ZDV controller reports of an aircraft that should not have been in rvsm airspace due to an equipment...

Attributes
ACN	1223131
Time
Date	201411
Local Time Of Day	0001-0600
Place
Locale Reference	ZDV.ARTCC
State Reference	CO
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3.75
Events
Anomaly	Aircraft Equipment Problem Less Severe Airspace Violation All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

Aircraft X checked on frequency and a few minutes later asked if slc center told us about a warning light. I advised him they didn't and asked what it was about. The pilot responded with there was a warning light about their rvsm status but all of his altimeters were working and showing him level at FL390. This answer led me to believe that he was still able to be in rvsm airspace and I advised him if any issues with any altimeters arose he would not be allowed to continue flight in rvsm airspace. While he was in the sector his flight path crossed another aircraft who was less than 5 miles and 1000 feet. It was determined later that aircraft X was not capable of rvsm and should have been descended into non-rvsm airspace.more of an understanding of what was going on with the aircraft at the time. If I would have understood that he needed to be descended at the time of him advising us then I would have done so; instead I treated it as just an advisory.

Original NASA ASRS Text

Title: ZDV Controller reports of an aircraft that should not have been in RVSM airspace due to an equipment problem related to the altimeters on the aircraft.

Narrative: Aircraft X checked on frequency and a few minutes later asked if SLC center told us about a warning light. I advised him they didn't and asked what it was about. The pilot responded with there was a warning light about their RVSM status but all of his altimeters were working and showing him level at FL390. This answer led me to believe that he was still able to be in RVSM airspace and I advised him if any issues with any altimeters arose he would not be allowed to continue flight in RVSM airspace. While he was in the sector his flight path crossed another aircraft who was less than 5 miles and 1000 feet. It was determined later that Aircraft X was not capable of RVSM and should have been descended into non-RVSM airspace.More of an understanding of what was going on with the aircraft at the time. If I would have understood that he needed to be descended at the time of him advising us then I would have done so; instead I treated it as just an advisory.

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.

ZDV controller reports of an aircraft that should not have been in rvsm airspace due to an equipment problem related to the altimeters on the aircraft.