S46 TRACON controller reported losing all radar data on scope display due to maintenance action. Con...

Narrative:

While working mid configuration all sectors combined a scheduled radar outage was performed. I lost all radar tracking on multiple aircraft at once. Multiple anomalous primaries were scattered throughout the scope. I couldn't verify any location speed of multiple aircraft. It was the most dangerous thing I have ever seen in my career. My hands and voice were literally shaking at what I was experiencing on position. Multiple aircraft were in the coast suspend list so I had to try to guess which one was where so I could clear for an ILS approach. [Maintenance] said they were going to be available by phone or in the TRACON I made multiple pages and calls and never received a reply. I honestly don't know if standard separation was maintained with multiple aircraft over a period of 10 to 15 minutes.never schedule a radar outage on a single person mid when there is a heavy traffic push. Have some actually in the room from af for an immediate cancellation of outage.

Original NASA ASRS Text

Title: S46 TRACON Controller reported losing all RADAR data on scope display due to maintenance action. Controller reported maintenance schedule outage without coordination.

Narrative: While working mid configuration all sectors combined a scheduled radar outage was performed. I lost all radar tracking on multiple aircraft at once. Multiple anomalous primaries were scattered throughout the scope. I couldn't verify any location speed of multiple aircraft. It was the most dangerous thing I have ever seen in my career. My hands and voice were literally shaking at what I was experiencing on position. Multiple aircraft were in the coast suspend list so I had to try to guess which one was where so I could clear for an ILS approach. [Maintenance] said they were going to be available by phone or in the TRACON I made multiple pages and calls and never received a reply. I honestly don't know if standard separation was maintained with multiple aircraft over a period of 10 to 15 minutes.Never schedule a radar outage on a single person mid when there is a heavy traffic push. Have some actually in the room from AF for an immediate cancellation of outage.

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.

Attributes
ACN	1522991
Time
Date	201803
Local Time Of Day	0601-1200
Place
Locale Reference	S46.TRACON
State Reference	WA
Environment
Light	Daylight
Aircraft 1
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

S46 TRACON controller reported losing all radar data on scope display due to maintenance action. Controller reported maintenance schedule outage without coordination.