3.4 ELECTRONIC MONITORING AND CONTROL SYSTEM ECS OPERATION Fault No. 1148: (1151) $h: Pump back-up pressure X4-1 failure Help: Back-up pressure for pumps on engine 1 insufficient - Check valve Y102-1. Fault No. 1154: (1157) $h: Pump back-up pressure X4-2 failure Help: Back-up pressure for pumps on engine 2 insufficient. - Check valve Y102-2. Fault No. 1160: (1163) $h: Faulty pressure switch for pump back-up pressure X4 Help: One of the pressure switches B97 for X4 back-up pressure is open with switched off engine. - Check pressure switches B97-1 & B97-2. Fault No. 1166: (1169) $h: Air cleaner of engine 1 restricted Help: - Clean or replace filter elements. Fault No. 1172: (1175) $h:
Air cleaner of engine 2 restricted Help: - Clean or replace filter elements Fault No. 1178: (1181) $h: Faulty pressure switch for air cleaner of engine 1 Help: The pressure switch is closed with the engine switched off. - Check pressure switches B18-1 & B19-1 Fault No. 1184: (1187) $h: Faulty pressure switch for air cleaner of engine 2 Help: The pressure switch is closed with switched off engine. - Check pressure switches B18-2 & B19-2 Fault No. 1190: (1193) $h: Faulty monitor channel for X1-1-pressure Help: Pressure pick up B85-1 for the X1-1-pressure shows inad- missible values. - Check sensor and cables. 174