<< >> NASA ASRS Report 563596, October 2002

An altitude deviation creates a near loss of traffic separation between a CE551 single pilot ferry operation and an air carrier flight on frequency with ZTL, GA.

Attributes
ACN	563596
Time
Date	200210
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ztl.artcc
State Reference	GA
Altitude	msl bound lower : 19000 msl bound upper : 19300
Environment
Flight Conditions	IMC
Weather Elements	Ice Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc tower : sjc.tower
Operator	general aviation : personal
Make Model Name	Citation II/SP
Operating Under FAR Part	Part 91
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 17800 flight time type : 2500
ASRS Report	563596
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence other other anomaly
Independent Detector	atc equipment other atc equipment : radar mode c other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : regained aircraft control flight crew : returned to assigned altitude other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 30000 vertical : 800
Supplementary
Problem Areas	Aircraft Weather ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

I was cleared to climb and maintain FL190. After reaching said altitude, I encountered moderate ice and turbulence. The autoplt disengaged and the aircraft suddenly ascended rapidly. I manually stopped the climb and recovered, not gaining over 200 ft according to my altimeter. I continued to experience ice and turbulence while struggling to maintain altitude. ZTL was asked by me for a higher altitude due to ice. After 2 controller changes and a period of time, I was cleared to FL230 and eventually to FL270. The flight was continued to my destination of gso without further incident. I contributed the increase in altitude due to turbulence and ice in the area. Had I been cleared to climb, the incident would have not occurred. I did not know of an altitude problem until I called ATC.

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Original NASA ASRS Text

Title: AN ALTDEV CREATES A NEAR LOSS OF TFC SEPARATION BTWN A CE551 SINGLE PLT FERRY OP AND AN ACR FLT ON FREQ WITH ZTL, GA.

Narrative: I WAS CLRED TO CLB AND MAINTAIN FL190. AFTER REACHING SAID ALT, I ENCOUNTERED MODERATE ICE AND TURB. THE AUTOPLT DISENGAGED AND THE ACFT SUDDENLY ASCENDED RAPIDLY. I MANUALLY STOPPED THE CLB AND RECOVERED, NOT GAINING OVER 200 FT ACCORDING TO MY ALTIMETER. I CONTINUED TO EXPERIENCE ICE AND TURB WHILE STRUGGLING TO MAINTAIN ALT. ZTL WAS ASKED BY ME FOR A HIGHER ALT DUE TO ICE. AFTER 2 CTLR CHANGES AND A PERIOD OF TIME, I WAS CLRED TO FL230 AND EVENTUALLY TO FL270. THE FLT WAS CONTINUED TO MY DEST OF GSO WITHOUT FURTHER INCIDENT. I CONTRIBUTED THE INCREASE IN ALT DUE TO TURB AND ICE IN THE AREA. HAD I BEEN CLRED TO CLB, THE INCIDENT WOULD HAVE NOT OCCURRED. I DID NOT KNOW OF AN ALT PROB UNTIL I CALLED 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.