Is this a wind up?
If not what the hell are you doing flying one without knowing some of these pointers allready.
1. Derated ensures longer engine and HSI life., compared to flat rated.
2.Hot or Hung Starts usually stem from 1 of 4 things
a. Battery Flat or low
b. GPU or Battery Cart flat or incorrect operation{ie. cuts out after engaging the starter}.
c. Starter Generator just about shot ie. Brushes warn beyond Limits
d. Any connection in the system thats lose or arcing.
Now you notice that most indeed nearly all PT6s have Starter limitations which are generally 25 seconds on 1 minute off, 25 seconds on 1 minute off, 25 seconds on 30-60 minutes off. This depends on your POH and type.
Also the start sequence in your POH usually has a minmum limitation of 12% N1or NG or GG. This is only a limitation and should never be attempted. My rule of thumb on this is if I dont get 16% N1 I wont introduce fuel. Anything above is OK but watch the temps carefully. If you add fuel below this and the engine is allready hot youll get a breach of a start limit TEMP, or at least a reportable temp to an engineer. Your POH will specify this.
3.If you leave it on you will draw a large mount of current through the brushes in the opposing Starter/Generator. Causing execessive wear and eventual failure. When you leats expect it.
Some Types approve what thye call Cross Generator or Generator assist starts. Which are usually for emergencies only. Also alot of smaller Types alow it B90 King Air and some Early Cheyenes I believe. BUT GENERALLY DONT DO A CROSS GEN OR ASSIST START EVER.
4. No Just ensure you identify and confirm the apropriate Propellor Lever and move it to the Feather position manually ASAP , after getting control of the Aircraft. Some Aircraft will have different speeds for Auto Feather/ nil Auto Feather operations beware of this.
5.SFAR41 dont know this will research it
6.Well the best way is to let it settle over night. Water is easily suspended in Jet A1 compared to Avgas. That is to say more "Hydroscopic" I believe the correct term is. Then drain using a standard strainer.
7. Same way Prop RPM effects MAP in a RECIP REALLY
8. Get out your POH and get someone to give you a ground school Cause I havent enough time here.
Ofcourse this depends on what Type or - dash version of the PT6 you operate and Aircraft .
Regards
'Sheep