Narrative:

Departed ZZZ in accordance with NOTAM in effect for airshow and instructions from tower for that runway. Turned heading 150 degrees immediately after takeoff and maintained at or below 1300 feet MSL per NOTAM until clear of ZZZ class D airspace. I do not recall if my turn to heading 150 degrees occurred prior to the ATC tower as instructed by the NOTAM; but the turn was in the area where other aircraft departing turned. Continued flying south on a course west of the west short of lake X.sighted ZZZ1 airport to the southeast and announced my position on CTAF frequency shown on sectional chart. Heard response on CTAF saying to contact ZZZ1 tower. Contacted temporary tower at ZZZ1 on frequency published in NOTAM and stated that I was west of ZZZ1 and headed south. Prior to contacting ZZZ1 tower I may have entered the temporary class D airspace at ZZZ1. No traffic was seen in the area of ZZZ1 and no traffic conflicts occurred because of my presence in the vicinity of ZZZ1. After contacting ZZZ1 tower I immediately changed course to move away from ZZZ1 and exit the temporary airspace around ZZZ1.when departing ZZZ as described above; the aircraft transponder was in the standby mode as instructed by the NOTAM in effect for ZZZ. It was discovered after being a considerable distance from ZZZ; that the transponder was still in the standby mode and should have been placed in altitude mode much earlier at required by far part 91. The NOTAM only required the standby mode until leaving ZZZ class D airspace. Lessons learned:1. Read the entire NOTAM and not just the sections pertaining to ZZZ. This would have prevented the possible incursion into the airspace around ZZZ1. This would have also ensured my departure at ZZZ was per all the requirements of the NOTAM in effect.2. Frequently check the transponder; not only prior to departure; but at periodic intervals after departure. This would have prevented the extending operation of the transponder in standby mode.

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Original NASA ASRS Text

Title: PA28 pilot described mistakes made and lessons learned departing airport during an airshow.

Narrative: Departed ZZZ in accordance with NOTAM in effect for airshow and instructions from tower for that runway. Turned heading 150 degrees immediately after takeoff and maintained at or below 1300 feet MSL per NOTAM until clear of ZZZ class D airspace. I do not recall if my turn to heading 150 degrees occurred prior to the ATC tower as instructed by the NOTAM; but the turn was in the area where other aircraft departing turned. Continued flying south on a course west of the west short of Lake X.Sighted ZZZ1 airport to the southeast and announced my position on CTAF frequency shown on sectional chart. Heard response on CTAF saying to contact ZZZ1 tower. Contacted temporary tower at ZZZ1 on frequency published in NOTAM and stated that I was west of ZZZ1 and headed south. Prior to contacting ZZZ1 tower I may have entered the temporary class D airspace at ZZZ1. No traffic was seen in the area of ZZZ1 and no traffic conflicts occurred because of my presence in the vicinity of ZZZ1. After contacting ZZZ1 tower I immediately changed course to move away from ZZZ1 and exit the temporary airspace around ZZZ1.When departing ZZZ as described above; the aircraft transponder was in the standby mode as instructed by the NOTAM in effect for ZZZ. It was discovered after being a considerable distance from ZZZ; that the transponder was still in the standby mode and should have been placed in altitude mode much earlier at required by FAR part 91. The NOTAM only required the standby mode until leaving ZZZ Class D airspace. Lessons learned:1. Read the entire NOTAM and not just the sections pertaining to ZZZ. This would have prevented the possible incursion into the airspace around ZZZ1. This would have also ensured my departure at ZZZ was per all the requirements of the NOTAM in effect.2. Frequently check the transponder; not only prior to departure; but at periodic intervals after departure. This would have prevented the extending operation of the transponder in standby mode.

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.