<< >> NASA ASRS Report 202456, February 1992

Medium large transport flight crew crew resets altim electronic mode passing FL180 but does not confirm change. Altitude deviation.

Attributes
ACN	202456
Time
Date	199202
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : avp
State Reference	PA
Altitude	msl bound lower : 12000 msl bound upper : 12450
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 10000 flight time type : 150
ASRS Report	202456
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flying medium large transport aircraft. Changes in altimeter setting accomplished by push button which changes reference from standard (2992) to qnh. Cleared from FL180 to 12000 MSL. Leaving FL180 I pushed the altimeter button to reference altimeter to preset qnh value of 30.38. Shortly after level off at 12000 other pilot noted we were about 450 ft high (ie, 12450 ft vice 12000). I looked at my display and saw my altimeter was still set to standard (29.92). I pushed my altimeter button again, got the qnh value and immediately descended to the correct altitude (12000 MSL). Although I remember pushing the button out of FL180 I did not visually verify that the altimeter was in the qnh mode. Needless to say this will definitely be included in my scan from now on.

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Original NASA ASRS Text

Title: MLG FLC CREW RESETS ALTIM ELECTRONIC MODE PASSING FL180 BUT DOES NOT CONFIRM CHANGE. ALTDEV.

Narrative: FLYING MLG ACFT. CHANGES IN ALTIMETER SETTING ACCOMPLISHED BY PUSH BUTTON WHICH CHANGES REF FROM STD (2992) TO QNH. CLRED FROM FL180 TO 12000 MSL. LEAVING FL180 I PUSHED THE ALTIMETER BUTTON TO REF ALTIMETER TO PRESET QNH VALUE OF 30.38. SHORTLY AFTER LEVEL OFF AT 12000 OTHER PLT NOTED WE WERE ABOUT 450 FT HIGH (IE, 12450 FT VICE 12000). I LOOKED AT MY DISPLAY AND SAW MY ALTIMETER WAS STILL SET TO STD (29.92). I PUSHED MY ALTIMETER BUTTON AGAIN, GOT THE QNH VALUE AND IMMEDIATELY DSNDED TO THE CORRECT ALT (12000 MSL). ALTHOUGH I REMEMBER PUSHING THE BUTTON OUT OF FL180 I DID NOT VISUALLY VERIFY THAT THE ALTIMETER WAS IN THE QNH MODE. NEEDLESS TO SAY THIS WILL DEFINITELY BE INCLUDED IN MY SCAN FROM NOW ON.

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.