<< >> NASA ASRS Report 408510, July 1998

ARTCC controller descends BE36 from 10000 ft to 9000 ft. Pilot descends below assigned altitude and conflicts with climbing E120. ZNY quality assurance conflict patch alerts of separation loss.

Attributes
ACN	408510
Time
Date	199807
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : har
State Reference	PA
Altitude	msl bound lower : 8000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	general aviation : personal
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : instrument
Experience	controller non radar : 15 flight time total : 318
ASRS Report	408510
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

BE36 bonanza checked on my frequency level at 10000 ft. BE36 was issued current altimeter setting at harrisburg, and was issued a clearance to descend to 9000 ft. BE36 reads back 9000 ft over harrisburg VORTAC, BE36 was observed below his assigned altitude. Pilot was queried to verify at 9000 ft and stated that he was cleared to 8000 ft. BE36 was told to climb to 9000 ft and was advised his assigned altitude was 9000 ft. Loss of separation with E120 over harrisburg at 8000 ft. E120 pilot took evasive action. BE36 pilot did not see E120 traffic. Loss of separation detected by ZNY quality assurance patch.

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Original NASA ASRS Text

Title: ARTCC CTLR DSNDS BE36 FROM 10000 FT TO 9000 FT. PLT DSNDS BELOW ASSIGNED ALT AND CONFLICTS WITH CLBING E120. ZNY QUALITY ASSURANCE CONFLICT PATCH ALERTS OF SEPARATION LOSS.

Narrative: BE36 BONANZA CHKED ON MY FREQ LEVEL AT 10000 FT. BE36 WAS ISSUED CURRENT ALTIMETER SETTING AT HARRISBURG, AND WAS ISSUED A CLRNC TO DSND TO 9000 FT. BE36 READS BACK 9000 FT OVER HARRISBURG VORTAC, BE36 WAS OBSERVED BELOW HIS ASSIGNED ALT. PLT WAS QUERIED TO VERIFY AT 9000 FT AND STATED THAT HE WAS CLRED TO 8000 FT. BE36 WAS TOLD TO CLB TO 9000 FT AND WAS ADVISED HIS ASSIGNED ALT WAS 9000 FT. LOSS OF SEPARATION WITH E120 OVER HARRISBURG AT 8000 FT. E120 PLT TOOK EVASIVE ACTION. BE36 PLT DID NOT SEE E120 TFC. LOSS OF SEPARATION DETECTED BY ZNY QUALITY ASSURANCE PATCH.

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.