Flight crew of an medium large transport took evasive action after observing a cessna 120 they were overtaking when descending from an overcast. Near midair collision.

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Attributes
ACN	283142
Time
Date	199409
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : anc
State Reference	AK
Altitude	msl bound lower : 5000 msl bound upper : 5100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : anc tracon : bdl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna 120
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 5200 flight time type : 1200
ASRS Report	283142
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 200
ASRS Report	283143
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 75 vertical : 75
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

On descent into anc area broke through cloud layer at 5000 ft. Immediately noticed yellow cessna 120/140 eastbound at 2 O'clock descending rapidly 100 ft away. Pulled up and applied power to evade. Asked ATC about traffic in our location. ATC said they had intermittent weak target 4 mi behind, no altitude information and track was roughly eastbound (if a track could be determined).

Original NASA ASRS Text

Title: FLC OF AN MLG TOOK EVASIVE ACTION AFTER OBSERVING A CESSNA 120 THEY WERE OVERTAKING WHEN DSNDING FROM AN OVCST. NMAC.

Narrative: ON DSCNT INTO ANC AREA BROKE THROUGH CLOUD LAYER AT 5000 FT. IMMEDIATELY NOTICED YELLOW CESSNA 120/140 EBOUND AT 2 O'CLOCK DSNDING RAPIDLY 100 FT AWAY. PULLED UP AND APPLIED PWR TO EVADE. ASKED ATC ABOUT TFC IN OUR LOCATION. ATC SAID THEY HAD INTERMITTENT WEAK TARGET 4 MI BEHIND, NO ALT INFO AND TRACK WAS ROUGHLY EBOUND (IF A TRACK COULD BE DETERMINED).

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.