Eug TRACON controller and an air carrier flight crew reported that the aircraft received an GPWS war...

Attributes
ACN	1505974
Time
Date	201712
Local Time Of Day	1801-2400
Place
Locale Reference	EUG.TRACON
State Reference	OR
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X checked on level at 12000 ft direct cegan; the IAF for VOR/DME C approach. Aircraft X was told to cross cegan at or above 7800 ft which is the MVA at cegan but the altitude to maintain inside of cegan on the DME arc is 10000 ft. Aircraft X crossed cegan at approximately 11000 ft cleared for the approach. After aircraft X crossed cegan at or above the altitude to maintain on the arc I expected him to fly the approach as he needed. Aircraft X descended below 10000 ft on the arc prior to fix brket but didn't set off any MSAW aural alerts. After crossing brket at approximately 8000 ft and turned onto the final approach course he reported a terrain alert and climbed to 11000 ft. Aircraft X was then vectored for the ILS runway 14 approach and landed without incident.I don't feel there is a systemic issue to resolve with this event other than miscommunication or misunderstanding what the pilot is supposed to do on that approach after crossing cegan well above the published altitude regardless of what at or above altitude had been issued. I had expected him to level at 10000 ft until brket.

Original NASA ASRS Text

Title: EUG TRACON Controller and an Air Carrier flight crew reported that the aircraft received an GPWS warning while on approach due to a lower that standard altitude issued.

Narrative: Aircraft X checked on level at 12000 ft direct CEGAN; the IAF for VOR/DME C approach. Aircraft X was told to cross CEGAN at or above 7800 ft which is the MVA at CEGAN but the altitude to maintain inside of CEGAN on the DME arc is 10000 ft. Aircraft X crossed CEGAN at approximately 11000 ft cleared for the approach. After Aircraft X crossed CEGAN at or above the altitude to maintain on the arc I expected him to fly the approach as he needed. Aircraft X descended below 10000 ft on the arc prior to fix BRKET but didn't set off any MSAW aural alerts. After crossing BRKET at approximately 8000 ft and turned onto the final approach course he reported a terrain alert and climbed to 11000 ft. Aircraft X was then vectored for the ILS RWY 14 approach and landed without incident.I don't feel there is a systemic issue to resolve with this event other than miscommunication or misunderstanding what the pilot is supposed to do on that approach after crossing CEGAN well above the published altitude regardless of what at or above altitude had been issued. I had expected him to level at 10000 ft until BRKET.

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.

Eug TRACON controller and an air carrier flight crew reported that the aircraft received an GPWS warning while on approach due to a lower that standard altitude issued.