TM  1-1520-240-10            4-1-17 4-1-26.  CMDS Messages. Below  is  a  list  of  messages  appearing  on  the  CMDS display: DISPLAY MALFUNCTION OFP MDF# None JETTISON ON Jettison switch on PROFAIL GO BYP Loss of programmer AUTOFAIL GO MAN Not used BUMP FAIL Not used AUTO DEG Not used PROGAFIL GO BYP Loss of SDL CDU FAIL GO BYP DCDU failure CH ENAB SW FAIL Loss of chaff inhibit FL ENAB SW FAIL Loss of flare inhibit O1 ENAB SW FAIL Loss of OTHER 1 inhibit O2 ENAB SW FAIL Loss of OTHER 2 inhibit RWR ENAB SW FAIL    Loss of RWR inhibit JETT FAIL Loss of remote jettison switch MAN FAIL CH PROG Loss of DCDU PRGM switch MAN FAIL1-4 FAIL Loss of manual dispense SEQ# FAIL Sequencer failure SEQ# INV DEG Payload polling problem SEQ# BYP DEG Bypass dispense problem SEQ# JETT FAIL Loss of bypass jettison SEQ# OP FAIL Sequencer safety failure 4-1-27.  Heads Up Display (AN/AVS-7) System. The Heads Up Display (HUD) System (fig. 4-1-8) serves as an aid to pilots using the AN/AVS -6 (ANVIS) during night flight operations. The system allows the pilot and copilot to receive flight data without viewing the instru- ment panel. Instrument data is applied to the system, processed for display, and superimposed over the AN- VIS image. The set consists of the Converter Control Unit (CCU) on the console, the Signal Data Converter (SDC) on the avionics shelf, an inclinometer and air data trans- ducer both located on the avionics shelf, a HUD control switch on the pilot’s/copilot’s THRUST CONT (control) lever, and the Display Unit (DU), consisting of the Optical Unit (OU) and Power Supply Calibration Unit (PSCU). The CCU selects pilot/copilot programming which allows the pilot and copilot to select information for their respec- tive display modes from a master set of symbols. The pilot and copilot can independently program up to eight display modes, four normal and four declutter, which can be selected for display. Declutter can be used when less symboling is needed. The declutter mode has four vital symbols that will always be displayed: Airspeed, Altitude (MSL), Altitude (pitch and roll), and Engine Torque (s). An adjust mode, during operation is used to adjust baromet- ric altitude, pitch and roll. If the HUD system loses operat- ing power after adjustments have been made, the baro- metric altitude, pitch and roll must be readjusted. The system self test is divided into power-up and operator initialized built-in-test (BIT) and infight (BIT). The system built-in  test  (BIT)  is  initialized  during  power-up  or  se- lected by the operator. Part of the BIT is a periodic test that is performed automatically along with normal system operation. A failure of the SDC, pilot’s DU, or copilot’s DU will  illuminate  the  CCU  FAIL  light  and  display  a  FAIL message on the DU. When a fail message is displayed on the DU, the operator should acknowledge the failure and rerun BIT to confirm the fault. 26-volt AC to operate the  HUD  system  is  taken  from  the  No.  1  INSTXFMR through the HUD REF circuit breaker on the No. 1 PDP DC power for the system is taken from the ESSENTIAL bus through the HUD SYS circuit breaker also on the No. 1 PDP. 4-1-28.  Controls  and  Function,  Converter  Control Unit.  (fig. 4-1-8) CONTROLS/ INDICATOR FUNCTION CPLT BRT/DIM Switch Three position toggle switch spring loaded to off. When placed to BRT or DIM position momentarily, copilots display will increase or decrease brightness (when held, displays will go full bright or full dim). DSPL POS D/U/ L/R Copilot’s control for display position down/up (outer knob) and left/right (inner knob). MODE 1-4/DCLT Three position toggle switch spring loaded to off. Changes the copilot’s primary mode and/or primary mode’s declutter display. PLT BRT/DIM Switch Three position toggle switch spring loaded to off. When placed to BRT or DIM position momentarily, copilot’s display will increase or decrease brightness (when held, display will go full bright or full dim).