Cdw controller reported issuing a traffic alert to a departing aircraft for traffic departing an adj...

Narrative:

Aircraft X was on a routine practice flight out to the north from essex county airport (cdw). At the time the aircraft was still climbing out and had just received a radar target on aircraft X. As they were approaching lincoln park airport (N07) another target came up at their 12 o'clock same altitude. It appeared the targets were in very unsafe proximity to each other. Traffic alert was given to aircraft X but not to the other aircraft that had flown into controlled airspace without 2 way radio communication. Radar coverage at cdw and N07 does not reach the ground; so a target is sometimes not picked up until they are climbing out of 1;500 feet.N07 is uncontrolled with less than a mile of uncontrolled airspace between N07 and cdw class D boundary. And without total radar coverage; the controllers at cdw are unable to safely give pilots traffic calls around N07 until aircraft become conflicts. I recommend that N07 departures and arrivals call cdw tower before switching to unicom inbound and as soon as practical after takeoff. If pilots are made to make the proper communication and coordination; safety and efficiency will be improved exponentially.

Original NASA ASRS Text

Title: CDW Controller reported issuing a traffic alert to a departing aircraft for traffic departing an adjacent uncontrolled airport where there is no radar coverage below 1;500 feet.

Narrative: Aircraft X was on a routine practice flight out to the north from Essex County Airport (CDW). At the time the aircraft was still climbing out and had just received a radar target on Aircraft X. As they were approaching Lincoln Park Airport (N07) another target came up at their 12 o'clock same altitude. It appeared the targets were in very unsafe proximity to each other. Traffic alert was given to Aircraft X but not to the other aircraft that had flown into controlled airspace without 2 way radio communication. Radar coverage at CDW and N07 does not reach the ground; so a target is sometimes not picked up until they are climbing out of 1;500 feet.N07 is uncontrolled with less than a mile of uncontrolled airspace between N07 and CDW class D boundary. And without total radar coverage; the controllers at CDW are unable to safely give pilots traffic calls around N07 until aircraft become conflicts. I recommend that N07 departures and arrivals call CDW Tower before switching to UNICOM inbound and as soon as practical after takeoff. If pilots are made to make the proper communication and coordination; safety and efficiency will be improved exponentially.

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	1539499
Time
Date	201805
Local Time Of Day	1201-1800
Place
Locale Reference	CDW.Tower
State Reference	NJ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	Climb
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2.0
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Cdw controller reported issuing a traffic alert to a departing aircraft for traffic departing an adjacent uncontrolled airport where there is no radar coverage below 1;500 feet.