Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-110
26-Jul-2017
MODE 4 – UNSAFE TERRAIN CLEARANCE
This mode provides visual and aural warnings in case of insufficient terrain clearance. It has three sub-modes
4A, 4B and 4C which depend on the aircraft configuration and phase of flight.
Sub-
Mode
Phase
Config
Visual warning
Aural warning
4A
Cruise &
approach
Gear and flaps not in
landing config
Altitude between 500
and 1,000ft (depends on
airspeed)
IAS < 190 kts
GND PROX lights flash
IAS > 190 kts
GND PROX lights flash
IAS < 190 kts
TOO LOW GEAR
IAS > 190 kts
TOO LOW TERRAIN
4B
Cruise &
Approach
Gear and flaps not in
landing config
Altitude between 245
and 1,000ft (depends on
airspeed)
IAS < 159 kts
GND PROX lights flash
IAS > 159 kts
GND PROX lights flash
IAS < 159 kts
TOO LOW FLAPS
IAS > 159 kts
TOO LOW TERRAIN
4C
Take-off
Gear or flaps not in
landing config
Terrain climbing more
steeply than aircraft
GND PROX lights flash
TOO LOW TERRAIN
MODE 5 – BELOW GLIDESLOPE ALERT
Depending on the deviation from the glideslope, two different warnings may occur:
- A soft warning, when more than 1,3 dots below the glideslope, which illuminates the GND PROX lights
and sounds the GLIDESLOPE aural warning at approximately half of the volume of other aurals.
- A hard warning, when the aircraft is below 300 feet radio altitude and is more than 2 dots below the
glideslope. The GND PROX lights flash and the GLIDESLOPE aural is sounded.
The warnings will cease as soon as the deviation is less than 1.3 dots or when the PULL UP / GND PROX light is
pushed when the aircraft is below 2,000 feet altitude.
Modes 1 to 4 override mode 5 warnings.
MODE 6 – CALLOUTS (DESCENT BELOW MINIMUM, ALTITUDE CALLOUTS AND BANK ANGLE
ALERT)
This mode provides three callouts during different flight phases:
- Transition through approach minimums
A voice warning is triggered as soon as the aircraft descends below decision height, DH or minimum
descent altitude, MDA.
The function is enabled between 1,000 and 10 feet for DH and when the corrected altitude exceeds
the MDA value by 200 feet and with the landing gear extended.
- Altitude callouts
The altitude callout is a voice warning that is sounded as soon as the aircraft descends through the
preset altitude.
- Excessive bank angle alerting
In case an excessive bank angle is detected, the BANK ANGLE BANK ANGLE aural warning is sounded
once and as soon as the bank angle is increased by 20%. The threshold is computed as a function of
roll angle in respect to altitude above ground.
MODE 7 –WINDSHEAR DETECTION AND ALERTING