A embraer 120 in cruise at FL200 ft has flap control circuit breaker trip with no reset caused by a shorted wire in the flap control circuit.

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Attributes
ACN	481107
Time
Date	200008
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	LA
Altitude	msl single value : 2000
Environment
Flight Conditions	Mixed
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 120 flight time total : 2450 flight time type : 1150
ASRS Report	481107
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : flap position indication other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : non compliance with legal requirements performance deficiency : repair performance deficiency : unqualified personnel
Supplementary
Problem Areas	Aircraft Environmental Factor Maintenance Human Performance Company
Primary Problem	Maintenance Human Performance

Narrative:

Flap control unit fault occurred in cruise. This was a regular occurence on aircraft wxxx. After landing in abc with zero flaps, the fault reset. I did not write the flaps up because it reset on the ground. During cruise on the way back to ZZZ, the same thing happened. I wrote the aircraft up in ZZZ. This was the 11TH write up on the flaps in 6 days. Callback conversation with reporter revealed the following information: the reporter stated the flap problem was corrected when the aircraft was taken out of service for several days and a positive fix accomplished. The reporter said a wire in the flap control circuit was found shorting to the structure. The reporter said the embraer 120 fleet are aging aircraft and the wiring is deteriorating causing abnormal amount of flap trouble.

Original NASA ASRS Text

Title: A EMBRAER 120 IN CRUISE AT FL200 FT HAS FLAP CTL CIRCUIT BREAKER TRIP WITH NO RESET CAUSED BY A SHORTED WIRE IN THE FLAP CTL CIRCUIT.

Narrative: FLAP CTL UNIT FAULT OCCURRED IN CRUISE. THIS WAS A REGULAR OCCURENCE ON ACFT WXXX. AFTER LNDG IN ABC WITH ZERO FLAPS, THE FAULT RESET. I DID NOT WRITE THE FLAPS UP BECAUSE IT RESET ON THE GND. DURING CRUISE ON THE WAY BACK TO ZZZ, THE SAME THING HAPPENED. I WROTE THE ACFT UP IN ZZZ. THIS WAS THE 11TH WRITE UP ON THE FLAPS IN 6 DAYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FLAP PROBLEM WAS CORRECTED WHEN THE ACFT WAS TAKEN OUT OF SERVICE FOR SEVERAL DAYS AND A POSITIVE FIX ACCOMPLISHED. THE RPTR SAID A WIRE IN THE FLAP CTL CIRCUIT WAS FOUND SHORTING TO THE STRUCTURE. THE RPTR SAID THE EMBRAER 120 FLEET ARE AGING ACFT AND THE WIRING IS DETERIORATING CAUSING ABNORMAL AMOUNT OF FLAP TROUBLE.

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.