"Jose" wrote in message
...

IF the controller fails to assign an altitude to maintain when giving the
approach clearance umpty ump miles out, I presume the existing altitude
assignment remains valid until the aircraft is established, in this case
until SENNA, the start of the heavy black line. Yes?


§ 91.175 Takeoff and landing under IFR.

(i) Operations on unpublished routes and use of radar in instrument approach
procedures. When radar is approved at certain locations for ATC purposes, it
may be used not only for surveillance and precision radar approaches, as
applicable, but also may be used in conjunction with instrument approach
procedures predicated on other types of radio navigational aids. Radar
vectors may be authorized to provide course guidance through the segments of
an approach to the final course or fix. When operating on an unpublished
route or while being radar vectored, the pilot, when an approach clearance
is received, shall, in addition to complying with §91.177, maintain the last
altitude assigned to that pilot until the aircraft is established on a
segment of a published route or instrument approach procedure unless a
different altitude is assigned by ATC. After the aircraft is so established,
published altitudes apply to descent within each succeeding route or
approach segment unless a different altitude is assigned by ATC. Upon
reaching the final approach course or fix, the pilot may either complete the
instrument approach in accordance with a procedure approved for the facility
or continue a surveillance or precision radar approach to a landing.