<< >> NASA ASRS Report 342740, July 1996

Communication poor. Misread altitude, assigned 9000 ft, but overshot by 1000 ft. No conflict. Light transport.

Attributes
ACN	342740
Time
Date	199607
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cle
State Reference	OH
Altitude	msl bound lower : 8000 msl bound upper : 9000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 110 flight time total : 6500 flight time type : 2000
ASRS Report	342740
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial
Experience	flight time total : 1520
ASRS Report	342387
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Center gave us descent clearance, but his transmission was barely readable. I read back 8000 ft assigned and put that into the altitude alerter. Center came back to us and repeated 9000 ft as the cleared altitude. I rogered 9000 ft, but failed to change the alerter. The aircraft on autoplt descended to 8000 ft. Center radioed (transmission again broken and barely readable) that 8000 ft was ok even though 9000 ft had been assigned. Contributing factor: poor radio reception.

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Original NASA ASRS Text

Title: COM POOR. MISREAD ALT, ASSIGNED 9000 FT, BUT OVERSHOT BY 1000 FT. NO CONFLICT. LTT.

Narrative: CTR GAVE US DSCNT CLRNC, BUT HIS XMISSION WAS BARELY READABLE. I READ BACK 8000 FT ASSIGNED AND PUT THAT INTO THE ALT ALERTER. CTR CAME BACK TO US AND REPEATED 9000 FT AS THE CLRED ALT. I ROGERED 9000 FT, BUT FAILED TO CHANGE THE ALERTER. THE ACFT ON AUTOPLT DSNDED TO 8000 FT. CTR RADIOED (XMISSION AGAIN BROKEN AND BARELY READABLE) THAT 8000 FT WAS OK EVEN THOUGH 9000 FT HAD BEEN ASSIGNED. CONTRIBUTING FACTOR: POOR RADIO RECEPTION.

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.