Narrative:

Aircraft was enroute VFR; pilot stated they started to encounter mist and decided they better go IFR. Pilot requested and received an IFR clearance from center sector xx. A relief briefing then took place at rxx. Ten minutes after the pilot requested IFR and requested direct [their destination]. A minute later; the pilot stated they needed to divert. At this point the aircraft was at [fl]130. Controller issued direct [a nearby airport]. The controller asked the pilot what type of icing he was getting; the pilot stated it was just a trace of rime. A short time later the controller asked [the C172] if he wanted lower. The pilot stated he did and the controller gave the aircraft [fl]110. As the aircraft started the descent the MSAW alert activated the aircraft was a mile north of a 128 tav (eram terrain alert volume) heading towards pilot peak a 10;716 ft mountain. As the aircraft passed into the 128 tav the controller asked the pilot to climb to 130. The pilot stated he would rather not but accepted the clearance. The controller did not issue a low altitude alert. A minute later the pilot stated he was unable to climb and was in a descent. At first the pilot stated it was icing. The controller issue a 180 turn to exit the 128 tav. At this point the aircraft is one mile north of pilot peak at [fl]108. The aircraft then experiences mountain wave and pilot stated he was in an uncontrolled climb and then descent aircraft was observed at 096 in a 128 tav. The pilot regained control of the aircraft and the further north he got from the peak was able to climb back to [fl]110. The controller then vectored the aircraft around the 128 tav. The aircraft exited the snow and was in the clear just north of [the divert airport]. The pilot stated they had [the airport] in sight and the controller issued a visual approach. The aircraft was still over restricted airspace hot from sfc to 100. The aircraft did not enter the restricted airspace on the visual but did in the mountain wave event earlier. Controller knowledge of tav's and requirements of actions needed when aircraft below mia.

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Original NASA ASRS Text

Title: Enroute Controller described a below MIA event involving an aircraft encountering icing and a controller issuing an incorrect routing.

Narrative: Aircraft was enroute VFR; pilot stated they started to encounter mist and decided they better go IFR. Pilot requested and received an IFR clearance from Center Sector XX. A relief briefing then took place at RXX. Ten minutes after the pilot requested IFR and requested direct [their destination]. A minute later; the pilot stated they needed to divert. At this point the aircraft was at [FL]130. Controller issued direct [a nearby airport]. The Controller asked the pilot what type of icing he was getting; the pilot stated it was just a trace of rime. A short time later the Controller asked [the C172] if he wanted lower. The pilot stated he did and the Controller gave the aircraft [FL]110. As the aircraft started the descent the MSAW alert activated the aircraft was a mile north of a 128 TAV (ERAM Terrain Alert Volume) heading towards pilot peak a 10;716 FT mountain. As the aircraft passed into the 128 TAV the Controller asked the pilot to climb to 130. The pilot stated he would rather not but accepted the clearance. The Controller did not issue a low altitude alert. A minute later the pilot stated he was unable to climb and was in a descent. At first the pilot stated it was icing. The Controller issue a 180 turn to exit the 128 TAV. At this point the aircraft is one mile north of pilot peak at [FL]108. The aircraft then experiences mountain wave and pilot stated he was in an uncontrolled climb and then descent aircraft was observed at 096 in a 128 TAV. The pilot regained control of the aircraft and the further north he got from the peak was able to climb back to [FL]110. The Controller then vectored the aircraft around the 128 TAV. The aircraft exited the snow and was in the clear just north of [the divert airport]. The pilot stated they had [the airport] in sight and the Controller issued a visual approach. The aircraft was still over restricted airspace hot from SFC to 100. The aircraft did not enter the restricted airspace on the visual but did in the mountain wave event earlier. Controller knowledge of TAV's and requirements of actions needed when aircraft below MIA.

Data retrieved from NASA's ASRS site as of July 2013 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.