A line avionics mechanic is informed the B757-200 write up he signed off for a leading edge slat dis...

Attributes
ACN	816114
Time
Date	200810
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	816114
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : slat disagree
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals contributing factor : briefing performance deficiency : testing performance deficiency : fault isolation
Supplementary
Problem Areas	Chart Or Publication Aircraft
Primary Problem	Chart Or Publication

Narrative:

Inbound write-up: leading edge slat disagreement light and EICAS warning when flaps selected degree. Action: accomplished system bite and reset. Leading edge slat and flap system ground operation check normal with flap cycling several times from 0-30 degrees. Get additional help with the troubleshooting of the problem and more time to work to work problem. Shortage of manpower; troubleshooting alone. Callback conversation with reporter revealed the following information: reporter stated the B757-200 pilot's inbound squawk for the leading edge disagree light and EICAS warning when flap positions were selected were the only details. He is an avionics mechanic and followed the fault isolation manual (fim) procedures; performed a bite test on the flap system black boxes; cycled the leading and trailing edge slats and flaps several times without any disagree light or other EICAS warning. Reporter stated the same disagree warning appeared again; when the aircraft was on approach going into the next station. Reporter stated he believes a mechanic at that station found one of the slat or flap drive load relief fuses on one of the units had popped and caused the slat disagree light.

Original NASA ASRS Text

Title: A LINE AVIONICS MECHANIC IS INFORMED THE B757-200 WRITE UP HE SIGNED OFF FOR A LEADING EDGE SLAT DISAGREE LIGHT AND EICAS WARNING WHEN FLAP POSITIONS SELECTED; HAD REOCCURRED AT THE NEXT ARRIVAL STATION.

Narrative: INBOUND WRITE-UP: LEADING EDGE SLAT DISAGREEMENT LIGHT AND EICAS WARNING WHEN FLAPS SELECTED DEGREE. ACTION: ACCOMPLISHED SYSTEM BITE AND RESET. LEADING EDGE SLAT AND FLAP SYSTEM GND OP CHK NORMAL WITH FLAP CYCLING SEVERAL TIMES FROM 0-30 DEGS. GET ADDITIONAL HELP WITH THE TROUBLESHOOTING OF THE PROB AND MORE TIME TO WORK TO WORK PROB. SHORTAGE OF MANPOWER; TROUBLESHOOTING ALONE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE B757-200 PILOT'S INBOUND SQUAWK FOR THE LEADING EDGE DISAGREE LIGHT AND EICAS WARNING WHEN FLAP POSITIONS WERE SELECTED WERE THE ONLY DETAILS. HE IS AN AVIONICS MECHANIC AND FOLLOWED THE FAULT ISOLATION MANUAL (FIM) PROCEDURES; PERFORMED A BITE TEST ON THE FLAP SYSTEM BLACK BOXES; CYCLED THE LEADING AND TRAILING EDGE SLATS AND FLAPS SEVERAL TIMES WITHOUT ANY DISAGREE LIGHT OR OTHER EICAS WARNING. REPORTER STATED THE SAME DISAGREE WARNING APPEARED AGAIN; WHEN THE AIRCRAFT WAS ON APPROACH GOING INTO THE NEXT STATION. REPORTER STATED HE BELIEVES A MECHANIC AT THAT STATION FOUND ONE OF THE SLAT OR FLAP DRIVE LOAD RELIEF FUSES ON ONE OF THE UNITS HAD POPPED AND CAUSED THE SLAT DISAGREE LIGHT.

Data retrieved from NASA's ASRS site as of May 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.

A line avionics mechanic is informed the B757-200 write up he signed off for a leading edge slat disagree light and EICAS warning when flap positions selected; had reoccurred at the next arrival station.