Small airplane pilot reported a near midair collision in the pattern at LOM airport.

Attributes
ACN	1479086
Time
Date	201709
Local Time Of Day	1201-1800
Place
Locale Reference	LOM.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	Initial Climb
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 12 Flight Crew Total 1119 Flight Crew Type 69
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 100 Vertical 100

Narrative:

Near miss at wings (LOM) corner of crosswind and downwind at 1500FT. I announced on 123.0; to wings traffic; 6 miles out; inbound left downwind 24. I also announced on 123.0; to wings traffic; 4 miles out; inbound left downwind 24. We were entering the downwind corner; and heard an announcement from someone crosswind. We looked to the left and could not find the traffic nor was it being displayed as traffic. We then noticed traffic to our right close above us past downwind turning right.I announced on 123.0 that I had the crosswind traffic; we continued on downwind maintaining the altitude. We could not see him and since he was not showing on our traffic display; we didn't know his position. I felt the safest move was to continue away from him. I continued to announce downwind; base; final and landed.he came into the terminal asking for me; I suggested we talk about it; he did not want to talk and departed. [A person] at wings said she heard all my position calls clearly. I discussed pattern safety with my cfii. I also called AOPA (aircraft owners and pilots association) to talk pattern safety. It was perplexing that he did not show up on my traffic display; yet wings is inside the mode C veil.

Original NASA ASRS Text

Title: Small airplane pilot reported a NMAC in the pattern at LOM airport.

Narrative: Near miss at Wings (LOM) corner of crosswind and downwind at 1500FT. I announced on 123.0; to Wings traffic; 6 miles out; inbound left downwind 24. I also announced on 123.0; to Wings traffic; 4 miles out; inbound left downwind 24. We were entering the downwind corner; and heard an announcement from someone crosswind. We looked to the left and could not find the traffic nor was it being displayed as traffic. We then noticed traffic to our right close above us past downwind turning right.I announced on 123.0 that I had the crosswind traffic; we continued on downwind maintaining the altitude. We could not see him and since he was not showing on our traffic display; we didn't know his position. I felt the safest move was to continue away from him. I continued to announce downwind; base; final and landed.He came into the terminal asking for me; I suggested we talk about it; he did not want to talk and departed. [A person] at Wings said she heard all my position calls clearly. I discussed Pattern Safety with my CFII. I also called AOPA (Aircraft Owners and Pilots Association) to talk Pattern Safety. It was perplexing that he did not show up on my traffic display; yet Wings is inside the Mode C veil.

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.