<< >> NASA ASRS Report 1383023, August 2016

S56 TRACON reported of an aircraft that descended prematurely causing a low altitude warning. Pilot was advised to climb up to assigned altitude.

Attributes
ACN	1383023
Time
Date	201608
Local Time Of Day	1801-2400
Place
Locale Reference	S56.TRACON
State Reference	UT
Aircraft 1
Make Model Name	B737-900
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X was vectored 5 degree left of course and to avoid traffic ahead on his RNAV course. He was told to expect to resume the RNAV and given a 'descend and maintain 13;000'. When traffic was [no] longer a factor; he was told to 'proceed direct quipa and resume the arrival'. Aircraft X took this as he needed to descend to because we told him to resume the arrival. Aircraft X was in a 127 MVA and descend below the assigned 130. An immediate low altitude alert was issued and the aircraft climbed immediately back to 130. (122 was the lowest observed).recommend pilots understanding the RNAV procedures better.

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Original NASA ASRS Text

Title: S56 TRACON reported of an aircraft that descended prematurely causing a low altitude warning. Pilot was advised to climb up to assigned altitude.

Narrative: Aircraft X was vectored 5 degree left of course and to avoid traffic ahead on his RNAV course. He was told to expect to resume the RNAV and given a 'descend and maintain 13;000'. When traffic was [no] longer a factor; he was told to 'proceed direct QUIPA and resume the arrival'. Aircraft X took this as he needed to descend to because we told him to resume the arrival. Aircraft X was in a 127 MVA and descend below the assigned 130. An immediate low altitude alert was issued and the aircraft climbed immediately back to 130. (122 was the lowest observed).Recommend pilots understanding the RNAV procedures better.

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.