Embraer EMB145, Operation Manual

Page: 1641 / 2662

CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
20
Code
01 REVISION 38
A
O
M-145/1
114
MODE 5 - EXCESSIVE DEVIATION BELOW GLIDESLOPE BEAM
Mode 5 provides two levels of alerting if the airplane's flight path
descends below the glideslope on ILS approaches.
Minimum Terrain Clearance (MTC) for " GLIDESLOPE " message
triggering:
−
Minimum:
−
For the Soft Alert Area, 30 ft at 2.98 dots of glideslope
deviation.
−
For the Hard Alert Area, 30 ft at 3.68 dots of glideslope
deviation.
−
Maximum:
−
For the Soft Alert Area 1000 ft.
−
For the Hard Alert Area 300 ft.
The first alert occurs whenever the airplane is more than 1.3 dots
below the beam and is called a "soft alert" because the volume level is
reduced. A second alert occurs below 300 ft radio altitude with greater
than 2 dots deviation from glideslope and is louder or "hard".
The aural message " GLIDESLOPE " is sounded once. Follow-on alerts
are only allowed when the airplane descends lower on the glideslope
beam by approximately 20%. Aural messages are sounded
continuously once the airplane exceeds 2 dots.
The " GPWS" warning message is displayed on EICAS for airplanes
equipped with GPWS and the amber " GND PROX" indication on the
PFD for airplanes equipped with EGPWS.
The glideslope warning can be canceled by pressing the Master
Caution Button.