L-3 TECHNOLOGIES ESI-500 - Figure 3-23: ITI Alert Condition; Imminent Terrain Impact (ITI); Table 3-2: Required Terrain Clearances for the ITI Alert Condition

ESI-500
Pilot’s Guide3-26
Display Features
Imminent Terrain Impact (ITI)
The ITI alert condition occurs when your aircraft is currently below the
altitude of the upcoming terrain along the projected ight path, and the
projected terrain clearance is less than the required terrain clearance
(Figure 3-23 and Table 3-2). The ESI-500 issues a caution alert 60
seconds before the offending terrain and a warning alert 30 seconds
before the offending terrain. See Table 3-2 for other phase options for
phase of ight clearance limits.
Figure 3-23: ITI Alert Condition
Table 3-2: Required Terrain Clearances for the
ITI Alert Condition
WARNING
The ESI-500 does not know where the pilot intends to land,
therefore it calculates alerts based on the aircraft proximity
to the closest airport and measures the distance from that
airport once per second. The closest airport may or may
not be the airport where the pilot intends to land. Failure to
understand this logic may cause you to misinterpret alerts
or the lack of alerts.