<< >> NASA ASRS Report 383590, October 1997

Flight crew of medium large transport has altimeter stick during climb. They do not notice until the altitude alert activates.

Attributes
ACN	383590
Time
Date	199710
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bos
State Reference	MA
Altitude	msl bound lower : 22000 msl bound upper : 22400
Environment
Flight Conditions	Mixed
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zbw tracon : abi
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 32 flight time total : 7000 flight time type : 3000
ASRS Report	383590
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing to FL220 out of boston, ma, en route to trenton, nj, sometime after passing through FL210 my altimeter stuck. The altitude alerter sounded at approximately FL223 and an altitude of approximately FL224 was obtained before returning to FL220. About the time the altitude alerter sounded my altimeter caught up with the first officer's altimeter and functioned normally. The altimeter was written up and replaced. No other aircraft were visible nor depicted on our TCASII. ATC made no mention to us about the incident.

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Original NASA ASRS Text

Title: FLC OF MLG HAS ALTIMETER STICK DURING CLB. THEY DO NOT NOTICE UNTIL THE ALT ALERT ACTIVATES.

Narrative: CLBING TO FL220 OUT OF BOSTON, MA, ENRTE TO TRENTON, NJ, SOMETIME AFTER PASSING THROUGH FL210 MY ALTIMETER STUCK. THE ALT ALERTER SOUNDED AT APPROX FL223 AND AN ALT OF APPROX FL224 WAS OBTAINED BEFORE RETURNING TO FL220. ABOUT THE TIME THE ALT ALERTER SOUNDED MY ALTIMETER CAUGHT UP WITH THE FO'S ALTIMETER AND FUNCTIONED NORMALLY. THE ALTIMETER WAS WRITTEN UP AND REPLACED. NO OTHER ACFT WERE VISIBLE NOR DEPICTED ON OUR TCASII. ATC MADE NO MENTION TO US ABOUT THE INCIDENT.

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.