<< >> NASA ASRS Report 424460, December 1998

An air carrier B767 flight crew descends on a STAR below the proper altitude when they misset their altimeters.

Attributes
ACN	424460
Time
Date	199812
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mod
State Reference	CA
Altitude	msl bound lower : 18000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 185 flight time total : 8000 flight time type : 750
ASRS Report	424460
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 12100 flight time type : 3900
ASRS Report	424456
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

While descending on the modesto 2 arrival for the FMS bridge visual to runway 28R at sfo, our flight misunderstood the local altimeter setting. This resulted in the descent and approach being flown slightly below the depicted at or above altitudes on the approach until GS intercept.

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Original NASA ASRS Text

Title: AN ACR B767 FLC DSNDS ON A STAR BELOW THE PROPER ALT WHEN THEY MISSET THEIR ALTIMETERS.

Narrative: WHILE DSNDING ON THE MODESTO 2 ARR FOR THE FMS BRIDGE VISUAL TO RWY 28R AT SFO, OUR FLT MISUNDERSTOOD THE LCL ALTIMETER SETTING. THIS RESULTED IN THE DSCNT AND APCH BEING FLOWN SLIGHTLY BELOW THE DEPICTED AT OR ABOVE ALTS ON THE APCH UNTIL GS INTERCEPT.

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.