munirabbasi Posted October 15, 2016 Share Posted October 15, 2016 If complete loos of electrical power during engine starting cycle i,e > 16%, what effect on engine. Regards Munir Abbasi Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted October 20, 2016 Share Posted October 20, 2016 Engine will continue starting cycle as long as starter valve is open, however TD system protection will not be available, fuel pumps will drop back to series operation. Once starter valve closes, rpm will decay and TIT rise until engine flames out Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 23, 2016 Share Posted October 23, 2016 Depends... On your model aircraft, starting air source as well as definition of "ALL" electrical power loss meaning AC and DC and at what point RPM the power loss occurred. If you have Engine Bleed Air Regulator valves they will close (Spring loaded closed when de-energized) and your starter control valve is also spring loaded closed when de-energized. If you have an APU the solenoid fuel valve will be de-energize closed resulting in loss of air so if the power loss occurred prior to 50% or so the engine would stall and overtemp without engine instrument indications. In "older" aircraft NATOPS has a CAUTION about loss of the GTC during start (first engine) requiring the condition lever be placed in feather in case of loss of power "opening of the Battery Relay" as no power would be available to close the fuel control shutoff valve. Quote Link to comment Share on other sites More sharing options...
GVS Posted October 23, 2016 Share Posted October 23, 2016 15 hours ago, NATOPS1 said: Depends... On your model aircraft, starting air source as well as definition of "ALL" electrical power loss meaning AC and DC and at what point RPM the power loss occurred. If you have Engine Bleed Air Regulator valves they will close (Spring loaded closed when de-energized) and your starter control valve is also spring loaded closed when de-energized. If you have an APU the solenoid fuel valve will be de-energize closed resulting in loss of air so if the power loss occurred prior to 50% or so the engine would stall and overtemp without engine instrument indications. In "older" aircraft NATOPS has a CAUTION about loss of the GTC during start (first engine) requiring the condition lever be placed i n feather in case of loss of power "opening of the Battery Relay" as no power would be available to close the fuel control shutoff valve. I remember using "hot day start" on A models when starting engines without external power applied and losing the ATM.All GTC bleed air went toward spinning #3 up to starter cut out speed.A little scary the first time it happened to you and more so if it happened at night.A flashlight handy was a must! If the engine start check list was adhered to and #3 generators were selected on, as soon #3 was on speed,the lights came on and you could start breathing again. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 23, 2016 Share Posted October 23, 2016 We had GTC and ATM on the earlier aircraft and yes we too "Took the ATM and Gen OFF line" during start to give the air to the starter. You would loose the AC power but the DC power remained so there was no issue with the start and the secondary AC provided engine Insts. Quote Link to comment Share on other sites More sharing options...
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