<< >> NASA ASRS Report 524598, September 2001

B727 PIC accepts ZOA controller's clearance to descend to 7000 ft and fly at present speed -- 320 KTS. Next ZOA controller climbs aircraft back to 10000 ft and advises pervious controller's clearance is inappropriate.

Attributes
ACN	524598
Time
Date	200109
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zoa.artcc
State Reference	CA
Altitude	msl bound lower : 7000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa.artcc tower : sju.tower
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 198 flight time total : 15000 flight time type : 1800
ASRS Report	524598
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : company policies non adherence : clearance non adherence : far non adherence : published procedure other anomaly
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Just passing doyle intersection, we were cleared to 12000 ft. We were indicating 320 KTS. About wraps intersection, the controller told us to maintain present speed and descend to 7000 ft. I read back the clearance and the controller acknowledged. I didn't question the speed because of the current air traffic situation due to the terrorist problem, and I knew there were hardly any aircraft flying. About 2 mins later, the controller asked me my altitude. I told him 7000 ft assigned, 320 KTS. He told me to climb back to 10000 ft, and again I told him we were assigned 7000 ft and I was now climbing to 10000 ft. He said, 'don't worry about it.' when he turned me over to the next controller, he said sorry about the misunderstanding. I think the controller made a mistake in deleting the 250 KTS speed limit below 10000 ft.

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Original NASA ASRS Text

Title: B727 PIC ACCEPTS ZOA CTLR'S CLRNC TO DSND TO 7000 FT AND FLY AT PRESENT SPD -- 320 KTS. NEXT ZOA CTLR CLBS ACFT BACK TO 10000 FT AND ADVISES PERVIOUS CTLR'S CLRNC IS INAPPROPRIATE.

Narrative: JUST PASSING DOYLE INTXN, WE WERE CLRED TO 12000 FT. WE WERE INDICATING 320 KTS. ABOUT WRAPS INTXN, THE CTLR TOLD US TO MAINTAIN PRESENT SPD AND DSND TO 7000 FT. I READ BACK THE CLRNC AND THE CTLR ACKNOWLEDGED. I DIDN'T QUESTION THE SPD BECAUSE OF THE CURRENT AIR TFC SIT DUE TO THE TERRORIST PROB, AND I KNEW THERE WERE HARDLY ANY ACFT FLYING. ABOUT 2 MINS LATER, THE CTLR ASKED ME MY ALT. I TOLD HIM 7000 FT ASSIGNED, 320 KTS. HE TOLD ME TO CLB BACK TO 10000 FT, AND AGAIN I TOLD HIM WE WERE ASSIGNED 7000 FT AND I WAS NOW CLBING TO 10000 FT. HE SAID, 'DON'T WORRY ABOUT IT.' WHEN HE TURNED ME OVER TO THE NEXT CTLR, HE SAID SORRY ABOUT THE MISUNDERSTANDING. I THINK THE CTLR MADE A MISTAKE IN DELETING THE 250 KTS SPD LIMIT BELOW 10000 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.