TM 9-2320-209-10-1 FRAME 5 CAUTION Under normal conditions do not stop heater by setting personnel heater EMERGENCY switch (1) in off (down) position. Damage to equipment may result. In case of an emergency condition, set personnel heater EMERGENCY cause damage sonnel will be 1. If heater fails to start or goes goes out. switch (1) in. off (down) position. This may to equipment but crew compartment per- better protected. out after a short run, wait until indicator light (2) 2. Try to restart. If heater fails to operate after third try, notify direct support maintenance unit. 4-390