Narrative:

While I was working local control/ground control combined; I overheard the non-radar approach controller approve a request from the ZLC sector 31 controller to have aircraft X descending to 9;000 feet direct gabby from the southeast for an ILS approach. The IFR flight progress strip clearly showed the projected inbound radial of aircraft X to be in a 9500 foot minimum IFR altitude (mia).when the aircraft X came over to approach's frequency; the approach controller issued a clearance to aircraft X to 'cross gabby at or above 9'000 feet cleared for ILS approach.' the weather was such that there were low ceilings to the southeast and it was obvious the aircraft was did not have visual contact with the ground. There is a misnomer in this facility that 'if it works for the center then it must be ok for us' or; 'if the center makes a particular request (usually altitude related) then it must be ok since the center asked for it.' I've had this same situation happen before this controller and other controllers and I advised them to speak to competent authority to get the authorizing IFR aircraft below the mia issue resolved. Their response is 'I talked to other controllers or see other controllers do the same thing.'our letter of agreement with ZLC clearly shows what altitudes aircraft will be assigned over coordination fixes. The one referenced above says aircraft will be descending to 11;000 feet or instructed to cross gabby at 11;000 feet. This should be adhered to as it causes confusion when a lower altitude is requested that is below our mia's; but the center says that that altitude request meets their mia's. Have the appropriate center officials compare their mia charts with twf's mia charts to identify/correct discrepancies.

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Original NASA ASRS Text

Title: TWF Approach controllers approved an aircraft entering their airspace at an altitude below their Minimum Vectoring Altitude.

Narrative: While I was working local control/ground control combined; I overheard the non-radar approach controller approve a request from the ZLC sector 31 controller to have Aircraft X descending to 9;000 feet direct GABBY from the southeast for an ILS approach. The IFR flight progress strip clearly showed the projected inbound radial of Aircraft X to be in a 9500 foot Minimum IFR Altitude (MIA).When the Aircraft X came over to approach's frequency; the approach controller issued a clearance to Aircraft X to 'cross GABBY at or above 9'000 feet cleared for ILS approach.' the weather was such that there were low ceilings to the southeast and it was obvious the aircraft was did not have visual contact with the ground. There is a misnomer in this facility that 'if it works for the center then it must be ok for us' or; 'if the center makes a particular request (usually altitude related) then it must be ok since the center asked for it.' I've had this same situation happen before this controller and other controllers and I advised them to speak to competent authority to get the authorizing IFR aircraft below the MIA issue resolved. Their response is 'I talked to other controllers or see other controllers do the same thing.'Our letter of agreement with ZLC clearly shows what altitudes aircraft will be assigned over coordination fixes. The one referenced above says aircraft will be descending to 11;000 feet or instructed to cross GABBY at 11;000 feet. This should be adhered to as it causes confusion when a lower altitude is requested that is below our MIA'S; but the center says that that altitude request meets their MIA'S. Have the appropriate center officials compare their MIA charts with TWF'S MIA charts to identify/correct discrepancies.

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.