C210 pilot suspects he may have violated bur class C airspace due to a faulty altimeter.

Attributes
ACN	352500
Time
Date	199611
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bur airport : whp
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bur tower : iad
Operator	general aviation : personal
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C, 210D
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 25 flight time total : 2280 flight time type : 1489
ASRS Report	352500
Events
Anomaly	other anomaly other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I departed whiteman airport northwest then right turn following VFR corridor east along the burbank class C airspace. I believe I was clear of the airspace but during the remainder of the trip back to scottsdale via twenty nine palms, I came to suspect my altimeter is not reporting the correct altitude. As far as I know there were no other aircraft in my vicinity and no hazard developed. Earlier (2 days) luke AFB approach control read my altitude 150 ft lower than my altimeter but when I was with ZLA their readout was very close to my altimeter reading. My corrective action is have my altimeter tested and fixed if necessary. To be safer one should always be in touch immediately with departure control when anywhere near controled airspace.

Original NASA ASRS Text

Title: C210 PLT SUSPECTS HE MAY HAVE VIOLATED BUR CLASS C AIRSPACE DUE TO A FAULTY ALTIMETER.

Narrative: I DEPARTED WHITEMAN ARPT NW THEN R TURN FOLLOWING VFR CORRIDOR E ALONG THE BURBANK CLASS C AIRSPACE. I BELIEVE I WAS CLR OF THE AIRSPACE BUT DURING THE REMAINDER OF THE TRIP BACK TO SCOTTSDALE VIA TWENTY NINE PALMS, I CAME TO SUSPECT MY ALTIMETER IS NOT RPTING THE CORRECT ALT. AS FAR AS I KNOW THERE WERE NO OTHER ACFT IN MY VICINITY AND NO HAZARD DEVELOPED. EARLIER (2 DAYS) LUKE AFB APCH CTL READ MY ALT 150 FT LOWER THAN MY ALTIMETER BUT WHEN I WAS WITH ZLA THEIR READOUT WAS VERY CLOSE TO MY ALTIMETER READING. MY CORRECTIVE ACTION IS HAVE MY ALTIMETER TESTED AND FIXED IF NECESSARY. TO BE SAFER ONE SHOULD ALWAYS BE IN TOUCH IMMEDIATELY WITH DEP CTL WHEN ANYWHERE NEAR CTLED AIRSPACE.

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.