C208TF pilot felt aircraft vibrate causing loss of control during turn to final for landing and subsequently after applying full power regained control and made hard landing on the snow covered runway in alaska. Cabin rear doors were observed open after landing. No injuries or aircraft damage.

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Attributes
ACN	540409
Time
Date	200203
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : puviaq
State Reference	AK
Environment
Flight Conditions	VMC
Weather Elements	Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mco.tower
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 22000 flight time type : 2500
ASRS Report	540409
Person 2
Affiliation	other
Function	observation : passenger
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : acft vibration other flight crewa
Resolutory Action	flight crew : landed in emergency condition flight crew : regained aircraft control
Consequence	faa : investigated other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Company
Primary Problem	Aircraft

Narrative:

While overhead puviaq, camp 21, I was maneuvering for landing. I had passed over strip, was 1 mi past 600 ft AGL, starting a 180 degree turn. Felt a strong vibration 2/3 of the way through the turn. I initiated full power, wings level recovery, tail continued to shake a few seconds. Later, I was sliding on the snow. When we stopped, I noticed the right rear upper and lower door were open. Also, the left rear upper door was open. I suspect one of these doors may have opened during flight. I consider this a hard landing. The ELT never went off. No passenger were hurt. Aircraft wing and tail fuselage, no structural damage. ELT never went off. I had 5-6 causes of eggs on board, did not break a one. 4 passenger, 1 pilot. Everyone walked away. No one was hurt. I consider this a not-so-hard landing incident. Airspeed was between 110-125 KTS. I suspect that one of the rear doors might have opened part way and blocked flow over tail. Upon slide out on snow, aircraft stopped. 3 rear doors opened, right rear upper and lower left door upper.

Original NASA ASRS Text

Title: C208TF PLT FELT ACFT VIBRATE CAUSING LOSS OF CTL DURING TURN TO FINAL FOR LNDG AND SUBSEQUENTLY AFTER APPLYING FULL PWR REGAINED CTL AND MADE HARD LNDG ON THE SNOW COVERED RWY IN ALASKA. CABIN REAR DOORS WERE OBSERVED OPEN AFTER LNDG. NO INJURIES OR ACFT DAMAGE.

Narrative: WHILE OVERHEAD PUVIAQ, CAMP 21, I WAS MANEUVERING FOR LNDG. I HAD PASSED OVER STRIP, WAS 1 MI PAST 600 FT AGL, STARTING A 180 DEG TURN. FELT A STRONG VIBRATION 2/3 OF THE WAY THROUGH THE TURN. I INITIATED FULL PWR, WINGS LEVEL RECOVERY, TAIL CONTINUED TO SHAKE A FEW SECONDS. LATER, I WAS SLIDING ON THE SNOW. WHEN WE STOPPED, I NOTICED THE R REAR UPPER AND LOWER DOOR WERE OPEN. ALSO, THE L REAR UPPER DOOR WAS OPEN. I SUSPECT ONE OF THESE DOORS MAY HAVE OPENED DURING FLT. I CONSIDER THIS A HARD LNDG. THE ELT NEVER WENT OFF. NO PAX WERE HURT. ACFT WING AND TAIL FUSELAGE, NO STRUCTURAL DAMAGE. ELT NEVER WENT OFF. I HAD 5-6 CAUSES OF EGGS ON BOARD, DID NOT BREAK A ONE. 4 PAX, 1 PLT. EVERYONE WALKED AWAY. NO ONE WAS HURT. I CONSIDER THIS A NOT-SO-HARD LNDG INCIDENT. AIRSPD WAS BTWN 110-125 KTS. I SUSPECT THAT ONE OF THE REAR DOORS MIGHT HAVE OPENED PART WAY AND BLOCKED FLOW OVER TAIL. UPON SLIDE OUT ON SNOW, ACFT STOPPED. 3 REAR DOORS OPENED, R REAR UPPER AND LOWER L DOOR UPPER.

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.