Zan controller described an event when an aircraft was cleared for a RNAV(GPS) runway 36 to snp when...

Narrative:

Aircraft departed ZZZ; headed for snp; and asked for a RNAV(GPS) ry 36; which I gave. They had the NOTAMS and local WX and had gotten into ZZZ on a visual approach and had canceled IFR out of 4500 ft at ZZZ so weather was good. I was distracted with another issue with atop on and aircraft out of conformance and possible cpar failure en-route to sya from sector 13 so I forgot the RNAV (GPS) 18 and 36 was unusable from another abnormality; though it was listed on the outage sheet (green screen) as failed. It can't fail; but the listing does not list unusable only failed or OTS. The aircraft landed and canceled on the ground without incident; but it could have been an issue. The pilot should have had all the information; but must have missed the notice too. Recommendation; we need better and thorough notification of what's out and unusable to ensure the pilots know too. A RNAV (GPS) approach does not fail; but could be unusable for an abnormality and needs to be treated as such and listed as such.

Original NASA ASRS Text

Title: ZAN Controller described an event when an aircraft was cleared for a RNAV(GPS) Runway 36 to SNP when it was unusable; reporter alleged current procedure status information distribution is inadequate for both controller's and user's.

Narrative: Aircraft departed ZZZ; headed for SNP; and asked for a RNAV(GPS) RY 36; which I gave. They had the NOTAMS and local WX and had gotten into ZZZ on a visual approach and had canceled IFR out of 4500 ft at ZZZ so weather was good. I was distracted with another issue with ATOP on and aircraft out of conformance and possible CPAR failure en-route to SYA from sector 13 so I forgot the RNAV (GPS) 18 and 36 was unusable from another abnormality; though it was listed on the outage sheet (green screen) as failed. It can't fail; but the listing does not list unusable only failed or OTS. The aircraft landed and canceled on the ground without incident; but it could have been an issue. The pilot should have had all the information; but must have missed the notice too. Recommendation; we need better and thorough notification of what's out and unusable to ensure the pilots know too. A RNAV (GPS) approach does not fail; but could be unusable for an abnormality and needs to be treated as such and listed as such.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	860279
Time
Date	200911
Local Time Of Day	1801-2400
Place
Locale Reference	ZAN.ARTCC
State Reference	AK
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turboprop Eng
Operating Under FAR Part	Part 135
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Other / Unknown

Zan controller described an event when an aircraft was cleared for a RNAV(GPS) runway 36 to snp when it was unusable; reporter alleged current procedure status information distribution is inadequate for both controller's and user's.