C150 pilot expressed concern that ads-B outages are not always notamed properly.

Attributes
ACN	1358530
Time
Date	201605
Local Time Of Day	0601-1200
Place
Locale Reference	DSV.Airport
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 150
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 3500 Flight Crew Type 3300
Events
Anomaly	ATC Issue All Types Ground Event / Encounter Other / Unknown

Narrative:

VFR flight from to dsv. Aircraft is equipped with automatic dependent surveillance-broadcast (ads-B) in and out. During both flights and multiple times each flight traffic information system (tis) traffic was not displayed in spite of the receiver indicating a good ads-B signal. I spoke with a radar technician at roc TRACON and inquired if there had been any equipment malfunctions with tis. He checked the equipment logs and advised that the hornell ads-B ground station (4g6) indicated frequent data loss. I found no NOTAM issued by itt as required. Itt did not notify roc tech ops as required. Situation went unresolved until at least [two days later].contractor (itt) should be compelled to notify all users when a malfunction occurs.

Original NASA ASRS Text

Title: C150 pilot expressed concern that ADS-B outages are not always NOTAMed properly.

Narrative: VFR flight from to DSV. Aircraft is equipped with Automatic Dependent Surveillance-Broadcast (ADS-B) In and Out. During both flights and multiple times each flight Traffic Information System (TIS) traffic was not displayed in spite of the receiver indicating a good ADS-B signal. I spoke with a radar technician at ROC TRACON and inquired if there had been any equipment malfunctions with TIS. He checked the equipment logs and advised that the Hornell ADS-B Ground Station (4G6) indicated frequent data loss. I found no NOTAM issued by ITT as required. ITT did not notify ROC Tech Ops as required. Situation went unresolved until at least [two days later].Contractor (ITT) should be compelled to notify all users when a malfunction occurs.

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.