<< >> NASA ASRS Report 473700, May 2000

A C550 PIC descends out of his cleared altitude of 12000 ft when he fails to hear the amended clearance 20 mi north of eca, ca.

Attributes
ACN	473700
Time
Date	200005
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : eca.vortac
State Reference	CA
Altitude	msl bound lower : 11600 msl bound upper : 12000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa.artcc
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 110 flight time total : 6100
ASRS Report	473700
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	Other
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Given 12000 ft, then 11000 ft, then 12000 ft in 30-60 seconds. Didn't hear 12000 ft, went to 11600 ft before the controller advised 12000 ft.

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Original NASA ASRS Text

Title: A C550 PIC DSNDS OUT OF HIS CLRED ALT OF 12000 FT WHEN HE FAILS TO HEAR THE AMENDED CLRNC 20 MI N OF ECA, CA.

Narrative: GIVEN 12000 FT, THEN 11000 FT, THEN 12000 FT IN 30-60 SECONDS. DIDN'T HEAR 12000 FT, WENT TO 11600 FT BEFORE THE CTLR ADVISED 12000 FT.

Data retrieved from NASA's ASRS site as of July 2007 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.