Instructor pilot, with an instrument rating trainee, descended below assigned holding altitude during instrument training due to a misunderstanding of their clearance out of the holding pattern. Controller intervened and advised them that they had not been cleared to a lower altitude.

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Attributes
ACN	422510
Time
Date	199812
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sln
State Reference	KS
Altitude	msl bound lower : 4500 msl bound upper : 5000
Environment
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Route In Use	enroute airway : zkc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot instruction : instructor
Qualification	pilot : cfi pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 550 flight time type : 30
ASRS Report	422510
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Events
Anomaly	altitude deviation : excursion from assigned altitude
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

Holding at 5000 ft MSL over flory LOM, for the ILS runway 35 at sln, we were told to proceed direct sln VOR, descend and maintain 4000 ft MSL, expect approach clearance shortly. Descending through 4500 ft MSL, center asked assigned altitude of 5000 ft. I told him, negative descending assigned 4000 ft. The controller said I was never cleared to 4000 ft to maintain 5000 ft.

Original NASA ASRS Text

Title: INSTRUCTOR PLT, WITH AN INST RATING TRAINEE, DSNDED BELOW ASSIGNED HOLDING ALT DURING INST TRAINING DUE TO A MISUNDERSTANDING OF THEIR CLRNC OUT OF THE HOLDING PATTERN. CTLR INTERVENED AND ADVISED THEM THAT THEY HAD NOT BEEN CLRED TO A LOWER ALT.

Narrative: HOLDING AT 5000 FT MSL OVER FLORY LOM, FOR THE ILS RWY 35 AT SLN, WE WERE TOLD TO PROCEED DIRECT SLN VOR, DSND AND MAINTAIN 4000 FT MSL, EXPECT APCH CLRNC SHORTLY. DSNDING THROUGH 4500 FT MSL, CTR ASKED ASSIGNED ALT OF 5000 FT. I TOLD HIM, NEGATIVE DSNDING ASSIGNED 4000 FT. THE CTLR SAID I WAS NEVER CLRED TO 4000 FT TO MAINTAIN 5000 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.