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CHRONOGRAPH (CHR)
The chronograph (CHR) begins counting upon depression of the CHR switch. The first switch actuation starts the CHR from zero (00:00). Pressing the switch again stops the CHR timer. Pressing the switch a third time deletes the display and resets the CHR timer.
GPS/MAN MODE
GPS
The chronometer uses external GPS time when the user has selected GPS mode. GPS mode is indicated by an illuminated “GPS” indication on the LCD display.
MAN
The chronometer uses a highly accurate internal time base when the user has selected manual mode. Manual mode is indi-cated by the absence of the “GPS” indication on the LCD display.
MODE
The mode push button provides two functions. Pressing the mode button will toggle between the UTC (zulu time), LOC (local time) and date displays. By pressing and holding the mode button for more than two seconds, the chronometer will enter the UTC, LOC and date mode.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
11-01-30 STANDBY COMPASS
DESCRIPTION
The standby compass supplies the flight crew with the magnetic heading data. This system is in constant operation and is used as an auxiliary display.
COMPONENT AND OPERATION
The standby compass is installed in a bracket on the center post of the windshield, above the flight guidance panel. The compass is aligned with the aircraft longitudinal axis.
The standby compass is a self-contained unit that has a transparent and molded bowl and is filled with silicon fluid. In the fluid is a sphere with a compass dial. Silicone fluid is used to insure free and smooth movement in order to provide an ac-curate indication. Metal bellows in the compass let the fluid volume expand and contract to changes in temperature and altitude.
The standby compass is lighted and uses a special non-magnetic bulb. The light unit is powered by 5 vdc from the integral light controller.
The compass dial shows markings for the four cardinal heading (N, E, S, W) and has numerals every 30°, with bars every 10°. The last numeral is not shown (for example “24” means “240”). Heading of the aircraft is read against the vertical lubber line.
To operate correctly, the compass needs installation adjustments and also corrections for heading indication errors caused by magnetic interference from the aircraft electrical and avionics system. During the adjustment procedure, the heading reference is supplied by the attitude and heading references system (AHRS).
The standby compass is adjusted in the vertical axis with two adjustment screws that attach the compass to the mounting bracket through two extended holes. At the top of the compass there is an index error adjustment scale. The center major index mark on this scale is used as a reference point during the adjustment procedures.
The standby compass has also two compensators (B and C) installed at the top area of the compass. They are used to adjust the readings for the magnetic interferences.
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