Hi,
ORACLE not available states that the Oracle database is down.Log in as user Oracle and start the database.Oracle will obivously login since he is the owner under which Oracle software is installed.
Please start the Oracle server and listener and then check from appladm user.And also include the appladm user under oinstall group.
The user appladm user should be in group : DBA as well as OINSTALL same as oracle user.
In case of any help please be free to ask me at [email protected]

Regards.
Rohit Nirkhe,Oracle DBA,OCP 8i
[email protected]