TM 1-1520-240-10
4-1-22
No.
Symbol
Source
Range/Description
19 Sensor, Fire Warnings
Light Plate Ass’y
Cockpit
ATT (failure of copilot VGI), MSL, IAS, FIRE; ATT, MSL, and
IAS can be cleared from display by selecting “ACK” (See
NOTE). FIRE cannot be cleared.
20 Horizon Line (pitch,
roll)
Vertical Gyro, Co-
pilot
Pitch: "30_
Roll: 0 - 359_
21 Display Mode Number
HUD System
1N - 4N for normal modes, 1D - 4D for declutter modes
22 Torque Limits
Torque Transduc-
er
(> 100%, solid box)
(>123%, thresholds, solid box
flashes)
23 Torque - Numerics
Torque Transduc-
er
0 - 130% (flashes when engine torque separation is greater
than 5% threshold) Max % torque split between cockpit pan-
el and HUD is 3%
24 Ground Speed
Doppler
0 - 999 knots/ 0 -530 km/h (dependent on doppler)
25 Indicated Airspeed
Air Data Trans-
ducer
0 - 220 knots (no symbol 00 knots and below, reappears at
02 knots)
26 Attitude Reference In-
dicator
HUD System
Represents helicopter
27 Engines Temperature
Thermocouple
Amplifiers
0 - 999_C (0 - 755_C, 2_units; 776_C - 999_C, 1_units) Max
split between cockpit and HUD is "15_
28 Distance to Waypoint
Doppler
0 - 999.9 km
29 Bearing to Waypoint -
Numeric
Doppler
0 - 359_
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 3 of 3)
4-1-32. Operation.
4-1-33. Starting Procedure.
1. ADJ/ON/OFF switch - OFF.
2. Optical unit support clamps — Installed on
ANVIS. Verify clamps can be rotated.
NOTE
Check surface of lense for cleanliness. Clean
in accordance with TM 11-5855-300-10.
3. DU lens — Check.
WARNING
Failure to remove the ANVIS neck cord
prior to operation of the HUD may prevent
egress from the aircraft in an emergency
and may result in serious injury or death.
4. ANVIS neck cord — Removed.
5. Optical unit - Install on ANVIS. Attach Opti-
cal Unit (OU) to either ANVIS monocular
housing. Do not tighten OU clamp com-
pletely with thumbscrew at this time. The
OU (display) may have to be rotated to hori-
zon after the system is operating.
The helmet may now have to be rebalanced.
6. EYE SELECT switch on PSCU — L or R.
WARNING
CCU ADJ/ON/OFF switch must be OFF be-
fore connecting or disconnecting quick
release connector.
CAUTION
The AN/AVS-7 system should not be used
if the quick-release connector is not in
working order.
7. PSCU — Connect. Connect PSCU to
quick-release connector by rotating the
connector engagement ring.
