B747-200 flight crew reported to ATC moderate turbulence causing them to not be able to maintain assigned altitudes of 5000 ft and 17000 ft during departure climb. Therefore, they requested block altitudes until out of it.

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Attributes
ACN	533835
Time
Date	200112
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	intersection : gayel
State Reference	NY
Altitude	msl bound lower : 5000 msl bound upper : 17000
Environment
Flight Conditions	IMC
Weather Elements	Rain Turbulence
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90.tracon tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	B747-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 15000 flight time type : 5000
ASRS Report	533835
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp pilot : cfi
ASRS Report	533766
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : altimeter other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude none taken : unable
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Weather

Narrative:

After takeoff on runway 22R and during climb out, we encountered moderate turbulence with light rain showers. The turbulence made it difficult to maintain the assigned altitude both at 5000 ft and 17000 ft, and resulted in altdevs of 300 ft above the assigned altitudes. ATC was informed about the turbulence, followed by the deviation, and we immediately asked for block altitudes.

Original NASA ASRS Text

Title: B747-200 FLC RPTED TO ATC MODERATE TURB CAUSING THEM TO NOT BE ABLE TO MAINTAIN ASSIGNED ALTS OF 5000 FT AND 17000 FT DURING DEP CLB. THEREFORE, THEY REQUESTED BLOCK ALTS UNTIL OUT OF IT.

Narrative: AFTER TKOF ON RWY 22R AND DURING CLBOUT, WE ENCOUNTERED MODERATE TURB WITH LIGHT RAIN SHOWERS. THE TURB MADE IT DIFFICULT TO MAINTAIN THE ASSIGNED ALT BOTH AT 5000 FT AND 17000 FT, AND RESULTED IN ALTDEVS OF 300 FT ABOVE THE ASSIGNED ALTS. ATC WAS INFORMED ABOUT THE TURB, FOLLOWED BY THE DEV, AND WE IMMEDIATELY ASKED FOR BLOCK ALTS.

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.