Altitude overshot when ATC does not catch an improper readback.

Attributes
ACN	535056
Time
Date	200201
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zny.artcc
State Reference	NY
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : holding
Route In Use	arrival : holding pattern arrival star : bunts
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	535056
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	535052
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : published procedure
Independent Detector	other controllerb
Resolutory Action	controller : issued advisory controller : issued new clearance flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Ord to phl, I was flying the leg, just west of tragg intersection at 16000 ft on the bunts 1 arrival, ZNY (133.67). Was handling many aircraft on frequency when he gave us holding at bunts as depicted, on the arrival, at 10000 ft, efc of XA50Z. ZNY cleared us to 10000 ft. During descent, the captain did a PA. I had radio #1 and the aircraft. No further clrncs were given at this time. The captain returned around 11000 ft. I asked if 10000 ft was our cleared altitude. He said yes, and we continued to 10000 ft. Just as we leveled at 10000 ft, ZNY asked what our altitude was, and we replied 10000 ft. He said that our clearance was 11000 ft. We then asked if he wanted us back to 11000 ft. He said yes and we climbed to 11000 ft.

Original NASA ASRS Text

Title: ALT OVERSHOT WHEN ATC DOES NOT CATCH AN IMPROPER READBACK.

Narrative: ORD TO PHL, I WAS FLYING THE LEG, JUST W OF TRAGG INTXN AT 16000 FT ON THE BUNTS 1 ARR, ZNY (133.67). WAS HANDLING MANY ACFT ON FREQ WHEN HE GAVE US HOLDING AT BUNTS AS DEPICTED, ON THE ARR, AT 10000 FT, EFC OF XA50Z. ZNY CLRED US TO 10000 FT. DURING DSCNT, THE CAPT DID A PA. I HAD RADIO #1 AND THE ACFT. NO FURTHER CLRNCS WERE GIVEN AT THIS TIME. THE CAPT RETURNED AROUND 11000 FT. I ASKED IF 10000 FT WAS OUR CLRED ALT. HE SAID YES, AND WE CONTINUED TO 10000 FT. JUST AS WE LEVELED AT 10000 FT, ZNY ASKED WHAT OUR ALT WAS, AND WE REPLIED 10000 FT. HE SAID THAT OUR CLRNC WAS 11000 FT. WE THEN ASKED IF HE WANTED US BACK TO 11000 FT. HE SAID YES AND WE CLBED TO 11000 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.