Altitude deviation altitude excursion from assigned as FK100 crew had clearance interpretation readback hearback problem. Potential conflict less than standard separation.

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Attributes
ACN	344052
Time
Date	199608
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdc
State Reference	DC
Altitude	msl bound lower : 28000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 18000 flight time type : 1800
ASRS Report	344052
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 160 flight time total : 14000 flight time type : 500
ASRS Report	344060
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Being vectored for spacing, given clear to climb from our altitude of FL270. Thought new altitude given was FL330 (filed altitude). Read back FL330 and inserted in fmp. During climb in turn to assigned heading, controller asked what altitude we were climbing to and I answered FL330. He said we were given FL280. Got TA on TCASII as we passed about 4 NM behind other aircraft that was at FL290. Called ATC from lga and talked to supervisor. He said he had listened to tape and said we were given FL280 but read back FL330 and controller did not catch the incorrect readback. First officer also thought FL330 was given to us as we confirmed altitude as per company policy. Lots of chatter on frequency. Could have heard another aircraft stepping on ATC and therefore misheard the correct altitude.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION FROM ASSIGNED AS FK100 CREW HAD CLRNC INTERP READBACK HEARBACK PROB. POTENTIAL CONFLICT LTSS.

Narrative: BEING VECTORED FOR SPACING, GIVEN CLR TO CLB FROM OUR ALT OF FL270. THOUGHT NEW ALT GIVEN WAS FL330 (FILED ALT). READ BACK FL330 AND INSERTED IN FMP. DURING CLB IN TURN TO ASSIGNED HDG, CTLR ASKED WHAT ALT WE WERE CLBING TO AND I ANSWERED FL330. HE SAID WE WERE GIVEN FL280. GOT TA ON TCASII AS WE PASSED ABOUT 4 NM BEHIND OTHER ACFT THAT WAS AT FL290. CALLED ATC FROM LGA AND TALKED TO SUPVR. HE SAID HE HAD LISTENED TO TAPE AND SAID WE WERE GIVEN FL280 BUT READ BACK FL330 AND CTLR DID NOT CATCH THE INCORRECT READBACK. FO ALSO THOUGHT FL330 WAS GIVEN TO US AS WE CONFIRMED ALT AS PER COMPANY POLICY. LOTS OF CHATTER ON FREQ. COULD HAVE HEARD ANOTHER ACFT STEPPING ON ATC AND THEREFORE MISHEARD THE CORRECT ALT.

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.