Medium large transport overhot assigned altitude during climb.

Attributes
ACN	90490
Time
Date	198807
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dab
State Reference	FL
Altitude	msl bound lower : 13000 msl bound upper : 13500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 9000
ASRS Report	90490
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

After departing dab on ZJX, a clearance was received to intercept J53 from approximately 300 degree heading. While checking the hi chart I called out the aircraft passing through 13000', which was the clearance altitude on first officer's altimeter. After checking the captain's altimeters, I realized the captain's system was in error. The #1 altimeter was fluctuating as much as 2000' low and the #2 altimeter in corrected mode was also reading low. Captain initiated level off and selected standby on #2 altimeter. This altimeter reading then agreed with first officer altimeter. ATC reported mode C still reading less than 13000'. The altitude alert system was not activated. Aircraft was flown on to atl with captain altimeter in standby. Aircraft was written up and turned over to maintenance.

Original NASA ASRS Text

Title: MLG OVERHOT ASSIGNED ALT DURING CLIMB.

Narrative: AFTER DEPARTING DAB ON ZJX, A CLRNC WAS RECEIVED TO INTERCEPT J53 FROM APPROX 300 DEG HDG. WHILE CHKING THE HI CHART I CALLED OUT THE ACFT PASSING THROUGH 13000', WHICH WAS THE CLRNC ALT ON F/O'S ALTIMETER. AFTER CHKING THE CAPT'S ALTIMETERS, I REALIZED THE CAPT'S SYS WAS IN ERROR. THE #1 ALTIMETER WAS FLUCTUATING AS MUCH AS 2000' LOW AND THE #2 ALTIMETER IN CORRECTED MODE WAS ALSO READING LOW. CAPT INITIATED LEVEL OFF AND SELECTED STANDBY ON #2 ALTIMETER. THIS ALTIMETER READING THEN AGREED WITH F/O ALTIMETER. ATC RPTED MODE C STILL READING LESS THAN 13000'. THE ALT ALERT SYS WAS NOT ACTIVATED. ACFT WAS FLOWN ON TO ATL WITH CAPT ALTIMETER IN STANDBY. ACFT WAS WRITTEN UP AND TURNED OVER TO MAINT.

Data retrieved from NASA's ASRS site as of August 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.