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reference marks at 0, 10, 20, 30, 45, 60 and 90 degrees.
(4) Eyelid Display
Surrounds the attitude sphere and provides positive attitude
identification by a blue eyelid which always shows the relative
position of the sky and a brown eyelid which always shows the relative
position of the ground. The eyelids maintain the correct ground-sky
relationship, regardless of the position of the sphere, to facilitate
fast recovery from unusual attitudes.
(5) Pitch and Roll Command Bar
Displays computed steering commands to capture and maintain a desired
flight path. The aircraft symbol is always flown to the flight
director cue.
(6) Flight Director Warning Flag
The FD warning flag is in view when the flight director valid signal
is lost.
(7) Glideslope Pointer
The GS pointer comes into view when the VHF navigation system is tuned
to instrument landing system (ILS) frequency to display aircraft
deviation from glideslope beam centre. The aircraft is below the
glide path if the pointer is displaced upward.
(8) Glideslope Warning Flag
The GS flag is in view when the glideslope valid signal is lost.
(9) Radio Altitude Bar
The radio altitude bar provides a backup indication of radio altitude
during the critical approach phase of flight. The absolute altitude
reference above the terrain is displayed below 200 feet by a
barber-pole radio altitude bar. The bar appears at 200 feet and moves
toward the aircraft symbol as the aircraft descends toward the runway,
contacting the bottom of the aircraft symbol at touchdown.
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OPERATING MANUAL
(10) Expanded Localizer Pointer
The expanded localizer pointer displays localizer deviation whenever a
valid localizer signal is available. Localizer data from the VHF
navigation receiver is amplified approximately 7-1/2 times to permit
the localizer pointer to be used as a sensitive reference indicator of
aircraft position with respect to localizer beam centre. This is
intended for assessment only, since the pointer is sensitive and
difficult to fly throughout the entire approach. During final
approach, the pointer serves as an indicator of the category II window.
(11) Inclinometer
The inclinometer provides the pilot with a conventional display of
aircraft slip or skid, and is used as an aid to coordinate manoeuvres.
(12) Attitude Test Switch
When the attitude test (TEST ATT) switch is pressed, the attitude
sphere shows an attitude change of 20 degrees right bank, 10 degrees
pitch-up, the ATT warning flag appears, and all system annunciator
lights come on except DH (decision height).
(13) Speed Command Display
The pointer indicates relative approach airspeed provided by the angle
of attack/speed command system. The pointer deflects toward F when
aircraft is flying at more than programmed speed and toward S when
less than programmed speed.
(14) Rate-of-Turn
Rate-of-turn is displayed by the pointer at the bottom of the ADI.
The marks at the extreme left and right sides of the scale represent a
standard rate turn (3 degrees per second turn rate).
(15) Rate-of-Turn Warning Flag
The RT flag is in view when the rate-of-turn valid signal is lost.
(16) Attitude Warning Flag
The ATT flag is in view when the TEST ATT switch is pressed, the
vertical gyro valid signal is lost, primary power is lost and/or
excessive error exists between displayed attitude and attitude
received from a vertical gyro.
SECTION 4
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OPERATING MANUAL
(17) Localizer Warning Flag
The LOC flag is in view when the localizer valid signal is lost.
(18) Speed Command Warning Flag
The SPD flag is in view when the speed command valid signal is lost.
(19) Mode Annunciators
The ten mode annunciator lights indicate which vertical and horizontal
mode is engaged on the flight director, when go-around is engaged, and
when a selected decision height is reached.
(20) Radio Altitude Display
The four-digit incandescent RAD ALT display indicates the aircraft
radio altitude from -20 to 2500 feet. The resolution above 200 feet
of altitude is 10 feet and, below 200 feet, the resolution is 5 feet.
The display is blanked for altitudes greater than 2500 feet. When the
radio altitude data is invalid, the display shows a dash in each of
the four digit positions.
(21) Decision Height Set Knob and Dim Control
The inner DH SET knob is used to set an altitude between 0 and 990
feet on the decision height (DH) display. The outer DIM knob controls
the brightness of the RAD ALT and DH displays. Also, the brightness
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