PRIOR TO MAINTENANCE TEST FLIGHT (CONT)

CAUTION TM 1-1510-225-MTF PROCEDURE TROUBLESHOOTING REFERENCE PRIOR TO MAINTENANCE TEST FLIGHT (CONT) contained in TM 1-1510-225-10 - Per- formed. * 4. Oxygen system - Check as follows: (a) Passenger manual drop-out - Push off. (b) Oxygen system ready - Pull on. (c) Crew masks - 100%; check operation and stow. 5. Seats, pedals, belts, harnesses - Check and adjust. 6. PARKING BRAKE - Check. Confirm that brakes are set by applying addi- tional toe pressure. Do not force the elevator trim system past the limits which are shown on the PITCH TRIM indi- cator scale. 7. Elevator trim - Set to 0 (neutral). 8. EFIS auxiliary power - Check as fol- lows: (a) EFIS AUX POWER TEST switch - Depress for a maximum of 5 seconds. (b) Momentary illumination of the green TEST annunciator indi- cates a satisfactory test. 9. Ground communication power switch - Check as follows: 2-2