TM 1-1520-240-104-1-20 4-1-29. Controls and Function, Pilot/Copilot HUDControl (THRUST CONT LEVER). (fig. 4-1-8)CONTROLS/INDICATORFUNCTIONBRT/DIMAllows pilot/copilot to controlbrightness of their respectivedisplays.MODE/DCLTAllows pilot/copilot to selectrespective display modes ordeclutter modes.EYE SELECTSelects the proper orientationof the symbology for left orright eye viewing.4-1-30. Modes of Operation.There are two programming modes and one operationalmode for the HUD system selected by the programmingswitch on the CCU. The adjust mode is a sub-modeunder the operational mode.a.Pilot programming — Switch set to P-PGM.b.Copilot programming — Switch set to CP-PGM.c.Operation (flight mode) — Switch set to OP. (Ad-just — ADJ/ON/OFF switch to ADJ).4-1-31. Display Modes.Symbology display modes are programmable by the pilotand copilot via the converter control unit located on theconsole. Modes are defined by selecting from a mastersymbology menu (fig. 4-1-9). Up to eight (8) displaymodes, four normal and four declutter can be pro-grammed for each user and can be selected for displayusing the display mode selection switch on the pilot orcopilot thrust control lever or on the CCU. The defaultdeclutter mode has a minimum symbology display of:Airspeed - No. 25Altitude (MSL) - No. 7Attitude (pitch and roll) - Nos. 5, 6, 20, 26Engine Torque(s) - No. 22, 23Figure 4-1-9. CH-47D HUD Master Mode Symbology Display (Sheet 1 of 3)
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