SEP (HMG)- Standby Electrical Power скачать в хорошем качестве

SEP (HMG)- Standby Electrical Power

The SEP (Standby Electrical Power) goes by several names, but it's all the same thing. ABEX is American Brake Exchange (the company that builds the thing). HMG stands for Hydraulic Motor Generator because it uses a combined hydraulic system to turn the motor. Suppose you were at 45,000' over the middle of the Atlantic ocean in the middle of the night and had a Dual Converter failure. You had absolutely no power except for the batteries. Unfortunately, those batteries will drain out in about 20 minutes. When the airplane loses power and switches to battery power only, you will need to shed power to conserve the battery and the battery will only run essential items and equipment. You do have the APU but you would need to descend to 15,000 to get a guaranteed APU start (assuming you have enough battery power left), but if you descend, start the APU, and climb back up to altitude, you would use up too much fuel and won't have enough fuel to cross the ocean. So, what do you do? Well, you have the SEP. Standby Electrical Power system. It uses the COMBINED (left) Hydraulic system to turn the SEP motor that will produce the electric needed. When you turn on the SEP (or HMG) you will not gain anything more than what the batteries will provide, but you will not be draining the batteries any more. Conserving the batteries will allow about TWO (2) APU start attempts. This video shows a scenario in which we lose both converters, rely on battery power, and then start up the SEP (HMG) in the proper order.