First officer reported not reengaging the autopilot on a go around; resulting in a flap overspeed.

Attributes
ACN	1711749
Time
Date	201910
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Tower
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Autothrottle/Speed Control
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

On short final into ZZZ; tower told us to go around; it was an unexpected clearance and in the process I thought I had reengaged the autopilot but had not; and did not call for go around flaps fast enough to keep the aircraft from over speeding the flaps by about 7 knots. Had I engaged the autopilot or pulled the power back from the toga (takeoff go around) setting the issue would not have occurred. After being vectored around tower informed us that they had a false indication of a vehicle or other object entering the runway area. I attempted to submit this [report] a few days after the incident when it was fresh in my mind; but I used the company app and after having several issues; I thought it submitted but only realized it didn't submit when I received notification from the [report] committee.refreshing go around procedures more often and verifying that the autopilot is engaged.

Original NASA ASRS Text

Title: First Officer reported not reengaging the autopilot on a go around; resulting in a flap overspeed.

Narrative: On short final into ZZZ; Tower told us to go around; it was an unexpected clearance and in the process I thought I had reengaged the Autopilot but had not; and did not call for Go around flaps fast enough to keep the aircraft from over speeding the flaps by about 7 knots. Had I engaged the autopilot or pulled the power back from the TOGA (Takeoff Go Around) setting the issue would not have occurred. After being vectored around Tower informed us that they had a false indication of a vehicle or other object entering the runway area. I attempted to submit this [Report] a few days after the incident when it was fresh in my mind; but I used the Company app and after having several issues; I thought it submitted but only realized it didn't submit when I received notification from the [Report] committee.Refreshing Go around procedures more often and verifying that the autopilot is engaged.

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.