An MD11 cargo crew accepts a climb from FL250 to FL330 when the controller's frequency change call was clipped and the crew heard only the pt 330 from controller at edff, first officer.

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Attributes
ACN	469050
Time
Date	200004
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : edff.tracon
State Reference	FO
Altitude	msl bound lower : 25000 msl bound upper : 25700
Environment
Flight Conditions	IMC
Weather Elements	Rain Turbulence
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 21500 flight time type : 3500
ASRS Report	469050
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Altitude deviation after clearance received. Female controller with very thick german accent issued clearance to FL330. First officer confirmed FL330. Through FL257 she came back issuing immediate descent to FL250. We queried her clearance to FL330. She said she never issued clearance and had handed us off to center frequency of 125.330. Apparently she was stepped on while she issued the frequency change and all we heard was .330. However the first officer had read back FL330 and asked if a 2000 ft rate of climb was still required. She replied, 'pilot's discretion out of FL250.'

Original NASA ASRS Text

Title: AN MD11 CARGO CREW ACCEPTS A CLB FROM FL250 TO FL330 WHEN THE CTLR'S FREQ CHANGE CALL WAS CLIPPED AND THE CREW HEARD ONLY THE PT 330 FROM CTLR AT EDFF, FO.

Narrative: ALTDEV AFTER CLRNC RECEIVED. FEMALE CTLR WITH VERY THICK GERMAN ACCENT ISSUED CLRNC TO FL330. FO CONFIRMED FL330. THROUGH FL257 SHE CAME BACK ISSUING IMMEDIATE DSCNT TO FL250. WE QUERIED HER CLRNC TO FL330. SHE SAID SHE NEVER ISSUED CLRNC AND HAD HANDED US OFF TO CTR FREQ OF 125.330. APPARENTLY SHE WAS STEPPED ON WHILE SHE ISSUED THE FREQ CHANGE AND ALL WE HEARD WAS .330. HOWEVER THE FO HAD READ BACK FL330 AND ASKED IF A 2000 FT RATE OF CLB WAS STILL REQUIRED. SHE REPLIED, 'PLT'S DISCRETION OUT OF FL250.'

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.