Mandatory altitude

Mandatory altitude. An altitude depicted on an instrument approach chart with the altitude value both underscored and overscored. Aircraft are required to maintain altitude at the depicted value.

Mandatory altitude
Mandatory block altitude
Mandatory Continuing Airworthiness Information (MCAI) ...

MANDATORY ALTITUDE- An altitude depicted on an instrument Approach Procedure Chart requiring the aircraft to maintain altitude at the depicted value.
MAP-
(See MISSED APPROACH POINT.) ...

The line below the intercept altitude of the ILS is a minimum not mandatory altitude
Interception of the glide slope from the PT is always from below
When radar is used or the feeder fix course is within 30-degrees of the final course NoPT exists ...