ARMY TM 9-6115-670-14&P 2-13 Proceed as follows: a.  Check that the ground strap is fastened securely to the frame assembly.  If it is not, notify the next higher level of maintenance. b.  Refer to the system technical manual and ensure APU power source is turned on. c.  On APU control unit front panel, place MASTER ON-OFF switch to ON position.  OIL PRESSURE indicator will go out when APU engine starts.  LOW FUEL indicator will illuminate and go out once APU fuel reservoir becomes full. d.  Place ENGINE START-PREHEAT switch in PREHEAT position and hold for 30 seconds. e.  Place ENGINE START-PREHEAT switch in START position.  When APU engine starts, release switch.  All fault indicators on APU control unit front panel should be out. f.   Check that DC AMP ammeter on APU control unit front panel is reading positive current flow. g.  When WATER TEMPERATURE gauge on APU control panel reaches 140°F (60°C), place AC POWER ON-OFF switch in ON position. h.  Observe all APU control unit front panel instruments for normal readings. 2.6.    SHUT-DOWN. 2.6.1. Normal Shut Down.  Proceed as follows: a.  Place the AC POWER ON-OFF switch in the OFF position. b.  Allow the APU to operate approximately three minutes with no load applied. c.  Place the MASTER ON-OFF switch in the OFF position. 2.6.2. Emergency Shut Down.  Press in the EMERGENCY SHUTDOWN switch. The APU will shut down immediately. CAUTION If any of the indicator lights illuminate, stop the APU and correct the indicated fault before proceeding with operations. CAUTION Do not crank engine in excess of 15 seconds.  Allow starter assembly to cool at least 15 seconds between cranking. NOTES Before restarting the APU, ensure that the EMERGENCY SHUTDOWN switch is pulled out. The BATTLE SHORT switch should be activated ONLY in emergency situations.  Activating the switch will override all  APU  safety  features  except  the  overload  condition safety feature.