<< >> NASA ASRS Report 503761, March 2001

B350 crew descended below the controller's intended altitude because the controller did not detect a readback hearback problem.

Attributes
ACN	503761
Time
Date	200103
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : mcn.vortac
State Reference	GA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc tower : mht.tower
Operator	general aviation : corporate
Make Model Name	Super King Air 350
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 12500 flight time type : 2100
ASRS Report	503761
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 485 flight time type : 20
ASRS Report	504130
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

While descending into lzu, center gave crossing restr to tuckr intersection. Crew understood to cross at 10000 ft MSL and acknowledged that altitude. Upon reaching approximately 10300 ft MSL, center asked altitude and stated it was 11000 ft MSL at tuckr. Center said it was his fault for not catching wrong altitude readback. There was no traffic conflict.

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Original NASA ASRS Text

Title: B350 CREW DSNDED BELOW THE CTLR'S INTENDED ALT BECAUSE THE CTLR DID NOT DETECT A READBACK HEARBACK PROB.

Narrative: WHILE DSNDING INTO LZU, CTR GAVE XING RESTR TO TUCKR INTXN. CREW UNDERSTOOD TO CROSS AT 10000 FT MSL AND ACKNOWLEDGED THAT ALT. UPON REACHING APPROX 10300 FT MSL, CTR ASKED ALT AND STATED IT WAS 11000 FT MSL AT TUCKR. CTR SAID IT WAS HIS FAULT FOR NOT CATCHING WRONG ALT READBACK. THERE WAS NO TFC CONFLICT.

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.