Narrative:

Between vny and darts on the FERN5 arrival; was issued descent from 7000 to 5000 by socal appr ctrl. Descended to 5000; reported smo in sight. A few miles before darts was told to turn to heading 160; intercept rwy 21 final approach course; cleared visual approach to runway 21; santa monica. Made the turn to 160 to intercept the rwy 21 extended centerline. After I intercepted the 21 visual final app course was asked very shortly thereafter by socal if I was making the descent for the visual approach. Replied in the affirmative. Seconds later was told by socal; in a very agitated voice; to 'expedite below 4000'. I did. Switched to tower when told; and landed uneventfully.the problem here is confusion over the altitude assignment and the visual approach clearance. Once the controller cleared me for the visual approach to smo 21; the manner in which I safely descend to the glide slope and ultimately the runway is up to me. If the controller wanted me at 4000 feet as soon as possible; he should have issued the instructions 'descend to 4000; cleared visual approach...' but he did not. He left me at 5000; gave me a vector toward final; cleared me for the visual; and then got heated over the radio when I did not descend when he thought I should have. Unnecessary and unclear radio comms from the controller; and interference with my flying of the approach. Not safe.

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Original NASA ASRS Text

Title: Pilot was on a visual approach to SMO Runway 21; but SoCal Approach apparently expected him to expedite his descent and then instructed him to do so.

Narrative: Between VNY and DARTS on the FERN5 arrival; was issued descent from 7000 to 5000 by SoCal Appr ctrl. Descended to 5000; reported SMO in sight. A few miles before DARTS was told to turn to heading 160; intercept rwy 21 final approach course; cleared visual approach to RWY 21; Santa Monica. Made the turn to 160 to intercept the rwy 21 extended centerline. After I intercepted the 21 visual final app course was asked very shortly thereafter by SoCal if I was making the descent for the visual approach. Replied in the affirmative. Seconds later was told by SoCal; in a very AGITATED voice; to 'expedite below 4000'. I did. Switched to tower when told; and landed uneventfully.The problem here is confusion over the altitude assignment and the visual approach clearance. Once the controller cleared me for the visual approach to SMO 21; the manner in which I safely descend to the glide slope and ultimately the runway is up to me. If the controller wanted me at 4000 feet ASAP; he should have issued the instructions 'descend to 4000; cleared visual approach...' But he did not. He left me at 5000; gave me a vector toward final; cleared me for the visual; and then got heated over the radio when I did not descend when he thought I should have. Unnecessary and unclear radio comms from the controller; and interference with my flying of the approach. Not safe.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.