B737 aircraft with reporter captain off the radios contacting his company when ATC cleared them to higher altitude which first officer heard as FL350. Controller intervened and questioned the cleared altitude, but said no problem.

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Attributes
ACN	391880
Time
Date	199801
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zjx
State Reference	FL
Altitude	msl bound lower : 33000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 14000 flight time type : 4000
ASRS Report	391880
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Captain off of radio with company callback of departure times and estimates when ATC cleared flight to FL350 (overheard later ATC discussion). First officer heard and we believe read back FL350 as the altitude. Captain came back on line in time to hear ATC question the clearance altitude and advise that it was 'no problem.' discussion among pilots confirmed some confusion about clearance and actions while single pilot operating (first officer leg). Corrections: offline pilot stay on ATC also. Use ACARS or similar automatic system for company communications.

Original NASA ASRS Text

Title: B737 ACFT WITH RPTR CAPT OFF THE RADIOS CONTACTING HIS COMPANY WHEN ATC CLRED THEM TO HIGHER ALT WHICH FO HEARD AS FL350. CTLR INTERVENED AND QUESTIONED THE CLRED ALT, BUT SAID NO PROB.

Narrative: CAPT OFF OF RADIO WITH COMPANY CALLBACK OF DEP TIMES AND ESTIMATES WHEN ATC CLRED FLT TO FL350 (OVERHEARD LATER ATC DISCUSSION). FO HEARD AND WE BELIEVE READ BACK FL350 AS THE ALT. CAPT CAME BACK ON LINE IN TIME TO HEAR ATC QUESTION THE CLRNC ALT AND ADVISE THAT IT WAS 'NO PROB.' DISCUSSION AMONG PLTS CONFIRMED SOME CONFUSION ABOUT CLRNC AND ACTIONS WHILE SINGLE PLT OPERATING (FO LEG). CORRECTIONS: OFFLINE PLT STAY ON ATC ALSO. USE ACARS OR SIMILAR AUTOMATIC SYS FOR COMPANY COMS.

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.