SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
Electronic Flight Instrument System (EFIS)
4-28
EADI CATEGORY II ANNUNCIATORS
D Category II Failure -- If Category II approach capability is lost after
Category II has been selected, a boxed CAT 2 is displayed in the
upper right corner of the attitude sphere. The box and annunciator
are amber if the radio altitude is between 200 feet and 1200 feet,
and flashing red if the radio altitude is less than 200 feet. The
flashing CAT 2 annunciator is also displayed if the radar altimeter
fails. The location of the CAT 2 annunciator is shown in Figure 4--21.
CAT 2 Failure Annunciator Location
Figure 4--21
D Excessive Deviation -- Excessive deviation monitoring is used
when Category II is active and the system is dual coupled. When
Category II deviation limits are exceeded, the deviation scale turns
amber . The threshold limits are listed in Table 4--8. Localizer and
glideslope excessive deviation monitors are disabled from 100 feet
AGL until touchdown.
Monitor Threshold
Operational Range
Localizer
35 μA(≈ 1/3 dot) Approach track to 300 ft
20 μA(≈ 1/5 dot) 300 ft to 100 ft
Glideslope
35 μA(≈ 1/3 dot) Approach track to 300 ft
35 μA(≈ 1/3 dot) 300 ft to 200 ft
65 μA(≈ 3/4 dot) 200 ft to 100 ft
CAT 2 ILS Excessive Deviation Limits
Table 4- -8
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