<< >> NASA ASRS Report 364626, April 1997

Iai-1124 aircraft in descent flight crew misheard altimeter setting and had altimeters set 1000 ft off. Approach controller alerted them that they were 1000 ft too low from cleared altitude, but the controller cleared them to remain at that altitude.

Attributes
ACN	364626
Time
Date	199704
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jfk
State Reference	NY
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : zny
Operator	general aviation : corporate
Make Model Name	IAI1124/1124A/Westwind
Operating Under FAR Part	Part 91
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 5200 flight time type : 650
ASRS Report	364626
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending from altitude we were assigned an altimeter setting of 30.33. The descent was not broken as we were handed off twice. Each controller continued our descent before reaching assigned altitude. Final assigned altitude was 4000 ft with ny approach. Radar showed us at 3000 ft, we requested the altimeter setting to realize it was 29.33, 1000 ft off. We corrected the altimeter, but were requested to remain at 3000 ft. No further problems. At no time was the altimeter setting restated. More diligence on both ATC to inform and the crew to acquire and question ATIS setting if vastly different.

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Original NASA ASRS Text

Title: IAI-1124 ACFT IN DSCNT FLC MISHEARD ALTIMETER SETTING AND HAD ALTIMETERS SET 1000 FT OFF. APCH CTLR ALERTED THEM THAT THEY WERE 1000 FT TOO LOW FROM CLRED ALT, BUT THE CTLR CLRED THEM TO REMAIN AT THAT ALT.

Narrative: DSNDING FROM ALT WE WERE ASSIGNED AN ALTIMETER SETTING OF 30.33. THE DSCNT WAS NOT BROKEN AS WE WERE HANDED OFF TWICE. EACH CTLR CONTINUED OUR DSCNT BEFORE REACHING ASSIGNED ALT. FINAL ASSIGNED ALT WAS 4000 FT WITH NY APCH. RADAR SHOWED US AT 3000 FT, WE REQUESTED THE ALTIMETER SETTING TO REALIZE IT WAS 29.33, 1000 FT OFF. WE CORRECTED THE ALTIMETER, BUT WERE REQUESTED TO REMAIN AT 3000 FT. NO FURTHER PROBS. AT NO TIME WAS THE ALTIMETER SETTING RESTATED. MORE DILIGENCE ON BOTH ATC TO INFORM AND THE CREW TO ACQUIRE AND QUESTION ATIS SETTING IF VASTLY DIFFERENT.

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.