A part 135 pilot, giving training to a new pilot, reported that he was unable to hold his assigned altitude, so he belatedly requested an altitude block.

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Attributes
ACN	510070
Time
Date	200105
Day	Fri
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Aircraft 1
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 60 flight time total : 3800 flight time type : 4000
ASRS Report	510070
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance non adherence : far
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Trainee on board, flying. Altitude problem was evident. Solution: we were able to get a block altitude 9000-10000 ft and went to 9500 ft. We were able to stay between 9000-10000 ft. Contributing to the problem was turbulence and altimeter changes of more than .1 inch with the change of each controller.

Original NASA ASRS Text

Title: A PART 135 PLT, GIVING TRAINING TO A NEW PLT, RPTED THAT HE WAS UNABLE TO HOLD HIS ASSIGNED ALT, SO HE BELATEDLY REQUESTED AN ALT BLOCK.

Narrative: TRAINEE ON BOARD, FLYING. ALT PROB WAS EVIDENT. SOLUTION: WE WERE ABLE TO GET A BLOCK ALT 9000-10000 FT AND WENT TO 9500 FT. WE WERE ABLE TO STAY BTWN 9000-10000 FT. CONTRIBUTING TO THE PROB WAS TURB AND ALTIMETER CHANGES OF MORE THAN .1 INCH WITH THE CHANGE OF EACH CTLR.

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.