C172 pilot reported a near midair collision with a drone while descending into sbp.

Attributes
ACN	1561883
Time
Date	201807
Local Time Of Day	0601-1200
Place
Locale Reference	SBP.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	None
Aircraft 2
Make Model Name	UAV - Unpiloted Aerial Vehicle
Operating Under FAR Part	Other 107
Flight Phase	Cruise
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 14 Flight Crew Total 242 Flight Crew Type 103
Events
Anomaly	Conflict NMAC Inflight Event / Encounter Other / Unknown
Miss Distance	Horizontal 50 Vertical 50

Narrative:

While descending towards san luis obispo; I noticed a drone pass over my left wing within 100 feet. I was descending through 2500 feet at the time; near cal poly university; roughly 4nm north of the san luis airport. I only spotted the drone for a second before it disappeared past my wing and thus did not have enough time to maneuver away from it.

Original NASA ASRS Text

Title: C172 pilot reported a NMAC with a drone while descending into SBP.

Narrative: While descending towards San Luis Obispo; I noticed a drone pass over my left wing within 100 feet. I was descending through 2500 feet at the time; near Cal Poly University; roughly 4nm north of the San Luis airport. I only spotted the drone for a second before it disappeared past my wing and thus did not have enough time to maneuver away from it.

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.