First officer takes control from captain of an EMB120 during a visual approach to psg that becomes unstable. Instrument conditions are encountered followed by GPWS system activation.

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Attributes
ACN	658197
Time
Date	200504
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : psg.airport
State Reference	AK
Altitude	msl bound lower : 500 msl bound upper : 12500
Environment
Flight Conditions	Marginal
Aircraft 1
Controlling Facilities	artcc : zan.artcc
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	other ndb
Flight Phase	cruise : level cruise : enroute altitude change descent : approach
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 156 flight time total : 9940 flight time type : 48
ASRS Report	658197
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	inflight encounter : weather non adherence : far non adherence : published procedure other anomaly other spatial deviation
Independent Detector	aircraft equipment : gpws other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : diverted to another airport flight crew : regained aircraft control
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

I; as copilot; flew in EMB120 takeoff from wrangel; ak; to petersburg; ak. WX in psg reported 1000 ft X 5. We were in VFR flight plan. Approach to fredericks point NDB 372 fpn. We lost any visual contact with ground. Captain went down 500 ft and started turn. I called 'pull up; pull up' but he turned 180 degrees (looking better WX late sad). Flew for few seconds and completely lost our position. GPWS went off. Captain slammed power levers forward and we started climb. Airplane stayed in 45 degree bank. I called 'heading 320 degrees; heading 320 degrees.' looked at the captain; his right leg was paralyzed and moved very erratically. I called my airplane took heading 320 degrees; went lda outbound and I started talking to FSS sitka; 'close VFR plane' zan. At 12500 ft; picked up IFR clearance. Go to juneau. MSA in this area 11100 ft. Over torqued the engines. Maybe it is a good nighttime story but I don't sleep few days after this.

Original NASA ASRS Text

Title: FO TAKES CTL FROM CAPT OF AN EMB120 DURING A VISUAL APCH TO PSG THAT BECOMES UNSTABLE. INST CONDITIONS ARE ENCOUNTERED FOLLOWED BY GPWS SYS ACTIVATION.

Narrative: I; AS COPLT; FLEW IN EMB120 TKOF FROM WRANGEL; AK; TO PETERSBURG; AK. WX IN PSG RPTED 1000 FT X 5. WE WERE IN VFR FLT PLAN. APCH TO FREDERICKS POINT NDB 372 FPN. WE LOST ANY VISUAL CONTACT WITH GND. CAPT WENT DOWN 500 FT AND STARTED TURN. I CALLED 'PULL UP; PULL UP' BUT HE TURNED 180 DEGS (LOOKING BETTER WX LATE SAD). FLEW FOR FEW SECONDS AND COMPLETELY LOST OUR POS. GPWS WENT OFF. CAPT SLAMMED PWR LEVERS FORWARD AND WE STARTED CLB. AIRPLANE STAYED IN 45 DEG BANK. I CALLED 'HDG 320 DEGS; HDG 320 DEGS.' LOOKED AT THE CAPT; HIS R LEG WAS PARALYZED AND MOVED VERY ERRATICALLY. I CALLED MY AIRPLANE TOOK HDG 320 DEGS; WENT LDA OUTBOUND AND I STARTED TALKING TO FSS SITKA; 'CLOSE VFR PLANE' ZAN. AT 12500 FT; PICKED UP IFR CLRNC. GO TO JUNEAU. MSA IN THIS AREA 11100 FT. OVER TORQUED THE ENGS. MAYBE IT IS A GOOD NIGHTTIME STORY BUT I DON'T SLEEP FEW DAYS AFTER THIS.

Data retrieved from NASA's ASRS site as of January 2009 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.