Air taxi pilot reported a near-mid-air-collision on approach to leb when another aircraft passed bel...

Attributes
ACN	1481083
Time
Date	201709
Local Time Of Day	0601-1200
Place
Locale Reference	ZBW.ARTCC
State Reference	NH
Aircraft 1
Make Model Name	Small Transport Low Wing 2 Recip Eng
Operating Under FAR Part	Part 135
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Horizontal 0 Vertical 200

Narrative:

During the ILS 18 approach at leb we began our descent when we captured the glideslope. When emerging from the cloud base we saw a small twin flying northeast across the approach course. We verified that the airplane was not climbing or performing any maneuvers other than straight and level flight. The airplane crossed below us approximately 200 feet below our altitude. We notified the tower and they informed us that they were not talking to anyone. The tower checked with boston center and found out that the aircraft was no longer under their control and was last under radar contact well east of the field. We continued our approach and landed without further incident.

Original NASA ASRS Text

Title: Air taxi pilot reported a near-mid-air-collision on approach to LEB when another aircraft passed below without communication.

Narrative: During the ILS 18 approach at LEB we began our descent when we captured the glideslope. When emerging from the cloud base we saw a small twin flying northeast across the approach course. We verified that the airplane was not climbing or performing any maneuvers other than straight and level flight. The airplane crossed below us approximately 200 feet below our altitude. We notified the tower and they informed us that they were not talking to anyone. The tower checked with Boston Center and found out that the aircraft was no longer under their control and was last under radar contact well east of the field. We continued our approach and landed without further incident.

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.

Air taxi pilot reported a near-mid-air-collision on approach to leb when another aircraft passed below without communication.