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About pict

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  • Birthday 02/29/1984

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  1. pict

    Engine start on batteries

    In real life (at Seabourne and Eagle at least) they use the time charging/cooling the batteries to sort out any last minute paperwork, weight and balance issues, flight plan and other miscellaneous issues that pop up). So the wait actually doesn't seem too long, of course it'll feel long when you're watching a computer monitor. :-)
  2. pict

    Engine start on batteries

    If I remember right, the CT7's bleed air in Auto position will shut them off automatically during start to keep maximum airflow into the combustors' drums during the initial lightoff (keeps down the temperature spike), then enable them after the engineis self-sustaining, hence the resetting them then placing them in the auto position. Regarding the second question, turning off the avionics before start reduces the power spike that occurs on the ESS electrical busbar during the first few seconds of engine start. At any rate, the avionics are "kicked off" the ESS busbar during start up until the engine(s) is/are self-sustaining, then brought back online. The Saab and other CT7 powered props (like the CN235) are a bit unusal in that you out the condition lever in start/feather BEFORE you hit the start switch (the lever position in start/feather arms the igniters if I recall correctly) - with them in the off position, you'll just be "dry motoring" the engine. Hope this helped. -Xavier (edited for better viewing on desktops - looked good on tapatalk )
  3. pict

    Engine start on batteries

    The relay should be automatic. Ensure parking brakes on (v key) Turn on both batteries (to the on position), then turn on the battery temperature display, ensure its showing <56C for BOTH batteries (maybe the max is higher, cant remember off the top of my head). Set the volts/amps switch to right gen. Move the condition lever for #2 to start and feather, then move the start switch to #2, hold it for 2 seconds. -at this point the engine should catch and stabilise with the prop feathered after a few seconds. Turn on #2 generator by first moving thr switch to the RESET position, after ~3 seconds you should see the volts/amps meter showing a load. -allow the battery to charge for a few minutes (indicated by the amps load gradually dropping). When the battery temp drops below ~39-42C: -turn on avionics/inverters **(you can choose to wait until after #1 engine has started) Repeat start procedure above for engine one. After both engines have stabilised with gens on + avionics on, bring both props out of feather together, pausing at each point until the engines have stabilised before moving to another, until you get to the 'max' detent. --Xavier
  4. pict

    Props windmilling

    Actually on the real airplane the propeller brake is optional and only found on the #2 engine if installed - the prop for engine #1 is often tied with a strap to the rail of the airstair to prevent windmilling. The #2 engine is left free and will windmill in windy conditions. -Xavier