Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 57
0 2 4 6 8 10
MODE 2B TERRAIN CLOSURE RATE
CLOSURE RATE (1000 FPM)
M
IN
T
E
R
R
A
IN
C
L
E
A
R
A
N
C
E
(F
T
)
(T
hou
sands)
STATIC ALERT ENVELOPE
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ALERT AREA
3000
F
P
M
789 FT
2253
F
P
M
2038
F
P
M
FLAPS UP LOWER CUTOFF (30 FT)
FLAPS DOWN LOWER CUTOFF (200 FT,
VARIES WITH ALTITUDE RATE)
FIGURE 6.2.2.3-1: MODE 2B STATIC ENVELOPE
The lower part of the Mode 2B envelope is controlled as a function of radio altitude and altitude rate when flaps are in the full
landing configuration, as shown in Figure 6.2.2.3-1.
0 -0.4 -0.8 -1.2 -1.6 -2 -2.4 -2.8
(Thousands)
ALTITUDE RATE (FPM DESCENT)
TE
R
R
A
IN
C
LE
A
R
A
N
C
E
(F
T
)
(Thousands)
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
200 FT
-400 FPM
-1000 FPM
600 FT
MODE 2B FLAPS DOWN
CUTOFF (INHIBIT) AREA
FIGURE 6.2.2.3-2: MODE 2B LOWER CUTOFF
The sloped portion of the Mode 2B Lower Cutoff in Figure 6.2.2.3-2 is represented by the equation:
TERRAIN CLEARANCE (FT)] = -66.777 - 0.667[ALTITUDE RATE (FPM)]