An MDS80 crew submitted reports describing a hearback readback incident with ZLA, which resulted in ...

Attributes
ACN	453619
Time
Date	199910
Day	Sun
Local Time Of Day	1201 To 1800
Place
State Reference	AZ
Altitude	msl bound lower : 11000 msl bound upper : 12000
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	453619
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	453620
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

On check-in with ZLA, we were cleared in 1 transmission to FL230, then cross 40 NM west of pgs at 10000 ft 250 KTS and altimeter 30.19. We read it back exactly. Descending through 11000 ft, we were told to climb back to 12000 ft as cleared. We did so, but said we had read back 10000 ft and it was acknowledged by ATC. He said no harm. No foul. If the controller's first transmission had not been so extensive we may have caught the misunderstanding.

Original NASA ASRS Text

Title: AN MDS80 CREW SUBMITTED RPTS DESCRIBING A HEARBACK READBACK INCIDENT WITH ZLA, WHICH RESULTED IN AN ALT BUST.

Narrative: ON CHK-IN WITH ZLA, WE WERE CLRED IN 1 XMISSION TO FL230, THEN CROSS 40 NM W OF PGS AT 10000 FT 250 KTS AND ALTIMETER 30.19. WE READ IT BACK EXACTLY. DSNDING THROUGH 11000 FT, WE WERE TOLD TO CLB BACK TO 12000 FT AS CLRED. WE DID SO, BUT SAID WE HAD READ BACK 10000 FT AND IT WAS ACKNOWLEDGED BY ATC. HE SAID NO HARM. NO FOUL. IF THE CTLR'S FIRST XMISSION HAD NOT BEEN SO EXTENSIVE WE MAY HAVE CAUGHT THE MISUNDERSTANDING.

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.

An MDS80 crew submitted reports describing a hearback readback incident with ZLA, which resulted in an altitude bust.