS Failure
1. BOTH ON AHRS 1 or AHRS 2.................. VERIFY ANNUNCIATED ON PFD
2. In-Flight Corrective Action.....................................................NONE NEEDED
Dual AHRS Failure (Red “X” – Heading and Attitude Indications)
1. AHRS Circuit Breakers ..................................................................CHECK IN
2. If Open
................................................ RESET (close) CIRCUIT BREAKERS
3. If Circuit Breakers Open Again
............................................ DO NOT RESET
4. Standby Attitude Indicator
...................................USE for attitude information
5. Magnetic Compass
............................................ USE for heading information
Air Data Computer (ADC) System Failures
Single ADC Failure
1. BOTH ON ADC 1 or ADC 2 ...................... VERIFY ANNUNCIATED ON PFD
2. In-Flight Corrective Action.....................................................NONE NEEDED
Dual ADC Failure (Red “X” – All Air Data Indications)
1. ADC Circuit Breakers.....................................................................CHECK IN
2. If Open
................................................ RESET (close) CIRCUIT BREAKERS
3. If Circuit Breakers Open Again
............................................ DO NOT RESET
4. Standby Airspeed Indicator
...............................USE for airspeed information
5. Standby Altimeter................................................ USE for altitude information
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