A B727-200 descending to FL240 was given radar vectors and told to climb to FL250. ARTCC had amended the descent clearance to maintain FL250 but had not received an acknowledgement.

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Attributes
ACN	432231
Time
Date	199903
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : vhp.vor
State Reference	IN
Altitude	msl single value : 24500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Boeing Company Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 800
ASRS Report	432231
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to assigned airspace
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

ZID issued clearance to descend to FL240. Captain acknowledged, first officer set altitude alerter to FL240 and captain confirmed with double point. Passing FL245, center transmitted 'confirm level at FL250.' captain responded 'negative, descending to FL240 assigned.' avoidance vectors were issued by center, and, as requested, we climbed to FL250. Subsequently, center transmitted, 'sorry, I thought I gave you FL250, but I see I had no response.' the amended altitude clearance may have been blocked by another radio transmission, however, such an amended clearance was neither received nor acknowledged by our aircraft.

Original NASA ASRS Text

Title: A B727-200 DSNDING TO FL240 WAS GIVEN RADAR VECTORS AND TOLD TO CLB TO FL250. ARTCC HAD AMENDED THE DSCNT CLRNC TO MAINTAIN FL250 BUT HAD NOT RECEIVED AN ACKNOWLEDGEMENT.

Narrative: ZID ISSUED CLRNC TO DSND TO FL240. CAPT ACKNOWLEDGED, FO SET ALT ALERTER TO FL240 AND CAPT CONFIRMED WITH DOUBLE POINT. PASSING FL245, CTR XMITTED 'CONFIRM LEVEL AT FL250.' CAPT RESPONDED 'NEGATIVE, DSNDING TO FL240 ASSIGNED.' AVOIDANCE VECTORS WERE ISSUED BY CTR, AND, AS REQUESTED, WE CLBED TO FL250. SUBSEQUENTLY, CTR XMITTED, 'SORRY, I THOUGHT I GAVE YOU FL250, BUT I SEE I HAD NO RESPONSE.' THE AMENDED ALT CLRNC MAY HAVE BEEN BLOCKED BY ANOTHER RADIO XMISSION, HOWEVER, SUCH AN AMENDED CLRNC WAS NEITHER RECEIVED NOR ACKNOWLEDGED BY OUR ACFT.

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.