TM 1-1520-240-10
Change 20 4-1-21
No.
Symbol
Source
Range/Description
1 Angle of Pitch Scale
HUD System
"30_ (10_ units, tic marks flash when angle of pitch is
u"30_)
2 Bearing to Waypoint -
Pointer
Doppler
0 - 359_ (cursor will invert “V” when aircraft is moving away
from the waypoint)
3 Compass Reference
Scale
HUD System
0 - 359_ (10_ units)
4 Aircraft Heading Fix
Index
HUD System
Fixed Reference Mark
5 Angle of Roll - Pointer
Vertical Gyro, Co-
pilot
"30_ (right turn moves pointer to right, pointer flashes
u"30_)
6 Angle of Roll - Scale
HUD System
"30_ (10_ units)
7 Barometric Altitude
(MSl)
Air Data Trans-
ducer
-1500 to 20,000 feet (set during adjustment mode)
8 Adjust/Program Mode
Message
HUD System
ADJ or PROG
9 OK/FAIL
HUD System
OK or FAIL
10 Velocity Vector
Doppler
0 - 15 knots/15 kilometers, 0-359_
11 Rate of Climb Pointer
Air Data Trans-
ducer
"2000 feet-per-minute (used with vertical speed scale, No.
15)
12 Radar Altitude (AGL) -
Numeric
Radar Altimeter,
Pilot
0 - 1000 feet (0 - 200 feet, 1 foot units; 200 -1000 feet, 10
feet units; disappears above 999 feet, and reappears below
950 feet)
13 Minimum Altitude
Warning
Radar Altimeter,
Pilot
Blinking square around symbol - No. 12, set on pilot’s radar
altimeter (use low set index)
14 Radar Altitude (AGL)
Analog Bar
Radar Altimeter,
Pilot
0 - 200 feet (disappears at 250 feet, reappears at 225 feet;
digital readout symbol, No. 12)
15 AGL Vertical Speed -
Scale
HUD System
0 -200 feet/"2000 feet-per-minute
16 HUD Fail Message
HUD System
CPM, SDR, SDA, PS, PDU, CPDU, NAV, PGM; can be
cleared from the display by selecting “ACK” (See NOTE)
17 Trim (Slide Ball)
Inclinometer
"2 balls (left/right)
18 MST, MEM, HOOK
Messages
Master Caution
Panel
MST, MEM, HOOK; cannot be cleared from the display by
selecting “ACK”
NOTE: After ACK is used to acknowledge a fault, the fault will not reappear until BIT is selected or power is cycled
off and on.
Figure 4-1-9. CH-47D HUD Master Mode Symbology Display (Sheet 2 of 3)
