Approach controller alerts flight crew of possible altitude deviation as mode C showed aircraft 1000 ft below clearance altitude. Flight crew recycled transponder.

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Attributes
ACN	359290
Time
Date	199701
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cle
State Reference	OH
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cle
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : atp pilot : cfi pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 16000 flight time type : 8700
ASRS Report	359290
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 14000 flight time type : 1300
ASRS Report	359375
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	aircraft : equipment problem dissipated flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While being vectored for ILS runway 23L at cle, approach control advised us to climb back up to 7000 ft. I replied that we were level at 7000 ft and verified the local altimeter setting of 30.49 from ATIS. Cle approach said that 30.51 was the new setting and that we had traffic at 12 O'clock and 15 mi at 6000 ft. At that time no traffic was observed either visually or on our TCASII by us. No other comments were made about our altitude. We were then switched to the final controller for vectors to the ILS. The final controller verified that he showed our altitude at 7000 ft. We then continued on the ILS and landed without further question. Supplemental information from acn 359375: we recycled our transponder. This controller turned us over to the final approach controller. After signing on we asked if he showed us level at 7000 ft. His reply was affirmative. We changed nothing during this time except to select 30.51 on our altimeters, a 20 ft difference, and recycle our transponder.

Original NASA ASRS Text

Title: APCH CTLR ALERTS FLC OF POSSIBLE ALTDEV AS MODE C SHOWED ACFT 1000 FT BELOW CLRNC ALT. FLC RECYCLED XPONDER.

Narrative: WHILE BEING VECTORED FOR ILS RWY 23L AT CLE, APCH CTL ADVISED US TO CLB BACK UP TO 7000 FT. I REPLIED THAT WE WERE LEVEL AT 7000 FT AND VERIFIED THE LCL ALTIMETER SETTING OF 30.49 FROM ATIS. CLE APCH SAID THAT 30.51 WAS THE NEW SETTING AND THAT WE HAD TFC AT 12 O'CLOCK AND 15 MI AT 6000 FT. AT THAT TIME NO TFC WAS OBSERVED EITHER VISUALLY OR ON OUR TCASII BY US. NO OTHER COMMENTS WERE MADE ABOUT OUR ALT. WE WERE THEN SWITCHED TO THE FINAL CTLR FOR VECTORS TO THE ILS. THE FINAL CTLR VERIFIED THAT HE SHOWED OUR ALT AT 7000 FT. WE THEN CONTINUED ON THE ILS AND LANDED WITHOUT FURTHER QUESTION. SUPPLEMENTAL INFO FROM ACN 359375: WE RECYCLED OUR XPONDER. THIS CTLR TURNED US OVER TO THE FINAL APCH CTLR. AFTER SIGNING ON WE ASKED IF HE SHOWED US LEVEL AT 7000 FT. HIS REPLY WAS AFFIRMATIVE. WE CHANGED NOTHING DURING THIS TIME EXCEPT TO SELECT 30.51 ON OUR ALTIMETERS, A 20 FT DIFFERENCE, AND RECYCLE OUR XPONDER.

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.