False altitude deviation reading instigated by aircraft equipment problem a malfunctioning altimeter...

Attributes
ACN	206273
Time
Date	199204
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gso
State Reference	NC
Altitude	msl bound lower : 9000 msl bound upper : 9700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gso
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 12000 flight time type : 5600
ASRS Report	206273
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	aircraft : equipment problem dissipated
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Takeoff gso, level off 9000 -- ATC showed 9700 MSL -- captain's altimeter about this time rolled back 800 ft -- first officer's 9000 ft (flying pilot) -- mode C reports on #1 altimeter. Altimeter written up at destination. Remainder of flight worked normally.

Original NASA ASRS Text

Title: FALSE ALTDEV READING INSTIGATED BY ACFT EQUIP PROBLEM A MALFUNCTIONING ALTIMETER.

Narrative: TKOF GSO, LEVEL OFF 9000 -- ATC SHOWED 9700 MSL -- CAPT'S ALTIMETER ABOUT THIS TIME ROLLED BACK 800 FT -- FO'S 9000 FT (FLYING PLT) -- MODE C RPTS ON #1 ALTIMETER. ALTIMETER WRITTEN UP AT DEST. REMAINDER OF FLT WORKED NORMALLY.

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.