4-1-35. Displayed System Faults

Figure 4-1-10. Symbol Generator Test Mode

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10 4-1-23 CAUTION Keep the protective caps on the ANVIS whenever it is not in use. Operate the AN- VIS only under darkened conditions. NOTE Ensure ANVIS operator procedures have been completed. 8. P-PGM/OP/CP-PGM switch — OP. NOTE The system ON and FAIL lights will not be visible if the center console lights are turned off. 9. ADJ/ON/OFF switch — ON. SYS ON and FAIL lights illuminated and BIT will initiate automatically. 10. FAIL light — Check. Light should go out after ten seconds. BIT is complete. NOTE Allow 1 minute for display warmup. Display intensity is preset to low each time ADJ/ON/ OFF switch is set from OFF to On. If a fault is displayed in the DU, acknowledge fault and re-run BIT to confirm fault. If the fault remains notify AVUM personnel. 11. BRT/DIM switch — As desired. 12. DSPL POS control — As required. Center display in field of view. 13. Display aligned to horizon — Check. Tight- en OU clamp. 4-1-34. Operator Self Test (BIT). 1. BIT/ACK switch — Press to BIT and hold. The ON and FAIL LIGHT will illuminate. At end of BIT, FAIL indicator will extinguish (lamp will not be visible when center con- sole lights are off). 2. Display Units(s) — Verify symbol generator test mode software for CH-47 (figure 4-1-9). 3. BIT/ACK switch — Release. 4-1-35. Displayed System Faults. The system self test is divided into power-up or operator initialized built-in-test (BIT) and in-flight BIT. The faults result as warnings and messages that blink at a rate of two per second in the Display Units. Part of the BIT is a periodic test that is performed auto- matically along with normal system operation. This BIT monitors and/or tests SDC functions and/or signals. A failure of the SDC, NAV signals, pilot’s DU, or copilot’s DU will illuminate the converter control FAIL light and display a FAIl message CPM, SDR, SA, PS NAV, PDU or CPDU on the Display Unit. An ATT (gyro invalid), IAS (indicated air speed out of range), or MSL (MSL altitude out of range) sensor failure warning message will be displayed when condition exists. ATT, IAS, MSL, NAV, PDU, CPDU, and all SDC faults can be cleared by setting BIT/ACK switch to ACK. The following helicopter status messages are also dis- played. 1. The caption MST (first priority) indicates operation of the mater caution warning lamp. This message will disappear during the reset of the main warning lamp opera- tion. 2. The caption MEM (second priority) indi- cates that the doppler data is not updated. A previous computed data is available. This message will appear simultaneously with the MEM lamp on the doppler operating panel. 3. The caption HOOK (third priority) indicates the selected cargo hook has been opened in the helicopter. The message will appear after the reset of the master caution warning light when any of the cargo hooks have been opened. Setting BIT/ACK switch to ACK will not clear MST, MEM, HOOK status messages, or FIRE warning from the DU.

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