Pilot allows aircraft to climb 600 ft in updraft.

Attributes
ACN	312020
Time
Date	199508
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : abe
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 10600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 215 flight time total : 2850 flight time type : 850
ASRS Report	317020
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : exited adverse environment flight crew : regained aircraft control
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While at cruise at altitude as PNF I noted to PIC altitude was approaching 300 ft off assigned. PIC responded 'strong updraft.' ATC notified us of deviation of more than 300 ft, I gave the radio to PIC to respond. He asked for block altitude but did not receive one prior to altitude deviation. The aircraft was at 10600 ft (600 ft high) for a short time.

Original NASA ASRS Text

Title: PLT ALLOWS ACFT TO CLB 600 FT IN UPDRAFT.

Narrative: WHILE AT CRUISE AT ALT AS PNF I NOTED TO PIC ALT WAS APCHING 300 FT OFF ASSIGNED. PIC RESPONDED 'STRONG UPDRAFT.' ATC NOTIFIED US OF DEV OF MORE THAN 300 FT, I GAVE THE RADIO TO PIC TO RESPOND. HE ASKED FOR BLOCK ALT BUT DID NOT RECEIVE ONE PRIOR TO ALT DEV. THE ACFT WAS AT 10600 FT (600 FT HIGH) FOR A SHORT TIME.

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.