Center control showed flight at 27400. Flight crew switched transponders and control showed FL270. Traffic was at FL280 with TCAS that confirmed reporter was FL270.

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Attributes
ACN	185483
Time
Date	199108
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : day
State Reference	OH
Altitude	msl bound lower : 27000 msl bound upper : 27400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 2000
ASRS Report	185483
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 120 flight time total : 15000 flight time type : 1800
ASRS Report	185480
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other controllera other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At level flight (27000 ft), center queried us on our altitude. (They showed us at 27400.) a few seconds later, we switched transponders and they showed us at 27000 ft. Another aircraft on frequency (at FL280) confirmed he had us at FL270 through his TCAS unit. We wrote up transponder that was in question and continued with no further problems utilizing #2 transponder. Controller said there was no problem in this particular instance.

Original NASA ASRS Text

Title: CENTER CTL SHOWED FLT AT 27400. FLC SWITCHED TRANSPONDERS AND CTL SHOWED FL270. TFC WAS AT FL280 WITH TCAS THAT CONFIRMED RPTR WAS FL270.

Narrative: AT LEVEL FLT (27000 FT), CENTER QUERIED US ON OUR ALT. (THEY SHOWED US AT 27400.) A FEW SECONDS LATER, WE SWITCHED TRANSPONDERS AND THEY SHOWED US AT 27000 FT. ANOTHER ACFT ON FREQ (AT FL280) CONFIRMED HE HAD US AT FL270 THROUGH HIS TCAS UNIT. WE WROTE UP TRANSPONDER THAT WAS IN QUESTION AND CONTINUED WITH NO FURTHER PROBLEMS UTILIZING #2 TRANSPONDER. CTLR SAID THERE WAS NO PROBLEM IN THIS PARTICULAR INSTANCE.

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.