Ce-680 pilots reported not following SOP for testing the GPS.

Attributes
ACN	1741940
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying
Qualification	Flight Crew Commercial
Person 2
Function	Pilot Flying
Events
Anomaly	Deviation - Procedural Published Material / Policy

Narrative:

Operating VFR with own navigation in the west practice area; flying the ZZZ ILS xx. Notified approach we would be turning off GPS and changing our callsign. Approach acknowledged the change and we updated the flight identification accordingly. Upon completion of the GPS off testing we notified approach we were complete with the GPS off portion of the flight and updated the flight identification. Approach switched back to the original callsign. We identified the non-compliance during discussion with the safety officer a week later. We should have been operating under the '[letter]' callsign for the duration of the flight. Clarify the guidance / LOA / sops regarding GPS off testing.

Original NASA ASRS Text

Title: CE-680 pilots reported not following SOP for testing the GPS.

Narrative: Operating VFR with own navigation in the west practice area; flying the ZZZ ILS XX. Notified Approach we would be turning off GPS and changing our callsign. Approach acknowledged the change and we updated the flight ID accordingly. Upon completion of the GPS off testing we notified Approach we were complete with the GPS off portion of the flight and updated the flight ID. Approach switched back to the original callsign. We identified the non-compliance during discussion with the safety officer a week later. We should have been operating under the '[letter]' callsign for the duration of the flight. Clarify the guidance / LOA / SOPs regarding GPS off testing.

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.