PRIOR TO MAINTENANCE TEST FLIGHT (CONT)

CAUTION TM 1-1510-225-MTF PROCEDURE TROUBLESHOOTING REFERENCE (a) GND COMM PWR switch - Depress on. (b) Comm 1 transceiver - Check operation from pilot’s and copi- lot’s position. (c) GND COMM PWR switch - Depress off. Do not cycle LDG GEAR CONTR handle on the ground. 10. Gear - DN. 11. Weather radar - OFF. * 12. Fuel control panel - Check the firewall valves as follows to ensure that they are powered through the hot battery bus: (a) BATT switch - OFF. (b) LEFT and RIGHT FIREWALL VALVE circuit breakers - Pull. (c) LEFT and RIGHT FIREWALL SHUTOFF VALVE switches - CLOSED. Listen for operation. (d) BATT switch - ON. (e) LEFT and RIGHT STANDBY PUMP switches - ON. C7-11 C41 (f) LEFT and RIGHT FIREWALL SHUTOFF VALVE switches - OPEN. Check L and R FUEL PRESS annunciators extin- guished. 2-3