GA pilot reported near midair collision entering pattern while under ATC control requiring evasive m...

Narrative:

En-route to lns I was cleared for practice RNAV31 @ lns by approach. Contacted lns tower. Heard ATC instruct aircraft Y to change from 26 to right downwind for 31 and follow aircraft X on approach. ATC told aircraft Y that aircraft X was at it's 10 o'clock 2 miles. Then told aircraft Y traffic now at 12 o'clock at 1 mile. ATC then contacted me (aircraft X) that traffic was on right down wind for 31 at my 1 o'clock 1/2 mile. I replied 'looking for traffic'. ATC instructed aircraft Y to make a 30 degree turn to the left; I then saw something in my peripheral vision at approx. 3 to 4 o'clock. I looked and saw a plane at my altitude; about 1400 MSL; and I estimate about 200 feet away horizontally. I immediately cut power and executed a left hand dive to avoid possible collision. The aircraft had to have flown just over me and through the final approach path. I must have squeezed the comm talk button on the yoke during the evasive maneuver and the ATC recording can hear me say 'holy sh*t' when I saw the aircraft. Only after ATC asked aircraft Y if he saw the traffic did its pilot confirm traffic. I told ATC that when I get down I need to have a conversation with them and the pilot. I was cleared to land and with very shaky hands;landed safely. I was cleared by ATC to taxi to [parking] and then to call the tower when ready.

Original NASA ASRS Text

Title: GA Pilot reported NMAC entering pattern while under ATC control requiring evasive maneuver.

Narrative: En-route to LNS I was cleared for practice RNAV31 @ LNS by approach. Contacted LNS tower. Heard ATC instruct Aircraft Y to change from 26 to right downwind for 31 and follow Aircraft X on approach. ATC told Aircraft Y that Aircraft X was at it's 10 o'clock 2 miles. Then told Aircraft Y traffic now at 12 o'clock at 1 mile. ATC then contacted me (Aircraft X) that traffic was on right down wind for 31 at my 1 o'clock 1/2 mile. I replied 'Looking for traffic'. ATC instructed Aircraft Y to make a 30 degree turn to the left; I then saw something in my peripheral vision at approx. 3 to 4 o'clock. I looked and saw a plane at my altitude; about 1400 MSL; and I estimate about 200 feet away horizontally. I immediately cut power and executed a left hand dive to avoid possible collision. The aircraft had to have flown just over me and through the final approach path. I must have squeezed the comm talk button on the yoke during the evasive maneuver and the ATC recording can hear me say 'Holy Sh*t' when I saw the aircraft. Only after ATC asked Aircraft Y if he saw the traffic did its pilot confirm traffic. I told ATC that when I get down I need to have a conversation with them and the pilot. I was cleared to land and with very shaky hands;landed safely. I was cleared by ATC to taxi to [parking] and then to call the tower when ready.

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	1657969
Time
Date	201906
Local Time Of Day	1201-1800
Place
Locale Reference	LNS.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Other Practice RNAV 31
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Person 1
Function	Single Pilot
Qualification	Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 64 Flight Crew Total 853 Flight Crew Type 774
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Horizontal 200 Vertical 0

GA pilot reported near midair collision entering pattern while under ATC control requiring evasive maneuver.