<< >> NASA ASRS Report 483750, August 2000

An air carrier flight crew reports leaving their assigned altitude after hearing and then acknowledging a clearance to climb that was later disputed by ATC.

Attributes
ACN	483750
Time
Date	200008
Day	Tue
Local Time Of Day	0601 To 1200
Place
State Reference	FL
Altitude	msl single value : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 1 flight time total : 20400 flight time type : 240
ASRS Report	483750
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : became reoriented none taken : detected after the fact
Supplementary
Problem Areas	ATC Human Performance FAA Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approximately 35 NM northwest of cty VOR, we were given clearance to climb from 15000 ft to 17000 ft. We acknowledged the clearance with 'roger, leaving 15000 ft for 17000 ft.' approximately 1 min later, we were told to level at 16000 ft stating our assigned altitude was 15000 ft. We questioned the controller, as both crew members heard the clearance. The only response we were able to get was 'ok.'

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Original NASA ASRS Text

Title: AN ACR FLC RPTS LEAVING THEIR ASSIGNED ALT AFTER HEARING AND THEN ACKNOWLEDGING A CLRNC TO CLB THAT WAS LATER DISPUTED BY ATC.

Narrative: APPROX 35 NM NW OF CTY VOR, WE WERE GIVEN CLRNC TO CLB FROM 15000 FT TO 17000 FT. WE ACKNOWLEDGED THE CLRNC WITH 'ROGER, LEAVING 15000 FT FOR 17000 FT.' APPROX 1 MIN LATER, WE WERE TOLD TO LEVEL AT 16000 FT STATING OUR ASSIGNED ALT WAS 15000 FT. WE QUESTIONED THE CTLR, AS BOTH CREW MEMBERS HEARD THE CLRNC. THE ONLY RESPONSE WE WERE ABLE TO GET WAS 'OK.'

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.