<< >> NASA ASRS Report 1613488, January 2019

TRACON controller reported an aircraft descended quicker than anticipated and flew below the minimum vectoring altitude.

Attributes
ACN	1613488
Time
Date	201901
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Heavy Transport
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Function	Approach Instructor
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

I was training a developmental on his first sector in our area. Aircraft X was on a left downwind at 5100 feet. There was an aircraft on an RNAV arrival that was going to be second. The developmental turned aircraft X on a base and descended him to 3000 feet because he was anticipating that aircraft X wasn't going to descend into the 4700 foot minimum vectoring altitude (MVA). Aircraft X descended quite rapidly and clipped the 4700 foot MVA at around 4400 feet. I didn't expect aircraft X to descend so quickly. I will make sure the developmental uses the appropriate altitudes and not use anticipation.

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Original NASA ASRS Text

Title: TRACON Controller reported an aircraft descended quicker than anticipated and flew below the Minimum Vectoring Altitude.

Narrative: I was training a developmental on his first sector in our area. Aircraft X was on a left downwind at 5100 feet. There was an aircraft on an RNAV Arrival that was going to be second. The developmental turned Aircraft X on a base and descended him to 3000 feet because he was anticipating that Aircraft X wasn't going to descend into the 4700 foot Minimum Vectoring Altitude (MVA). Aircraft X descended quite rapidly and clipped the 4700 foot MVA at around 4400 feet. I didn't expect Aircraft X to descend so quickly. I will make sure the developmental uses the appropriate altitudes and not use anticipation.

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.