<< >> NASA ASRS Report 354440, November 1996

Possible altitude deviation altitude undershot in descent. Altitude crossing restr not met. Non adherence to ATC clearance instruction.

Attributes
ACN	354440
Time
Date	199611
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : aml
State Reference	VA
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc tower : sbn
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
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 pilot : commercial pilot : flight engineer pilot : instrument pilot : private
Experience	flight time last 90 days : 170 flight time total : 7000 flight time type : 2000
ASRS Report	354440
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Operational Deviation other

Narrative:

I read back crossing restr on descent of 65 NM south of aml. After the captain set up the FMS, I checked the distance and the captain had set up 55 NM. By the time I discovered this it was too late to make the 65 DME restr. However, the captain still thought the crossing restr was 55 NM, which we made. Due to ATC congestion, I was unable to clarify with ATC.

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Original NASA ASRS Text

Title: POSSIBLE ALTDEV ALT UNDERSHOT IN DSCNT. ALT XING RESTR NOT MET. NON ADHERENCE TO ATC CLRNC INSTRUCTION.

Narrative: I READ BACK XING RESTR ON DSCNT OF 65 NM S OF AML. AFTER THE CAPT SET UP THE FMS, I CHKED THE DISTANCE AND THE CAPT HAD SET UP 55 NM. BY THE TIME I DISCOVERED THIS IT WAS TOO LATE TO MAKE THE 65 DME RESTR. HOWEVER, THE CAPT STILL THOUGHT THE XING RESTR WAS 55 NM, WHICH WE MADE. DUE TO ATC CONGESTION, I WAS UNABLE TO CLARIFY WITH ATC.

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.