Figure 2-9-2. Maintenance Panel

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10 2-9-2 LEFT RIGHT Figure 2-9-2. Maintenance Panel b. DEBRIS SCREEN Magnetic Indicators. There is one indicator each for the FWD transmission, AFT trans- mission, and the Left (No. 1) and Right (No. 2) engine transmissions. There are two indicators for the COMB transmission. one indicator for the left sump and one indi- cator for the right sump. NOTE Their is no cockpit indication of a latched DE- BRIS SCREEN magnetic indicator. If a DE- BRIS SCREEN magnetic indicator latches, the flight engineer shall advise the pilot imme- diately. The indicators are electrically connected to screens in the sumps of each transmission. If the screen mesh is bridged with conductive particles, the indicating circuit closes and trips the corresponding DEBRIS SCREEN magnetic indicator on the MAINTENANCE PANEL. c. MAIN OIL PRESS indicating Lights. If main oil pressure drops below 20 psi in any transmission or 10 psi in the aft shaft bearing, the corresponding indicating light will illuminate. in addition, the XMSN OIL PRESS caution will illuminate on the master caution panel. d. AUX OIL PRESS indicating Lights. If auxiliary oil pressure drops below 20 psi in the FWD or AFT trans- mission or 10 psi in the COMB transmission, the corre- sponding indicating light will illuminate. In addition, the XMSN AUX OIL PRESS caution will illuminate on the master caution panel. e. OVERTEMP Magnetic Indicators. Each OVER TEMP magnetic indicator is electrically connected to a temperature probe in the reservoir of each transmission. If oil temperature in the transmission reservoir exceeds 140_C, a switch closes. When the switch closes, the XMSN OIL HOT caution illuminates on the master cau- tion panel and trips the corresponding OVERTEMP mag- netic indicator on the MAINTENANCE PANEL, thus iden- tifying the hot transmission. 2-9-5. HYDRAULICS Section. This section monitors the FLT CONT NO 1, FLT CONT NO 2, and UTILITY hydraulic systems. It consists of three PRESSURE indicators, three fluid TEMPERATURE indi- cators, two RESERVOIR LEVEL indicators, six FILTER CHANGE indicating PRESS-TO-TEST lights, and four PUMP FAULT indicating PRESS-TO-TEST lights. Power to operate the indicators is supplied by the No. 2 DC bus

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