Widebody transport aircraft in cruise, hand flying deviated from assigned altitude by 300 ft causing another aircraft to receive a TCASII advisory.

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Attributes
ACN	385530
Time
Date	199711
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zbw
State Reference	MA
Altitude	msl bound lower : 27000 msl bound upper : 27300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12500 flight time type : 2000
ASRS Report	385530
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Captain was hand flying aircraft, was about 200-300 ft below assigned altitude when given a course change which required an entry to the GPS units. Altitude was overshot by 200-300 ft. Another aircraft in vicinity (FL280) received a TCASII warning. No visual contact made.

Original NASA ASRS Text

Title: WDB ACFT IN CRUISE, HAND FLYING DEVIATED FROM ASSIGNED ALT BY 300 FT CAUSING ANOTHER ACFT TO RECEIVE A TCASII ADVISORY.

Narrative: CAPT WAS HAND FLYING ACFT, WAS ABOUT 200-300 FT BELOW ASSIGNED ALT WHEN GIVEN A COURSE CHANGE WHICH REQUIRED AN ENTRY TO THE GPS UNITS. ALT WAS OVERSHOT BY 200-300 FT. ANOTHER ACFT IN VICINITY (FL280) RECEIVED A TCASII WARNING. NO VISUAL CONTACT MADE.

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.