TM 1-1520-240-MTF2-3PRIOR TO MAINTENANCE TEST FLIGHT (CONT.) Before Interior Check (Cont.) e. APU START switch — RUN for 3 to 5seconds. Then START for 2 seconds. Thenrelease to RUN. Operation of the APU iscontrolled by the electronic sensing unit.NOTEIf the APU ON caution light does not come on, orif the start is automatically shutdown, set the APUswitch to OFF and check the bite indicators on theelectronic sensing unit for the cause of theshutdown.f. APU ON 712 caution light 714A advisorylight — Check on.g. UTIL HYD SYS caution light — Check out(30 seconds maximum).h. APU GEN switch — ON. Check NO. 1 andNO. 2 RECT OFF caution lights out.i. POWER XFR NO. 1 and POWER XFR NO.2 switches — ON. Check NO. 1 and NO. 2HYD FLT CONTR caution lights out.WARNINGIf either FLT CONTR caution lights do not goout in 30 seconds after POWER XFR switchesare set to ON, set the POWER XFR switches toOFF. Do not fly the helicopter.
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