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Overspeed Warning
When the CADC detects that the airplane has reached maximum operating airspeeds, a signal is sent to the central aural warning system. The central aural warning system will then generate a “clacking” sound, alternating with the spoken word “OVERSPEED” or “SLAT OVERSPEED” (as applicable), until the airspeed is within prescribed limits. A test switch is provided for simulating the overspeed warning condition.
Continental
Rev. 12/01/00 #29 Flight Manual
TAS / SAT Indicator (Installed On Some Aircraft)
The TAS / SAT indicator provides a digital readout of the true airspeed, static air temperature and total air temperature. True airspeed and SAT are normally supplied to the indicator by CADC 2 or if selected CADC 1.  Total air temperature may be read in the SAT readout by pushing the TAT button.
Standby Magnetic Compass
The standby magnetic compass provides a heading reference in relation to magnetic north. The compass is enclosed in a housing in the right rear overhead corner of the cockpit. The Captain’s and F/O’s viewing mirrors are mounted on hinged brackets to permit them to be folded down against the glareshield when desired. The compass is lighted by internal and external lights. Both lights are controlled by a switch located on the overhead panel. Compass lighting is not available on Emergency Power.
Clock
Two 8-day, stem-wound, elapsed time clocks are installed, one for the Captain and one for the First Officer.
Directional Indicating Systems
There are two independent directional indicating systems, compass system 1 and compass system 2. Each compass system is stabilized by an associated directional gyro and receives magnetic heading inputs from an associated flux valve. Compass heading is displayed on the RMIs and HSIs at all times.
Compass system 1 provides magnetic heading to the F/O’s RMI, Captain’s HSI, VOR/LOC 1 and digital flight guidance computers (DFGC’s) 1 and 2. Compass system 2 provides magnetic heading to the Captain’s RMI, F/O’s HSI, VOR/LOC 2, and DFGC’s 1 and 2.
On some aircraft, A compass selector is provided to select NORM (normal) BOTH ON 1 (compass system 1), or BOTH ON 2 (compass system 2). When NORM is selected, function is as described above. When BOTH ON 1 or BOTH ON 2 is selected, the selected compass provides magnetic heading to all instruments. An amber COMP (compass) light is provided on the Captain’s and F/O’s instrument panels to indicate that the compass selector is out of NORM and switching has occurred.
MD83 Attitude and Heading Reference System (AHRS)
General
There are two independent Attitude and Heading Reference Systems (AHRS) installed in the MD83 aircraft. They replace all conventional vertical and directional gyros. The AHRS uses a platform similar to that used by an inertial navigation system. It consists of two gyros (each giving two independent outputs) and three accelerometers. All of these are rigidly mounted in the black box, which is carefully aligned to the aircraft’s vertical, longitudinal, and lateral axes. The platform requires input from the flux valve for heading reference and a TAS input from the CADC.
Modes of Operation
There are two modes of operations, normal and basic.  The normal mode is the expected mode of operation. It provides highly accurate and stable heading signals in addition to attitude reference with no turning or acceleration errors. If the system reverts from the normal mode, it will operate in the basic mode.  In this mode, the AHRS functions the same as a standard attitude and heading system. Operation in the basic mode is indicated by the appropriate blue annunciator light.  Basic mode is certified for all flight regimes and modes including autoland. Once in the basic mode, the AHRS will remain in this mode until the next power up.  The system will revert to basic mode if power is lost for more than 1/2 second.
In addition, if any of the following occur inflight, AHRS will revert to the basic mode:
.
CADC failure

.
A true airspeed of less than 102 knots

.
Loss of the TAS output from the CADC

.
Any AHRS internal failures.

AHRS 1 (or 2) Basic Mode Light
The blue lights are located on the annunciator panel.  It will illuminate when the associated AHRS has automatically downgraded to the Basic mode.
Continental
Rev. 12/01/00 #29  Flight Manual
AHRS Output Signal
The number 1 AHRS provides attitude signals to the Captain’s ADI, and HSI and the F/O’s RMI.  The number 2 AHRS provides attitude signals to the F/O’s ADI and heading signals to the F/O’s HSI and the Captain’s RMI.  If either system fails, the applicable attitude and heading flaps will come into view and inform you of the failure.
　
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