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A yellow SSEC flag may be displayed if the ISI is not able to compute A/C airspeed and altitude, by taking into account SSEC law correction tables.
Localizer and glideslope data comes from VHF NAV 1. The localizer and glideslope pointers and scales do not come into view until a valid ILS frequency is received. If the localizer or glideslope data becomes invalid, the appropriate red (LOC or GS) flag comes into view, and the corresponding pointer and scale are removed.
ISI Alignment
When the ISI is first energized, a self.test is initiated (10 to 20 sec) for airspeed and altitude, then an alignment is in progress (attitude) with an ALIGNING flag in view. After approximately 70 seconds, the flag is removed from view and ISI becomes operational.
ISI Alignment (Attitude) Figure 11.10.49
ISI Functions
The brightness control buttons (+) and (.) provide adjustment independent of the instrument panel lighting.
The cage button resets the attitude to zero when depressed for more than two seconds.
FLIGHT INSTRUMENTS Description Vol. 2 11.10.56
Oct 05/06
The standard (STD) pushbutton switches the altimeter display from standard pressure to barometric (BARO) pressure. The rotary BARO knob allows for barometric altimeter adjustment.
The ILS is a multiple-press pushbutton to select or deselect ILS front-course and localizer back-course (BCRS).
Annunciation for both ILS and BCRS is presented on the top left corner of the display as a green ILS or a green B/C.
ISI Functions
Figure 11.10.50
Standby Magnetic Compass
The standby compass is independent, and does not interface with other systems. It is a self-contained, dry compass which uses eddy current damping to prevent overshooting. A miniature aircraft pointer indicates aircraft heading, in relation to magnetic north, on a rotating vertical compass card.
A compass correction card, mounted above the instrument, is used to record the values that must be added to or subtracted from the compass indications, in order to correct for the influence of magnetic materials contained in the aircraft, and magnetic fields from the avionics systems near the compass.
FLIGHT INSTRUMENTS Description Vol. 2 11.10.57
Oct 05/06
Standby Magnetic Compass
Figure 11.10.51
CLOCK/CHRONOMETER (GPS-SYNCHRONIZED)
Description
A Smiths GPS clock/chronometer, model no. SR261902, is installed on the center of the instrument panel just below the ISI.
The clock is comprised of an LCD display, divided into three segments:
.
The upper segment provides the flight time, in hours and minutes, from 00:00 to 99:59.
.
The middle segment provides either Coordinated Universal Time (UTC) (in hours, minutes, and seconds, from 00:00:00 to 23:59:59), local time (LOC) (in hours, minutes, and seconds, from 00:00:00 to 23:59:59) or date (in day, month and year).
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