<< >> NASA ASRS Report 336123, May 1996

While descending close to the airport, an SF34 flight crew misunderstood their assigned clearance altitude and were 300 ft low when the approach controller intervened. The approach controller assigned a lower altitude.

Attributes
ACN	336123
Time
Date	199605
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 3700 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 216 flight time total : 9500 flight time type : 4000
ASRS Report	336123
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 18000 flight time type : 90
ASRS Report	335820
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Assigned by ATC to descend from 5000 ft to 3000 ft. On our descent through 3700 ft the controller advised he assigned us 4000 ft. He then advised us to continue our descent to 1500 ft. The PNF had read back our assigned altitude of 3000 ft. The ATC controller made an error on our altitude assignment. There was no aircraft conflict, TCASII alert, or any other aircraft deviations from the missed assigned altitude.

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Original NASA ASRS Text

Title: WHILE DSNDING CLOSE TO THE ARPT, AN SF34 FLC MISUNDERSTOOD THEIR ASSIGNED CLRNC ALT AND WERE 300 FT LOW WHEN THE APCH CTLR INTERVENED. THE APCH CTLR ASSIGNED A LOWER ALT.

Narrative: ASSIGNED BY ATC TO DSND FROM 5000 FT TO 3000 FT. ON OUR DSCNT THROUGH 3700 FT THE CTLR ADVISED HE ASSIGNED US 4000 FT. HE THEN ADVISED US TO CONTINUE OUR DSCNT TO 1500 FT. THE PNF HAD READ BACK OUR ASSIGNED ALT OF 3000 FT. THE ATC CTLR MADE AN ERROR ON OUR ALT ASSIGNMENT. THERE WAS NO ACFT CONFLICT, TCASII ALERT, OR ANY OTHER ACFT DEVS FROM THE MISSED ASSIGNED ALT.

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.