<< >> NASA ASRS Report 385130, October 1997

A G4 climbs above cleared altitude because of not hearing clearance correctly. Many vectors and altitude changes were being issued at the time by ZNY, ny, ARTCC.

Attributes
ACN	385130
Time
Date	199710
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	msl bound lower : 15000 msl bound upper : 16800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10500
ASRS Report	385130
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During climb out from hpn en route to day we were given a series of vectors and climb clrncs. We had been cleared to 15000 ft when received (and read back) a clearance to FL250. The controller however wanted us to fly heading 250 degrees. Passing 15000 ft we were given a heading to 210 degrees (we were on approximately a 270 degree heading) and queried about our altitude. The controller instructed us to maintain 15000 ft and turn to heading 200 degrees. We descended back from approximately 16800 ft to 15000 ft. TCASII in our vicinity was clear of targets and no conflict with traffic was indicated. We were both reasonably sure we heard the climb clearance as FL250 and know for certain that that was what was read back. Workload and distractions in the cockpit were minimal but perhaps we just misheard the clearance because we were expecting a further climb clearance.

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Original NASA ASRS Text

Title: A G4 CLBS ABOVE CLRED ALT BECAUSE OF NOT HEARING CLRNC CORRECTLY. MANY VECTORS AND ALT CHANGES WERE BEING ISSUED AT THE TIME BY ZNY, NY, ARTCC.

Narrative: DURING CLBOUT FROM HPN ENRTE TO DAY WE WERE GIVEN A SERIES OF VECTORS AND CLB CLRNCS. WE HAD BEEN CLRED TO 15000 FT WHEN RECEIVED (AND READ BACK) A CLRNC TO FL250. THE CTLR HOWEVER WANTED US TO FLY HDG 250 DEGS. PASSING 15000 FT WE WERE GIVEN A HDG TO 210 DEGS (WE WERE ON APPROX A 270 DEG HDG) AND QUERIED ABOUT OUR ALT. THE CTLR INSTRUCTED US TO MAINTAIN 15000 FT AND TURN TO HDG 200 DEGS. WE DSNDED BACK FROM APPROX 16800 FT TO 15000 FT. TCASII IN OUR VICINITY WAS CLR OF TARGETS AND NO CONFLICT WITH TFC WAS INDICATED. WE WERE BOTH REASONABLY SURE WE HEARD THE CLB CLRNC AS FL250 AND KNOW FOR CERTAIN THAT THAT WAS WHAT WAS READ BACK. WORKLOAD AND DISTRACTIONS IN THE COCKPIT WERE MINIMAL BUT PERHAPS WE JUST MISHEARD THE CLRNC BECAUSE WE WERE EXPECTING A FURTHER CLB CLRNC.

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.