Uncertainty over altitude crossing restr led to 2000 ft high crossing.

Attributes
ACN	316179
Time
Date	199509
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lal
State Reference	FL
Altitude	msl bound lower : 13000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma tracon : msy
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : zma
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 2000
ASRS Report	316179
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 350 flight time total : 15000 flight time type : 3000
ASRS Report	316825
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were given a clearance to cross andro intersection at 13000 ft. The captain read back 13000 ft. I thought the clearance was 15000 ft. As we leveled at 15000 ft, we discussed the altitude and attempted to call center and confirm. The frequency was busy and we could not confirm the altitude until past the intersection. When we did, they confirmed 13000 ft. We descended as quickly as possible to 13000 ft.

Original NASA ASRS Text

Title: UNCERTAINTY OVER ALT XING RESTR LED TO 2000 FT HIGH XING.

Narrative: WE WERE GIVEN A CLRNC TO CROSS ANDRO INTXN AT 13000 FT. THE CAPT READ BACK 13000 FT. I THOUGHT THE CLRNC WAS 15000 FT. AS WE LEVELED AT 15000 FT, WE DISCUSSED THE ALT AND ATTEMPTED TO CALL CTR AND CONFIRM. THE FREQ WAS BUSY AND WE COULD NOT CONFIRM THE ALT UNTIL PAST THE INTXN. WHEN WE DID, THEY CONFIRMED 13000 FT. WE DSNDED AS QUICKLY AS POSSIBLE TO 13000 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.