A B727 air carrier flight crew reported that they received a clearance to descend to FL240. As they were descending through FL286, the controller intervened and told them to maintain FL290. The controller stated that his original intention was to have the B727 descend from FL330 to FL290.

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Attributes
ACN	329990
Time
Date	199603
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ogd
State Reference	UT
Altitude	msl bound lower : 24000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zlc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 6000
ASRS Report	329990
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 3000
ASRS Report	329991
Events
Anomaly	non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Captain requested lower altitude from FL330 and center cleared us to descend to FL240. Captain read back clearance to FL240 and first officer acknowledged and set 24000 ft in altitude alerter. Passing FL286 center called and said to level at FL290. We responded by climbing back to FL290. Center then cleared us to FL260. Center said there was a miscom, and that he originally wanted us to go to FL290 from FL330. Supplemental information from acn 329991: he said we were cleared to FL290 and that it was a miscom on both our parts.

Original NASA ASRS Text

Title: A B727 ACR FLC RPTED THAT THEY RECEIVED A CLRNC TO DSND TO FL240. AS THEY WERE DSNDING THROUGH FL286, THE CTLR INTERVENED AND TOLD THEM TO MAINTAIN FL290. THE CTLR STATED THAT HIS ORIGINAL INTENTION WAS TO HAVE THE B727 DSND FROM FL330 TO FL290.

Narrative: CAPT REQUESTED LOWER ALT FROM FL330 AND CTR CLRED US TO DSND TO FL240. CAPT READ BACK CLRNC TO FL240 AND FO ACKNOWLEDGED AND SET 24000 FT IN ALT ALERTER. PASSING FL286 CTR CALLED AND SAID TO LEVEL AT FL290. WE RESPONDED BY CLBING BACK TO FL290. CTR THEN CLRED US TO FL260. CTR SAID THERE WAS A MISCOM, AND THAT HE ORIGINALLY WANTED US TO GO TO FL290 FROM FL330. SUPPLEMENTAL INFO FROM ACN 329991: HE SAID WE WERE CLRED TO FL290 AND THAT IT WAS A MISCOM ON BOTH OUR PARTS.

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.