DO328 flew into and through layer of cumulus clouds resulting in moderate to severe turbulence causing the autoplt to disengage and an altitude gain of 300 ft.

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Attributes
ACN	542274
Time
Date	200203
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : avp.tracon
State Reference	PA
Altitude	msl single value : 8000
Environment
Flight Conditions	IMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : avp.tracon
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : v116.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 135 flight time total : 3100 flight time type : 2000
ASRS Report	542274
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Weather

Narrative:

Cruise flight on victor airway. A broken layer of cumulous clouds was forming at our altitude of 8000 ft MSL. Captain was PNF, receiving ATIS on communication #2 and copying, while first officer was PF, autoplt on. A cumulus buildup was in flight path on airway. First officer did not deviate around buildup. Upon entering cloud, moderate to severe turbulence, knocked off the autoplt. First officer took control of aircraft and while hand flying in the moderate to severe turbulence, with updrafts, aircraft deviated between 280-300 ft high of assigned altitude. Captain was distraction and unaware of the imminent penetration of buildup. Once the climb was recognized, captain assisted with forward pressure on the yoke to arrest the climb rate. Perception: captain perceived experience in young, inexperienced first officer. Inaction: first officer's decision not to deviate or slow aircraft. Increased vigilance by crew during nonstandard flight sits and high workload environments could prevent recurrence of such events.

Original NASA ASRS Text

Title: DO328 FLEW INTO AND THROUGH LAYER OF CUMULUS CLOUDS RESULTING IN MODERATE TO SEVERE TURB CAUSING THE AUTOPLT TO DISENGAGE AND AN ALT GAIN OF 300 FT.

Narrative: CRUISE FLT ON VICTOR AIRWAY. A BROKEN LAYER OF CUMULOUS CLOUDS WAS FORMING AT OUR ALT OF 8000 FT MSL. CAPT WAS PNF, RECEIVING ATIS ON COM #2 AND COPYING, WHILE FO WAS PF, AUTOPLT ON. A CUMULUS BUILDUP WAS IN FLT PATH ON AIRWAY. FO DID NOT DEVIATE AROUND BUILDUP. UPON ENTERING CLOUD, MODERATE TO SEVERE TURB, KNOCKED OFF THE AUTOPLT. FO TOOK CTL OF ACFT AND WHILE HAND FLYING IN THE MODERATE TO SEVERE TURB, WITH UPDRAFTS, ACFT DEVIATED BTWN 280-300 FT HIGH OF ASSIGNED ALT. CAPT WAS DISTR AND UNAWARE OF THE IMMINENT PENETRATION OF BUILDUP. ONCE THE CLB WAS RECOGNIZED, CAPT ASSISTED WITH FORWARD PRESSURE ON THE YOKE TO ARREST THE CLB RATE. PERCEPTION: CAPT PERCEIVED EXPERIENCE IN YOUNG, INEXPERIENCED FO. INACTION: FO'S DECISION NOT TO DEVIATE OR SLOW ACFT. INCREASED VIGILANCE BY CREW DURING NONSTANDARD FLT SITS AND HIGH WORKLOAD ENVIRONMENTS COULD PREVENT RECURRENCE OF SUCH EVENTS.

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.