C152 instructor and student landed at the airport after the curfew time.

Attributes
ACN	531350
Time
Date	200112
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : rst.tower
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	VFR
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 27 flight time total : 642 flight time type : 222
ASRS Report	531350
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Supplementary
Primary Problem	Ambiguous

Narrative:

ZZZ airfield has a weekend curfew for flight activities at sundown. I instructed my student to land, thinking we just had time before sunset. We landed at approximately XA45. Actual sunset occurred at XA36. ZZZ1 approach, ZZZ1 informed me prior to landing that the letter they have shows an XG00 curfew. A local NOTAM post at the flying club activity states that the curfew is at XF45 wkdays and sundown on weekends, when the tower is closed. I looked up official sundown and found I had exceeded sundown because I could still see the sunset glow. I see I must inform myself better in the future.

Original NASA ASRS Text

Title: C152 INSTRUCTOR AND STUDENT LANDED AT THE ARPT AFTER THE CURFEW TIME.

Narrative: ZZZ AIRFIELD HAS A WEEKEND CURFEW FOR FLT ACTIVITIES AT SUNDOWN. I INSTRUCTED MY STUDENT TO LAND, THINKING WE JUST HAD TIME BEFORE SUNSET. WE LANDED AT APPROX XA45. ACTUAL SUNSET OCCURRED AT XA36. ZZZ1 APCH, ZZZ1 INFORMED ME PRIOR TO LNDG THAT THE LETTER THEY HAVE SHOWS AN XG00 CURFEW. A LCL NOTAM POST AT THE FLYING CLUB ACTIVITY STATES THAT THE CURFEW IS AT XF45 WKDAYS AND SUNDOWN ON WEEKENDS, WHEN THE TWR IS CLOSED. I LOOKED UP OFFICIAL SUNDOWN AND FOUND I HAD EXCEEDED SUNDOWN BECAUSE I COULD STILL SEE THE SUNSET GLOW. I SEE I MUST INFORM MYSELF BETTER IN THE FUTURE.

Data retrieved from NASA's ASRS site as of July 2007 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.