I know there is newbie with pressure cooker. Please don't fill the water more than 2/3 of the pot. Also, let the cooker sit for 30 minutes or until the safety mechanism release it pressure. It saves energy and prevent accident. Good Luck!
To cook an old hen in a pressure cooker, you do not cover it with water. You put 1.5 to 2 cups in the bottom of the pressure cooker.
1. Rub the skin with olive oil or melted butter. sprinkle with season salt.
2. set in pressure cooker on a rack with the water in the bottom
3. bring to pressure and when under pressure, cook for 24 or so minutes.
4. Turn of pressure cooker and leave lid on for 10 minutes. Either release with valve or put under cold water(Can't use water with instantpot).
The old hen will be tender usually. If not, go back under pressure for 10 more minutes.
Remove meat from carcass and put bones back into pot with a couple of carrots, Celery, onion and or whatever veggies you like in broth. Add a bit of salt and water to half to two third of the cooker. Go back to high pressure for an hour.
You can then either use the broth in recipes or use it as a base for chicken and dumplings.
Meat can be used any way you like--enchiladas is always an option!