Narrative:

An apparent longstanding issue with restricted airspace under the final approach fix for approaches to runway 34 at U42. I was incredulous when the controller issued the restriction to maintain at or above 8000 ft until lodme; cleared for the approach. I asked whether I could just fly the approach as depicted and he said 'no'. Thus; in mountainous terrain; in rain/snow and poor visibility; and to an airport with no approach lighting; I had to ignore an LNAV generated glideslope and to convert to a 'dive and drive' approach. I am pretty sure but not certain that I disconnected the autopilot zoomed up over the FAF as the airplane was being guided by the glideslope below 8000 feet at lodme. Had to hand fly the approach without a glideslope in challenging conditions and single pilot. I realize that nsa and other important national assets are located under the FAF but aviation safety is being sacrificed by turning a precision approach with a glide slope into a step down approach indeed with 2000 feet to lose in 4.8 miles between lodme and acipo. Change the glideslope and approach to allow a controlled/precision descent and to protect the underlying restricted area. Or if this is not possible; a clear marking on the approach plate that glide slope is 'unusable' when restricted area is active.

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Original NASA ASRS Text

Title: General Aviation Pilot on RNAV(GPS)Y Runway 34 approach to South Valley Regional Airport; Utah (U42) not allowed by Approach Controller to fly LNAV profile due to restricted airspace underlying the approach course.

Narrative: An apparent longstanding issue with restricted airspace under the final approach fix for approaches to RWY 34 at U42. I was incredulous when the controller issued the restriction to maintain at or above 8000 ft until LODME; cleared for the approach. I asked whether I could just fly the approach as depicted and he said 'no'. Thus; in mountainous terrain; in rain/snow and poor visibility; and to an airport with no approach lighting; I had to ignore an LNAV generated glideslope and to convert to a 'dive and drive' approach. I am pretty sure but not certain that I disconnected the autopilot zoomed up over the FAF as the airplane was being guided by the glideslope BELOW 8000 feet at LODME. Had to hand fly the approach without a glideslope in challenging conditions and single pilot. I realize that NSA and other important national assets are located under the FAF but aviation safety is being sacrificed by turning a precision approach with a glide slope into a step down approach indeed with 2000 feet to lose in 4.8 miles between LODME and ACIPO. Change the glideslope and approach to allow a controlled/precision descent and to protect the underlying restricted area. Or if this is not possible; a clear marking on the approach plate that glide slope is 'unusable' when restricted area is active.

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.